COMPOUND AND ORGANIC ELECTRONIC DEVICE USING THE SAME

Abstract

Provided are a novel compound and an organic electronic device using the same. The novel compound is represented by the following Formula (I):

##STR00001##

Claims

1. A compound represented by the following Formula (I): ##STR00236## wherein A is -L.sup.2-R.sup.a and B is -L.sup.3-R.sup.b, or A and B are joined together and bonded to the nitrogen atom in Formula (I) to form a substituted or unsubstituted N-carbazolyl group; L.sup.1, L.sup.2, and L.sup.3 are each independently a single bond or an arylene group having 6 to 60 ring carbon atoms; R.sup.a and R.sup.b are the same or different, and R.sup.a and R.sup.b are each independently selected from the group consisting of: Ar-Q, ##STR00237## Ar is an arylene group having 6 to 60 ring carbon atoms; Q is selected from the group consisting of: a hydrogen atom, a deuterium atom, and ##STR00238## Q.sup.1 and Q.sup.2 are the same or different, and Q.sup.1 and Q.sup.2 are each independently selected from the group consisting of: a substituted or unsubstituted aryl group having 6 to 60 ring carbon atoms, ##STR00239## m1, m2, m3, and m6 are each independently an integral of 0 to 4, and m4, m4, m7, and m7 are each independently an integral of 0 to 3; Z.sup.1 to Z.sup.4, Z.sup.4, Z.sup.6, Z.sup.7, and Z.sup.7 are each independently selected from the group consisting of: a deuterium atom, a trifluoromethyl group, a halogen group, a cyano group, a nitro group, an alkyl group having 1 to 40 carbon atoms, an alkenyl group having 2 to 40 carbon atoms, an alkynyl group having 2 to 40 carbon atoms, a cycloalkyl group having 3 to 60 ring carbon atoms, a heterocycloalkyl group having 3 to 60 ring carbon atoms, an aryl group having 6 to 60 ring carbon atoms, a heteroaryl group having 3 to 60 ring carbon atoms, an alkoxy group having 1 to 40 carbon atoms, an aryloxy group having 6 to 60 ring carbon atoms, an alkylsilyl group having 1 to 40 carbon atoms, an arylsilyl group having 6 to 60 ring carbon atoms, an alkylboron group having 1 to 40 carbon atoms, an arylboron group having 6 to 60 ring carbon atoms, a phosphine group having 1 to 40 carbon atoms, and a phosphine oxide group having 1 to 40 carbon atoms; Z.sup.5 and Z.sup.8 are each independently selected from the group consisting of: a hydrogen atom, a deuterium atom, an alkyl group having 1 to 40 carbon atoms, an alkenyl group having 2 to 40 carbon atoms, an alkynyl group having 2 to 40 carbon atoms, a cycloalkyl group having 3 to 60 ring carbon atoms, a heterocycloalkyl group having 3 to 60 ring carbon atoms, an aryl group having 6 to 60 ring carbon atoms, and a heteroaryl group having 3 to 60 ring carbon atoms.

2. The compound as claimed in claim 1, wherein the compound is represented by ##STR00240##

3. The compound as claimed in claim 1, wherein the compound is represented by ##STR00241## ##STR00242## ##STR00243## ##STR00244## ##STR00245## ##STR00246## ##STR00247## ##STR00248## ##STR00249## ##STR00250## ##STR00251##

4. The compound as claimed in claim 1, wherein the compound is represented by ##STR00252## wherein G.sup.1 and G.sup.2 are the same or different, and G.sup.1 and G.sup.2 are each independently selected from the group consisting of: a hydrogen atom, a deuterium atom, an alkyl group having 1 to 40 carbon atoms, an alkenyl group having 2 to 40 carbon atoms, an alkynyl group having 2 to 40 carbon atoms, a cycloalkyl group having 3 to 60 ring carbon atoms, a heterocycloalkyl group having 3 to 60 ring carbon atoms, an aryl group having 6 to 60 ring carbon atoms, and a heteroaryl group having 3 to 60 ring carbon atoms.

5. The compound as claimed in claim 1, wherein the compound is represented by ##STR00253##

6. The compound as claimed in claim 5, wherein Q.sup.1 and Q.sup.2 are each independently selected from the group consisting of: a substituted or unsubstituted phenyl group, a substituted or unsubstituted biphenylyl group, a substituted or unsubstituted terphenyl group, a substituted or unsubstituted naphthyl group, a substituted or unsubstituted phenanthryl group, a substituted or unsubstituted anthryl group, a substituted or unsubstituted benzanthryl group, a substituted or unsubstituted pyrenyl group, a substituted or unsubstituted fluorenyl group, and any deuterated analogs thereof.

7. The compound as claimed in claim 5, wherein Q.sup.1 and Q.sup.2 are each independently selected from the group consisting of: ##STR00254## ##STR00255##

8. The compound as claimed in claim 1, wherein R.sup.a and R.sup.b are each independently selected from the group consisting of: Ar-Q, ##STR00256## ##STR00257##

9. The compound as claimed in claim 1, wherein Ar-Q is selected from the group consisting of: ##STR00258## wherein Z.sup.11 and Z.sup.12 are each independently selected from the group consisting of: a hydrogen atom, a deuterium atom, a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group and a phenyl group.

10. The compound as claimed in claim 1, wherein L.sup.1, L.sup.2, and L.sup.3 are each independently selected from the group consisting of: a single bond, ##STR00259## ##STR00260## wherein Z.sup.9 and Z.sup.10 are each independently selected from the group consisting of: a hydrogen atom, a deuterium atom, a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group and a phenyl group.

11. The compound as claimed in claim 1, wherein Ar is selected from the group consisting of: ##STR00261## ##STR00262## wherein Z.sup.9 and Z.sup.10 are each independently selected from the group consisting of: a hydrogen atom, a deuterium atom, a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, a hexyl group and a phenyl group.

12. The compound as claimed in claim 1, wherein L.sup.1, L.sup.2, and L.sup.3 are the same.

13. The compound as claimed in claim 1, wherein the compound is selected from the group consisting of: ##STR00263## ##STR00264## ##STR00265## ##STR00266## ##STR00267## ##STR00268## ##STR00269## ##STR00270## ##STR00271## ##STR00272## ##STR00273## ##STR00274## ##STR00275## ##STR00276## ##STR00277##

14. An organic electronic device, comprising a first electrode, a second electrode, and an organic layer disposed between the first electrode and the second electrode, wherein the organic layer comprises the compound as claimed in claim 1.

15. The organic electronic device as claimed in claim 14, wherein the organic electronic device is an organic light emitting device.

16. The organic electronic device as claimed in claim 15, wherein the organic light emitting device comprises: a hole injection layer formed on the first electrode; a hole transport layer formed on the hole injection layer, wherein the organic layer is the hole transport layer; an emission layer formed on the hole transport layer; an electron transport layer formed on the emission layer, and an electron injection layer formed between the electron transport layer and the second electrode.

17. The organic electronic device as claimed in claim 15, wherein the organic light emitting device comprises: a hole injection layer formed on the first electrode, wherein the organic layer is the hole injection layer, a hole transport layer formed on the hole injection layer, an emission layer formed on the hole transport layer; an electron transport layer formed on the emission layer, and an electron injection layer formed between the electron transport layer and the second electrode.

18. The organic electronic device as claimed in claim 15, wherein the organic light emitting device comprises: a hole injection layer formed on the first electrode; a hole transport layer formed on the hole injection layer; an emission layer formed on the hole transport layer; an electron transport layer formed on the emission layer; and an electron injection layer formed between the electron transport layer and the second electrode; wherein the organic layer is the hole injection layer and the hole transport layer.

19. The organic electronic device as claimed in claim 15, wherein the organic light emitting device comprises: a hole injection layer formed on the first electrode; a hole transport layer formed on the hole injection layer, an electron blocking layer formed on the hole transport layer, wherein the organic layer is the electron blocking layer; an emission layer formed on the electron blocking layer, an electron transport layer formed on the emission layer; and an electron injection layer formed between the electron transport layer and the second electrode.

20. The organic electronic device as claimed in claim 14, wherein the compound is selected from the group consisting of: ##STR00278## ##STR00279## ##STR00280## ##STR00281## ##STR00282## ##STR00283## ##STR00284## ##STR00285## ##STR00286## ##STR00287## ##STR00288## ##STR00289## ##STR00290## ##STR00291## ##STR00292##

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0072] FIG. 1 illustrates a schematic cross-sectional view of an OLED.

[0073] FIGS. 2 to 44 are .sup.1H nuclear magnetic resonance (NMR) spectra of Compounds 1 to 43.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0074] Hereinafter, one skilled in the arts can easily realize the advantages and effects of a novel compound and an organic light emitting device using the same in accordance with the present invention from the following examples. It should be understood that the descriptions proposed herein are just preferable examples only for the purpose of illustrations, not intended to limit the scope of the invention. Various modifications and variations could be made in order to practice or apply the present invention without departing from the spirit and scope of the invention.

[0075] Preparation of Intermediate A

[0076] Intermediates A1 to A32 were adopted to synthesize the novel compound. Intermediates A1 to A32 could be purchased or synthesized by the following steps. Hereinafter, Intermediates A1 to A6, A9 to A14, A19 to A27 were purchased from Aldrich or Alfa, and their CAS No. were listed in Table 1. The other Intermediates A were synthesized by the following steps. The following syntheses are carried out, unless indicated otherwise, under a protected-gas atmosphere. The specific chemical structures of the Intermediates A1 to A32 were listed in Table 1.

TABLE-US-00001 TABLE 1 chemical structures and CAS No. of Intermediates A1 to A32. [00095] Intermediate A1 [00096] Intermediate A2 [00097] Intermediate A3 [00098] Intermediate A4 [00099] Intermediate A5 [00100] Intermediate A6 [00101] Intermediate A7 [00102] Intermediate A8 [00103] Intermediate A9 [00104] Intermediate A10 [00105] Intermediate A11 [00106] Intermediate A12 [00107] Intermediate A13 [00108] Intermediate A14 [00109] Intermediate A15 [00110] Intermediate A16 [00111] Intermediate A17 [00112] Intermediate A18 [00113] Intermediate A19 [00114] Intermediate A20 [00115] Intermediate A21 [00116] Intermediate A22 [00117] Intermediate A23 [00118] Intermediate A24 [00119] Intermediate A25 [00120] Intermediate A26 [00121] Intermediate A27 [00122] Intermediate A28 [00123] Intermediate A29 [00124] Intermediate A30 [00125] Intermediate A31 [00126] Intermediate A32

[0077] Synthesis of Intermediate A7

##STR00127##

[0078] Step 1:

[0079] A mixture of intermediate A1 (1.0 eq), bromobenzene (1.05 eq), Pd(OAc).sub.2 (0.005 eq), P(t-Bu).sub.3HBF.sub.4 (0.02 eq), and NaO.sup.tBu (1.5 eq) in toluene (0.3M) was heated at 80 C. for 8 h. After the completion of the reaction, the volatiles were removed under vacuum, and the resulting solution extracted with dichloromethane (360 mL). The combined organic extract was washed with brine solution, dried over Na.sub.2SO.sub.4, and concentrated to leave a yellow solid. Further, the crude product was purified by column chromatography on silica gel to give Intermediate A7-1 with white solid.

[0080] Step 2:

[0081] Intermediate A7-1 (1.0 eq) was dissolved in dichloromethane (10 times to Intermediate A7-1) and N-bromosuccinimide (1.05 eq) was slowly put into the round bottom flask for 10 min, and agitated for 4 hours. After 100 ml of the sodium thiosulfate aqueous solution was put and agitated for 20 min, the organic layer was separated. The separated organic layer was washed by 50 ml of the sodium chloride aqueous solution and then dried by magnesium sulfate anhydride. The crude product was purified by column chromatography on silica gel to give Intermediate A7 with white solid, yield 75%.

[0082] Synthesis of Intermediate A8

##STR00128##

[0083] Step 2:

[0084] A solution of benzyl amine (7 g 1 eq), 1-bromo-3,5-diphenylbenzene (42.4 g, 2.1 eq), Pd(OAc).sub.2 (0.29 g, 0.02 eq), P(t-Bu).sub.3HBF.sub.4 (1.51, 0.08 eq), and NaOtBu (18.8 g, 3.0 eq) in toluene (250 ml) was heated under nitrogen at 100 C. for 12 hour. After cooling to room temperature, the solvent was then removed using a rotary evaporator, and the remaining substance was purified with column chromatography to obtain Intermediate A8-1: N,N-di((3,5diphenyl) phenyl)benzylamine (29 g, yield: 78.7%). MS: [M].sup.+=563.73

[0085] Step 2:

[0086] A solution of N,N-di((3,5diphenyl)phenyl)benzylamine (29 g, 1.0 eq), 5% Pd/C (8.2 g, 0.075 eq) in DCM (300 ml) was hydrogenated under hydrogen balloon at room temperature. The reaction was monitored by HPLC. After the completion of reaction, the mixture was filtered over a celite bed with DCM, and concentrated under reduced pressure. The remaining substance was purified with column chromatography to obtain intermediate A8. (18 g, yield: 73.9%). MS: [M].sup.+=473.61.

[0087] Synthesis of Intermediate A15

##STR00129##

[0088] Step 1:

[0089] A solution of benzylamine (5.0 g, 1.0 eq), Intermediate A10 (31.6 g, 2.1 eq), Pd(OAc).sub.2 (0.10 g, 0.01 eq), DPPF (0.54 g, 0.04 eq), and NaOtBu (13.5 g, 3.0 eq) in toluene (180 mL) was heated under nitrogen at 100 C. for 12 hours. After cooling to room temperature, the solvent was then removed using a rotary evaporator, and the remaining substance was purified with column chromatography to obtain Intermediate A15-1 (N-benzyl-9-phenyl-N-(9-phenyl-9H-carbazol-3-yl)-9H-carbazol-3-amine (20.3 g, yield: 73.8%)). MS: [M].sup.+=589.73.

[0090] Step 2:

[0091] A suspension of N-benzyl-9-phenyl-N-(9-phenyl-9H-carbazol-3-yl)-9H-carbazol-3-amine (20.3 g, 1.0 eq) and 5% Pd/C (0.025 eq) in 200 m1 ethyl acetate was stirred for 3 to 6 hours under a hydrogen atmosphere provided by a balloon of hydrogen. The resulting mixture was filtered through a pad of celite and washed with ethyl acetate, and the filtrate was concentrated under reduced pressure to obtain Intermediate A15 (17.2 g, yield: 100%). MS: [M].sup.+=499.6.

[0092] Synthesis of Intermediate A17

##STR00130##

[0093] A solution of bis(4-bromophenyl)amine (35.4 g, 1.0 eq), (9-Phenyl-9H-carbazol-3-yl)boronic acid (2.1 eq), Pd(OAc).sub.2 (0.02 eq), PPh.sub.3 (0.08 eq), and 3M of K.sub.2CO.sub.3 aqueous solution (3.0 eq in H.sub.2O) in toluene (0.3M) was heated under nitrogen at 90 C. for 12 hour. After cooling to room temperature, the solvent was then removed using a rotary evaporator, and the remaining substance was purified with column chromatography to obtain Intermediate A17 (58.7 g, yield: 83.2%). MS: [M].sup.+=651.8.

[0094] Synthesis of Intermediates A16, A18, and A28 to A32

##STR00131##

[0095] A solution of bromo-hetrocyclic compounds (1.0 eq), amine (1.1 eq), Pd(OAc).sub.2 (0.01 eq), DPPF (0.04 eq), and NaOtBu (1.5 eq) in toluene (0.3 M) was heated under nitrogen at 90 C. for 12 hours. After cooling to room temperature, the solvent was then removed using a rotary evaporator, and the remaining substance was purified with column chromatography to obtain Intermediate A16, A18 and A28 to A32, and their yields and MS data were given in the following table.

TABLE-US-00002 TABLE 2 The starting materials A and B used for preparing Intermediates A16, A18 and A28 to A32 and their yields and MS data. Starting Starting Yield Material A Material B Intermediates (%) Mass(M.sup.+) [00132] [00133] [00134] 70.5% 575.70 (C.sub.42H.sub.29N.sub.3) [00135] [00136] [00137] 78.5% 410.51 (C.sub.30H.sub.22N.sub.2) [00138] [00139] [00140] 83.1% 335.4 (C.sub.24H.sub.17NO) [00141] [00142] [00143] 74.8% 411.49 (C.sub.30H.sub.21NO) [00144] [00145] [00146] 40.0% 500.59 (C.sub.36H.sub.24N.sub.2O) [00147] [00148] [00149] 78.5% 501.57 (C.sub.36H.sub.23NO.sub.2) [00150] [00151] [00152] 85.0% 500.59 (C.sub.36H.sub.24N.sub.2O)

[0096] Intermediate B

[0097] To prepare the novel compound of the present invention, Intermediate B may be, for example, but not limited to as follows.

##STR00153##

[0098] Synthesis of Intermediate B1

##STR00154##

[0099] 1-Bromo-3,4-diiodobenzene (300.0 g, 1.0 eq), 10H-dibenzo[b,e][1,4]oxaborinin-10-ol (151.0 g, 1.05 eq) and t-Bu.sub.3P(HBF.sub.4) (10.0 g, 0.015 eq) were put into 3M Cs.sub.2CO.sub.3 aqueous solution (717.0 g, 3.0 eq in 770 ml H.sub.2O) and toluene (1350 ml), and refluxed and agitated for about 24 hours. It was cooled to room temperature, the organic layer was separated from the reaction mixture solution, and the organic layer was dried with anhydrous magnesium sulfate, and filtered. The filtered solution was concentrated under the reduced pressure and purified by silica gel chromatography (evaluation solvent: toluene/n-hexane=1:1) to give the Intermediate B1 (175 g, yield: 73.4%). MS: [M].sup.+=323.18

[0100] Synthesis of Intermediate B2

##STR00155##

[0101] Step 1:

[0102] A mixture of dibenzo[b,f]oxepine (100 g, 1.0 eq) in acetic acid (600 ml) was added bromine (1.1 eq) diluted with acetic acid (200 ml) slowly at 5 C., and the reaction mixture was allowed to be warmed to room temperature. The reaction was monitored by HPLC. After the completion of a reaction, the precipitate was separated by filtration and washed with MeOH then purified by recrystallization. The purified product was concentrated to dryness, whereby a white solid product was obtained in 96.0% yield. The solid product was identified as intermediate B2-1 by a field desorption mass spectroscopy (FD-MS) analysis. FD-MS analysis: C.sub.14H.sub.10Br.sub.2O: theoretical value of 354.04 and observed value of 354.04.

[0103] Step 2:

[0104] The obtained Intermediate B2-1 (116.0 g, 1.0 eq) was dissolved in 700 mL of furan/THF(v/v=2/1), the reaction was cooled to 0 C. and then treated with potassium tert-butoxide (KO-tBu) (3.0 eq). The reaction was allowed to stir at 0 C. for 1 h, and then heated to 40 C. for another 12 h. After the completion of the reaction, the reaction was quenched by DI water and the organic layer was recovered by solvent extraction operation, which was then dried over sodium sulfate. The solvent was removed from the organic layer by distillation under reduced pressure, and the resulting residue was purified by silica gel column chromatography. The purified product was concentrated to dryness, whereby a light yellow solid product was obtained in 51.1% yield. The solid product was identified as Intermediate B2-2 by FD-MS analysis. FD-MS analysis C.sub.18H.sub.12O.sub.2: theoretical value of 260.29 and observed value of 260.29.

[0105] Step 3:

[0106] Intermediate B2-2(20 g, 1.0 eq) and p-toluenesulfonic acid (PTSA) (1.2 eq) in 200 mL of toluene (10 times to B4-2) was heated to reflux for 6 h. The reaction mixture was cooled to room temperature and then quenched with a saturated aqueous solution of NaHCO.sub.3 and extracted with CH.sub.2Cl.sub.2. The organic layer was washed with water, brine and dried with anhydrous Na.sub.2SO.sub.4 subsequently. Then the resulting solution was concentrated under reduced pressure and purified by column chromatography to obtain product as brown oil in a yield of 100%. The oil product was identified as intermediate B2-3 by FD-MS analysis. FD-MS analysis C.sub.18H.sub.12O.sub.2: theoretical value of 260.29 and observed value of 260.29.

[0107] Step 4:

[0108] Intermediate B2-3 (20 g, 1.0 eq) and pyridine (2.0 eq) in 200 mL of CH.sub.2Cl.sub.2 (10 times to B2-3) was cooled to 0 C. Trifluoromethanesulfonic anhydride (1.2 eq) was slowly added, and then the reaction is allowed to be warmed to room temperature and stirred for 2 hours. The reaction was quenched with water and extracted with CH.sub.2Cl.sub.2. The organic layer was washed with water and dried with anhydrous Na.sub.2SO.sub.4 subsequently. Then the resulting solution was concentrated under reduced pressure and purified by column chromatography to obtain white solid in 85.9% yield. The solid product was identified as intermediate B2 by FD-MS analysis. FD-MS analysis C.sub.19H.sub.11F.sub.3O.sub.4S: theoretical value of 392.35 and observed value of 392.35.

[0109] Synthesis of Intermediate B3

##STR00156## ##STR00157##

[0110] Step 1:

[0111] A mixture of 9H-xanthene-9-carboxylic acid (1.0 eq) in acetic acid was added bromine (1.05 eq) diluted with acetic acid slowly at ambient temperature for 18 hours. The reaction was monitored by HPLC. After completion of a reaction, the reaction was quenched with DI water (2800 ml) and stirred for 2 hours. The precipitate was separated by filtration and washed with water again. The precipitate was separated by filtration and dissolved with ethyl acetate, and then the layer of water was separated and the organic layer dried with magnesium sulfate. After drying, this mixture was subjected to suction filtration, and the filtrate was concentrated to obtain white powdery solid in 97% yield. The solid product was identified as intermediate B3-1 by FD-MS analysis. FD-MS analysis: C.sub.14H.sub.9BrO.sub.3: theoretical value of 305.12 and observed value of 305.12.

[0112] Step 2:

[0113] Intermediate B3-1 (1.0 eq) was added slowly into a stirred solution of LiAlH4 (1.5 eq) in anhydrous ether under N.sub.2 and 0 C. The system was stirred for 1 h at room temperature. The reaction was monitored by HPLC. After the completion of the reaction, 3N of HCl solution was slowly dropped. The mixture was extracted with diethyl ether and the combined organic phase was dried over MgSO.sub.4. The excess solvent was removed under reduced pressure, and the resulting residue was purified by silica gel column chromatography to obtain yellow solid in 93% yield. The solid product was identified as intermediate B3-2 by FD-MS analysis. FD-MS analysis: C.sub.14H.sub.11BrO.sub.2: theoretical value of 291.14 and observed value of 291.14.

[0114] Step 3:

[0115] Intermediate B3-2(1 eq) was dissolved in toluene that was added to a suspension of phosphorous pentoxide (6.0 eq) in toluene under N.sub.2 and refluxed at 80 C. for 0.5 hours. The reaction was monitored by HPLC. After the completion of the reaction, the reaction mixture was cooled to 0 C., and 3N HCl solution (400 mL) was slowly dropped. The organic layer was recovered by solvent extraction operation and dried over MgSO.sub.4. The solvent was removed from the organic layer by distillation under reduced pressure, and the resulting residue was purified by silica gel column chromatography to obtain white solid in 93% yield. The solid product was identified as intermediate B3-3 by FD-MS analysis. FD-MS analysis: C.sub.14H.sub.9BrO: theoretical value of 273.12 and observed value of 273.12.

[0116] Step 4:

[0117] A mixture of intermediate B3-3 (1.0 eq) in acetic acid was added bromine (1.0 eq) diluted with acetic acid slowly at 5 C., and the reaction mixture was allowed to be warmed to room temperature. The reaction was monitored by HPLC. After the completion of the reaction, the precipitate was separated by filtration and washed with MeOH and then purified by recrystallization. The purified product was concentrated to dryness, whereby a white solid product was obtained in 96% yield. The solid product was identified as intermediate B3-4 by FD-MS analysis. FD-MS analysis: C.sub.14H.sub.9Br.sub.3O: theoretical value of 432.93 and observed value of 432.93.

[0118] Step 5:

[0119] Intermediate B3-4 (1.0 eq) was dissolved in furan and THF, the reaction was cooled to 0 C. and then treated with potassium t-butoxide (3.0 eq). The reaction was allowed to stir for 1 hour at 0 C. prior to raise up to 50 C. and stirred for another 12 hours. Quenched by DI water, the organic layer was recovered by solvent extraction operation and dried over MgSO.sub.4. The solvent was removed from the organic layer by distillation under reduced pressure, and the resulting residue was purified by silica gel column chromatography. The purified product was concentrated to dryness, whereby a light yellow solid bridge furan compound was obtained in 72% yield. The solid product was identified as Intermediate B3-5 by FD-MS analysis. FD-MS analysis: C.sub.18H.sub.11BrO.sub.2: theoretical value of 339.18 and observed value of 339.18.

[0120] Step 6:

[0121] A suspension of Intermediate B3-5 (1.0 eq) and 5% Pd/C (0.025 eq) in ethyl acetate was stirred for 3 to 6 hours under a hydrogen atmosphere provided by a balloon of hydrogen. The resulting mixture was filtered through a pad of celite and washed with ethyl acetate, and the filtrate was concentrated under reduced pressure to obtain product as a yellow solid in 100% yield, and the compound could be directly used in the following reaction without further purified. The product was identified as Intermediate B3-6 by FD-MS analysis. FD-MS analysis: C.sub.18H.sub.13BrO.sub.2: theoretical value of 3412 and observed value of 341.2.

[0122] Step 7:

[0123] A mixture of Intermediate B3-6 (1.0 eq) and p-toluenesulfonic acid (2.0 eq) in toluene was heated to reflux for 12 hours. The reaction mixture was cooled to room temperature and then quenched with a saturated aqueous solution of NaHCO.sub.3 and extracted with toluene. The organic layer was washed with water, brine and dried with anhydrous Na.sub.2SO.sub.4 subsequently. Then the resulting solution was concentrated under reduced pressure and purified by column chromatography on silica gel to obtain white solid in 94% yield. The product was identified as intermediate B3 by FD-MS analysis. FD-MS analysis: C.sub.18H.sub.11BrO: theoretical value of 323.18 and observed value of 323.18.

[0124] Intermediate C

[0125] To prepare the novel compound of the present invention, Intermediate C may be, for example, but not limited to as follows.

##STR00158## ##STR00159##

[0126] Synthesis of Intermediate C1 to C3

##STR00160##

[0127] Intermediate B1 or B2 (1.0 eq), chlorophenylboronic acid (1.2 eq, CAS 1679-18-1), Pd(OAc).sub.2 (0.015 eq), PPh.sub.3 (0.06 eq), K.sub.2CO.sub.3 (1.5 eq, 3M) in toluene (0.3M) were heated at 100 C. for 12 hours. After the completion of the reaction, the volatiles were removed under vacuum, and the resulting solution extracted with CH.sub.2Cl.sub.2. The combined organic extract was washed with brine solution, dried over Na.sub.2SO.sub.4. Then the resulting solution was concentrated under reduced pressure and purified by column chromatography to obtain white solid. The analysis data of the obtained products, i.e. Intermediates C1 to C3 as listed in the following Table 3.

TABLE-US-00003 TABLE 3 The starting materials, including Intermediate B and chlorophenyl boronic acid, used for preparing Intermediates C1 to C3 and their yields and MS data. Intermediate Chlorophenyl Yield Formula B boronic acid Intermediate C (%) (FD-MS) Intermediate B1 [00161] [00162] 90 C.sub.24H.sub.15ClO (354.83) Intermediate B2 [00163] [00164] 95 C.sub.24H.sub.15ClO (354.83) Intermediate B2 [00165] [00166] 93 C.sub.24H.sub.15ClO (354.83)

[0128] Synthesis of Intermediate C4

##STR00167##

[0129] A solution of Intermediate A5 (11.50 g, 1.1 eq), Intermediate B1 (20.00 g, 1 eq), Pd(OAc).sub.2 (0.14 g, 0.01 eq), DPPF (1.37 g, 0.04 eq), and NaOtBu (8.92 g, 1.5 eq) in toluene (160 ml) was heated under nitrogen at 90 C. for 12 hours. After cooling to room temperature, the solvent was then removed using a rotary evaporator, and the remaining substance was purified with column chromatography to obtain Intermediate C4. (25.3 g, yield: 81.5%). MS: [M].sup.+=411.49.

[0130] Synthesis of Intermediate C5

##STR00168##

[0131] A solution of benzyl amine (5 g, 1 eq), Intermediate B1 (31.7 g, 2.1 eq), Pd(OAc).sub.2 (0.1 g, 0.01 eq), P(t-Bu).sub.3HBF.sub.4 (0.5, 0.04 eq), and NaOtBu (13.5 g, 3.0 eq) in toluene (185 ml) was heated under nitrogen at 100 C. for 12 hours. After cooling to room temperature, the solvent was then removed using a rotary evaporator, and the remaining substance was purified with column chromatography to obtain N,N-diTBObenzylamine (17.5 g, yield: 74.8%). MS: [M].sup.+=591.7.

[0132] Step 2:

[0133] A solution of N,N-diTBObenzylamine (20 g, 1.0 eq), 5% Pd/C (5.4 g, 0.075 eq) and acetic acid (12.6 g, 6.2 eq) in DCM (100 ml) was hydrogenated under hydrogen balloon at room temperature. The reaction was monitored by HPLC. After completion of reaction, the mixture was filtered over a celite bed with DCM, and concentrated under reduced pressure. The remaining substance was purified with column chromatography to obtain Intermediate C5 (12.8 g, yield: 75.5%). MS: [M].sup.+=501.57.

[0134] Synthesis of Intermediate C6

##STR00169##

[0135] A mixture of Intermediate C3 (1.0 eq), bis(pinacolato)diboron (1.2 eq), Pd.sub.2(dba).sub.3 (0.015 eq), P(Cy).sub.3HBF.sub.4 (0.06 eq), KOAc (3.0 eq) in 1,4-Dioxane (0.3M) was heated at 110 C. for 8 hours under nitrogen atmosphere. After cooling to room temperature, the solvent was then removed under reduced pressure, and the residue was purified via column chromatography to obtain white solids in 98.6% yield. The solid product was identified as intermediate C6 by FD-MS analysis. FD-MS analysis: C.sub.30H.sub.27BO.sub.3: theoretical value of 446.34 and observed value of 446.34.

[0136] Synthesis of Intermediates C7 and C8

##STR00170##

[0137] A solution of Intermediate B1 (1.0 eq), Intermediate A9 or A13 (1.1 eq), Pd(OAc).sub.2 (0.01 eq), DPPF (0.04 eq), and NaOtBu (1.5 eq) in toluene (0.5M) was heated under nitrogen at 90 C. for 12 hours. After cooling to room temperature, the solvent was then removed using a rotary evaporator, and the remaining substance was purified with column chromatography to respectively obtain Intermediate C7 and C8 as listed in the following Table 4.

TABLE-US-00004 TABLE 4 The starting materials, including Intermediate A and B, used for preparing Intermediates C7 and C8 and their yields and MS data. Intermediate Intermediate Yield Mass B A Intermediate C (%) (M.sup.+) Intermediate B1 Intermediate A9 [00171] 54.4% 500.59 (C.sub.36H.sub.24N.sub.2O) Intermediate B1 Intermediate A13 [00172] 80.6% 576.68 (C.sub.42H.sub.28N.sub.2O)

[0138] Synthesis of intermediate C9

##STR00173##

[0139] A solution of Intermediate B1(8 g, 1.0 eq), Intermediate A27 (1.1 eq), Pd(OAc).sub.2 (0.01 eq), DPPF (0.04 eq), and NaOtBu (1.5 eq) in toluene (0.5 M) was heated under nitrogen at 90 C. for 12 hours. After cooling to room temperature, the solvent was then removed using a rotary evaporator, and the remaining substance was purified with column chromatography to obtain intermediate C9 (8.5 g, yield: 68.5%). MS: [M].sup.+=501.57.

[0140] Synthesis of Novel Compounds

[0141] The general synthesis pathway of the claimed novel compound was summarized in Scheme I-A or Scheme I-B. In the following Scheme I-A or Scheme I-B, Reactant A may be any one of Intermediate A1 to A32 as listed in Table 1 or Intermediates C1 to C9 as stated above, and Reactant B may be any one of Intermediate B1 to B3 or C1 to C9 as stated above. The compounds were each synthesized by the following method A or B and results were listed in Table 5.

##STR00174##

[0142] General Procedure A:

[0143] A mixture of Reactant A (1.00 eq), Reactant B (1.00 eq), Pd(OAc).sub.2 (0.005 eq), P(t-Bu).sub.3HBF.sub.4 (0.02 eq), and NaOtBu (1.5 eq) in toluene (0.3M) was heated at 90 C. for 12 h. The solvent was evaporated, and the residue was dissolved in methylene dichloride and filtered. The filtrate was washed with DI water (2 times), and the organic layer was dried with MgSO.sub.4. This was filtered, and the solvent was evaporated to give the novel compound with white solid. Herein, Compounds 1 to 4, 6 to 10, 14, 15, 18 to 29, 31 to 41, and 43 were synthesized through method A.

##STR00175##

[0144] General Procedure B:

[0145] A mixture of Reactant A (1.0 eq), Reactant B (1.00 eq), Pd.sub.2(dba).sub.3 (0.015 eq), P(t-Bu).sub.3HBF.sub.4 (0.06 eq), and NaOtBu (3.0 eq) in toluene (0.3M) was heated at 100 C. for 12 hours. The solvent was evaporated, and the residue was dissolved in methylene dichloride and filtered. The filtrate was washed with DI water (2 times), and the organic layer was dried with MgSO.sub.4. This was filtered, and the solvent was evaporated to give the novel compound with white solid. Herein, Compounds 11 to 13, 16, 17, 30, and 42 were synthesized through method B.

[0146] Synthesis of Compound 5

##STR00176##

[0147] A solution of Intermediate A7 (1 eq), Intermediate C6(1.2 eq), Pd(OAc).sub.2 (0.01 eq), P(Cy).sub.2(2-biphenyl) (0.04 eq), and Na.sub.2CO.sub.3 (3.0 eq) in toluene (0.54 M), EtOH (0.05M) and water (2 M) was heated under nitrogen at 80 C. for 12 hours. After cooling to room temperature, the solvent was then removed using a rotary evaporator, and the remaining substance was purified with column chromatography to obtain Compound 5.

[0148] Reactant A and Reactant B adopted to synthesize Compounds 1 to 43 were listed in Table 5. Compounds 1 to 43 were identified by H.sup.1-NMR and FD-MS, and the chemical structure, yield, formula and mass of each of Compounds 1 to 43 were also listed in Table 5. According to FIGS. 2 to 44 and the results of FD-MS, the chemical structure of Compounds 1 to 43 were identified as follows.

TABLE-US-00005 TABLE 5 The reactants A and B used for preparing the novel compounds and their yields and MS data. Mass(M.sup.+) Chemical Structure of Yield Theoretical Reactant A Reactant B Novel Compound (%) (found) Intermediate A1 Intermediate B1 [00177] 85.2% 563.69 (C.sub.42H.sub.29NO) Intermediate A1 Intermediate C1 [00178] 90.1% 639.78 (C.sub.48H.sub.33NO) Intermediate A1 Intermediate C2 [00179] 80.5% 639.78 (C.sub.48H.sub.33NO) Intermediate A1 Intermediate C3 [00180] 88.9% 639.78 (C.sub.48H.sub.33NO) Intermediate A7 Intermediate C6 [00181] 86.3% 715.88 (C.sub.57H.sub.37NO) Intermediate A8 Intermediate B1 [00182] 97.3% 715.88 (C.sub.57H.sub.37NO) Intermediate C4 Intermediate C1 [00183] 94.5% 729.86 (C.sub.54H.sub.35NO.sub.2) Intermediate C4 Intermediate B1 [00184] 96.1% 653.77 (C.sub.48H.sub.31NO.sub.2) Intermediate C5 Intermediate B1 [00185] 88.5% 743.84 (C.sub.54H.sub.33NO.sub.3) Intermediate C5 Intermediate C1 [00186] 91.8% 819.94 (C.sub.60H.sub.37NO.sub.3) Intermediate A5 Intermediate B1 [00187] 93.7% 653.77 (C.sub.48H.sub.31NO.sub.2) Intermediate A5 Intermediate C1 [00188] 88.3% 805.96 (C.sub.60H.sub.39NO.sub.2) Intermediate A6 Intermediate C2 [00189] 84.6% 729.86 (C.sub.54H.sub.3NO.sub.2) Intermediate A2 Intermediate B1 [00190] 91.5% 654.8 (C.sub.48H.sub.34N.sub.2O) Intermediate A3 Intermediate B1 [00191] 83.3% 820.97 (C.sub.60H.sub.40N.sub.2O.sub.2) Intermediate A4 Intermediate B1 [00192] 86.9% 820.97 (C.sub.60H.sub.40N.sub.2O.sub.2) Intermediate A4 Intermediate C1 [00193] 87.9% 973.16 (C.sub.72H.sub.48N.sub.2O.sub.2) Intermediate A2 Intermediate C1 [00194] 90.3% 730.89 (C.sub.54H.sub.38N.sub.2O) Intermediate B1 Intermediate A18 [00195] 92.6% 652.78 (C.sub.48H.sub.32N.sub.2O) Intermediate C1 Intermediate A18 [00196] 89.4% 728.88 (C.sub.54H.sub.36N.sub.2O) Intermediate C2 Intermediate A18 [00197] 87.6% 894.07 (C.sub.66H.sub.43N.sub.3O) Intermediate B1 Intermediate A8 [00198] 89.7% 741.88 (C.sub.54H.sub.35N.sub.3O) Intermediate C1 Intermediate A8 [00199] 90.3% 817.97 (C.sub.60H.sub.39N.sub.3O) Intermediate B1 Intermediate A16 [00200] 87.9% 817.97 (C.sub.60H.sub.39N.sub.3O) Intermediate C1 Intermediate A16 [00201] 92.6% 894.07 (C.sub.66H.sub.43N.sub.3O) Intermediate B1 Intermediate A17 [00202] 91.0% 894.07 (C.sub.66H.sub.43N.sub.3O) Intermediate B1 Intermediate A19 [00203] 93.7% 652.78 (C.sub.48H.sub.32N.sub.2O) Intermediate B1 Intermediate A20 [00204] 90.9% 728.88 (C.sub.54H.sub.36N.sub.2O) Intermediate C1 Intermediate A20 [00205] 88.8% 804.97 (C.sub.60H.sub.40N.sub.2O) Intermediate B1 Intermediate A12 [00206] 95.0% 650.76 (C.sub.48H.sub.30N.sub.2O) Intermediate A10 Intermediate C5 [00207] 92.5% 742.86 (C.sub.54H.sub.34N.sub.2O.sub.2) Intermediate C1 Intermediate C7 [00208] 87.9% 818.96 (C.sub.60H.sub.38N.sub.2O.sub.2) Intermediate A14 Intermediate C5 [00209] 93.3% 818.96 (C.sub.60H.sub.38N.sub.2O.sub.2) Intermediate B3 Intermediate C8 [00210] 82.5% 895.05 (C.sub.66H.sub.42N.sub.2O.sub.2) Intermediate C1 Intermediate C8 [00211] 88.6% 895.05 (C.sub.66H.sub.42N.sub.2O.sub.2) Intermediate B1 Intermediate A29 [00212] 90.1% 653.77 (C.sub.48H.sub.31NO.sub.2) Intermediate C1 Intermediate A29 [00213] 91.3% 729.86 (C.sub.54H.sub.35NO.sub.2) Intermediate C2 Intermediate A29 [00214] 86.3% 729.86 (C.sub.54H.sub.35NO.sub.2) Intermediate B1 Intermediate A30 [00215] 88.4% 742.86 (C.sub.54H.sub.34N.sub.2O.sub.2) Intermediate B1 Intermediate A31 [00216] 94.5% 743.84 (C.sub.54H.sub.3.NO3) Intermediate B3 Intermediate C9 [00217] 94.5% 743.84 (C.sub.54H.sub.33NO.sub.3) Intermediate B1 Intermediate A27 [00218] 91.3% 743.84 (C.sub.54H.sub.33NO.sub.3) Intermediate C1 Intermediate A32 [00219] 86.5% 818.96 (C.sub.60H.sub.38N.sub.2O.sub.2)

[0149] Preparation of OLED Devices

[0150] A glass substrate coated with ITO layer in a thickness of 1500 was placed in distilled water containing a detergent dissolved therein, and was ultrasonically washed. The detergent was a product manufactured by Fischer Co., and the distilled water was distilled water filtered twice through a filter (Millipore Co.). After the ITO layer had been washed for 30 minutes, it was ultrasonically washed twice with distilled water for 10 minutes. After the completion of washing, the glass substrate was ultrasonically washed with isopropyl alcohol, acetone and methanol solvents and then dried, after which it was transported to a plasma cleaner. Then the substrate was cleaned with oxygen plasma for 5 minutes, and then transferred to a vacuum evaporator.

[0151] After that, various organic materials and metal materials were sequentially deposited on the ITO substrate to obtain the OLED device of each of the following Examples and Comparative Examples. The vacuum degree during the deposition was maintained at 110.sup.6 to 310.sup.7 torr. Herein, the ITO substrate was deposited with a first hole injection layer (HIL-1), a second hole injection layer (HIL-2), a first hole transporting layer (HTL-1), a second hole transporting layer (HTL-2), a blue/green/red emission layer (BEL/GEL/REL), an electron transporting layer (ETL), an electron injection layer (EIL), and a cathode (Cthd).

[0152] Herein, HAT was a material for forming HIL-1; the foresaid novel compounds, HI-2, and HI-2 might be the material for forming HIL-2; the foresaid novel compounds and commercial HT-1, HT-2, or HT-2 might be the material for forming HTL-1 or HTL-2; ET was materials for forming ETL; Liq was a material for forming ETD and EIL. RH/GH/BH were host material for forming REL/GEL/BEL, and RD/GD/BD-1 or BD-2 were dopant for forming REL/GEL/BEL. The detailed chemical structures of foresaid commercial materials were listed in Table 6, and the novel compounds of the present invention were listed in Table 5.

TABLE-US-00006 TABLE 6 chemical structures of commercial materials for OLED devices. [00220] HAT [00221] HI-2 [00222] HT-1 [00223] HT-2 [00224] ET [00225] Liq [00226] RH [00227] GH [00228] BH [00229] RD [00230] GD [00231] BD-1 [00232] BD-2 [00233] NPB [00234] HT-2 [00235] HI-2 (m-MTDATA)

[0153] Preparation of Red OLED Devices

[0154] To prepare the red OLED device, multiple organic layers were respectively deposited on the ITO substrate according to the sequence as listed in Table 7, and the materials and the thicknesses of the organic layers in red OLED devices were also listed in Table 7.

TABLE-US-00007 TABLE 7 coating sequence, materials and thickness of the organic layers in red OLED device. Coating Sequence Layer Material Thickness 1 HIL-1 HAT 100 2 HIL-2 HI-2 or novel compound doped with 2100 5.0 wt % of HAT 3 HTL-1 Commercial HT-1 or novel compound 100 4 HTL-2 Commercial HT-2 or novel compound 100 5 REL RH doped with 3.5 wt % of RD 300 6 ETL ET doped with 35.0 wt % of Liq 350 7 EIL Liq 15 8 Cthd Al 1500

[0155] To prepare the green OLED device, multiple organic layers were respectively deposited on the ITO substrate according to the sequence as listed in Table 8, and the materials and the thicknesses of the organic layers in green OLED devices were also listed in Table 8.

TABLE-US-00008 TABLE 8 coating sequence, materials and thickness of the layers in green OLED device. Coating Sequence Layer Material Thickness 1 HIL-1 HAT 100 2 HIL-2 HI-2 or novel compound doped with 1300 5.0 wt % of HAT 3 HTL-1 Commercial HT-1 or novel compound 100 4 HTL-2 Commercial HT-2 or novel compound 100 5 GEL GH doped with 10.0 wt % of GD 400 6 ETL ET doped with 35.0 wt % of Liq 350 7 EIL Liq 15 8 Cthd Al 1500

[0156] Preparation of Blue OLED Devices

[0157] To prepare the blue OLED device, multiple organic layers were respectively deposited on the ITO substrate according to the sequence as listed in Table 9, and the materials and the thicknesses of the organic layers in blue OLED devices were also listed in Table 9.

TABLE-US-00009 TABLE 9 coating sequence, materials and thickness of the layers in blue OLED device. Coating Sequence Layer Material Thickness 1 HIL-1 HAT 100 2 HIL-2 HI-2 or novel compound doped with 750 5.0 wt % of HAT 3 HTL-1 Commercial HT-1 or novel compound 100 4 HTL-2 Commercial HT-2 or novel compound 100 5 BEL BH doped with 3.5 wt % of BD-1 or 250 BD-2 6 ETL ET doped with 35.0 wt % of Liq 250 7 EIL Liq 15 8 Cthd Al 1500

[0158] Performance of OLED Device

[0159] To evaluate the performance of OLED devices, red, green, and blue OLED devices were measured by PR650 as photometer and Keithley 2400 as power supply. Color coordinates (x,y) were determined according to the CIE chromaticity scale (Commission Internationale de L'Eclairage, 1931). The results were shown in Tables 10 to 12. For the blue and red OLED devices, the data were collected at 1000 nits. For the green OLED devices, the data were collected at 3000 nits.

[0160] In the first test example, the materials of HL-2, HTL-1, and HTL-2, color and data of CIE, driving voltage, and current efficiency of Examples 1 to (E1 to E13) and Comparative Examples 1 to 3 (C1 to C3) were listed in Table 10. The difference between the examples and the comparative examples was the material of the HIL-2.

TABLE-US-00010 TABLE 10 materials of HIL-2, HTL-1, and HTL-2, voltage, CIE (x, y) and current efficiency (E) of OLED devices of Examples 1 to 13 and Comparative Examples 1 to 3. Ex- am- Material ple HTL- HTL- Voltage E No. HIL-2 1 2 (V) CIE (x, y) (cd/A) E1 Compound 24 HT1 HT-2 5.33 B(0.136, 0.171) 10.9 E2 Compound 25 HT-1 HT-2 5.27 B(0.137, 0.163) 9.59 E3 Compound 26 HT-1 HT-2 4.73 B(0.136, 0.166) 12.7 E4 Compound 43 HT-1 HT-2 6.11 B(0.136, 0.174) 8.99 E5 Compound 19 HT-1 HT-2 5.73 B(0.136, 0.176) 10.7 C1 m-MTDATA HT-1 HT-2 6.81 B(0.14, 0.187) 4.59 E6 Compound 24 HT-1 HT-2 3.29 G(0.312, 0.640) 62 E7 Compound 25 HT-1 HT-2 4.08 G(0.312, 0.638) 67.8 E8 Compound 26 HT-1 HT-2 3.71 G(0.308, 0.641) 64.3 E9 Compound 19 HT-1 HT-2 4.19 G(0.322, 0.634) 63 C2 m-MTDATA HT-1 HT-2 4.22 G(0.325, 0.631) 55.5 E10 Compound 16 HT-1 HT-2 4.59 R(0.659, 0.339) 24.4 E11 Compound 25 HT-1 HT-2 4.85 R(0.662, 0.336) 22.1 E12 Compound 26 HT-1 HT-2 4.36 R(0.659, 0.339) 22.4 E13 Compound 19 HT-1 HT-2 4.95 R(0.661, 0.338) 22.7 C3 m-MTDATA HT-1 HT-2 5.1 R(0.656, 0.341) 20.4

[0161] In the above Table 10, the materials of HTL-1 of Examples were all commercial HT-1 as shown in Table 6, and the materials of HTL-2 of Examples were all commercial HT-2 as shown in Table 6. The dopants of BELs of blue OLEDs of E1 to E5 and C1 were BD-1.

[0162] According to the results of Table 10, in comparison with the commercial hole injection material m-MTDATA, adopting the novel compound of the present invention as the hole injection material can reduce the driving voltage and improve the current efficiency of the red, green, or blue OLEDs. It demonstrated that the novel compound of the present invention is suitable as a hole injection material for any color OLEDs, and allows the OLEDs using the same to have low driving voltage and improved current efficiency.

[0163] In the second test example, the materials of HIL-2, HTL-1, and HTL-2, color and data of CIE, driving voltage, and current efficiency of Examples 14 to 69 (E14 to E69) and Comparative Examples 4 to 9 (C4 to C9) were listed in Table 11. The major difference between the examples and the comparative examples was the material of the HTL-1. The material of the hole injection layer of E14 to E69 and C4 to C9 was commercial HI-2 as listed in Table 6.

TABLE-US-00011 TABLE 11 materials of dopant of emission layer, HTL-1, and HTL-2, voltage, CIE (x, y) and current efficiency (E) of OLED devices of Examples 14 to 69 and Comparative Examples 4 to 9. Dopant of emission Material Voltage E Exp layer HTL-1 HTL-2 (V) CIE (x, y) (cd/A) E14 BD-1 compound 1 HT-2 4.25 B(0.136, 0.178) 13 E15 BD-1 compound 2 HT-2 4.34 B(0.136, 0.188) 13.2 E16 BD-1 compound 9 HT-2 4.6 B(0.136, 0.181) 12.4 E17 BD-1 compound 15 HT-2 4.47 B(0.136, 0.173) 13.3 E18 BD-1 compound 12 HT-2 4.4 B(0.136, 0.171) 12.1 E19 BD-1 compound 27 HT-2 4.33 B(0.136, 0.178) 12.7 E20 BD-1 compound 28 HT-2 4.52 B(0.136, 0.184) 11.6 E21 BD-1 compound 29 HT-2 4.29 B(0.136, 0.171) 12 E22 BD-1 compound 31 HT-2 4.57 B(0.136, 0.195) 13 E23 BD-1 compound 32 HT-2 4.42 B(0.136, 0.178) 13.1 E24 BD-1 compound 36 HT-2 4.21 B(0.136, 0.168) 12.6 E25 BD-1 compound 37 HT-2 4.74 B(0.137, 0.163) 11 E26 BD-1 compound 39 HT-2 4.41 B(0.135, 0.181) 11.1 E27 BD-1 compound 42 HT-2 4.65 B(0.136, 0.177) 11.3 E28 BD-2 compound 38 HT-2 4.53 B(0.13, 0.155) 11 E29 BD-2 compound 5 HT-2 4.66 B(0.13, 0.155) 10.4 E30 BD-2 compound 14 HT-2 4.69 B(0.130, 0.152) 11.2 E31 BD-2 compound 7 HT-2 4.56 B(0.129, 0.156) 10.2 E32 BD-2 compound 34 HT-2 4.53 B(0.13, 0.150) 10.8 C4 BD-1 NPB HT-2 4.97 B(0.129, 0.180) 10.6 C5 BD-2 NPB HT-2 4.77 B(0.129, 0.160) 9.5 E33 GD compound 1 HT-2 3.36 G(0.319, 0.637) 75.9 E34 GD compound 2 HT-2 3.29 G(0.319, 0.636) 71.4 E35 GD compound 14 HT-2 3.33 G(0.312, 0.639) 70.5 E36 GD compound 7 HT-2 3.63 G(0.308, 0.640) 71.0 E37 GD compound 8 HT-2 3.46 G(0.315, 0.638) 81.7 E38 GD compound 10 HT-2 3.59 G(0.309, 0.639) 74.5 E39 GD compound 9 HT-2 3.59 G(0.320, 0.636) 73.7 E40 GD compound 15 HT-2 3.50 G(0.320, 0.636) 78.8 E41 GD compound 17 HT-2 3.18 G(0.313, 0.639) 71.3 E42 GD compound 11 HT-2 3.55 G(0.312, 0.640) 78.0 E43 GD compound 27 HT-2 3.42 G(0.317, 0.638) 76.3 E44 GD compound 28 HT-2 3.10 G(0.315, 0.638) 75.5 E45 GD compound 29 HT-2 3.30 G(0.311, 0.640) 74.3 E46 GD compound 31 HT-2 3.24 G(0.32, 0.636) 71.6 E47 GD compound 33 HT-2 3.12 G(0.313, 0.639) 74.0 E48 GD compound 34 HT-2 3.49 G(0.312, 0.640) 74.0 E49 GD compound 36 HT-2 3.26 G(0.313, 0.639) 70.6 E50 GD compound 37 HT-2 3.29 G(0.31, 0.640) 71.3 E51 GD compound 40 HT-2 3.50 G(0.31 0.640) 70.5 E52 GD compound 42 HT-2 3.39 G(0.312, 0.640) 74.3 C6 GD NPB HT-2 3.68 G(0.317, 0.637) 70.1 C7 GD HT-1 HT-2 5.64 G(0.318, 0.637) 69.4 E53 RD compound 1 HT-2 3.47 R(0.662, 0.337) 22.5 E54 RD compound 2 HT-2 3.36 R(0.660, 0.339) 23.8 E55 RD compound 14 HT-2 3.30 R(0.661, 0.338) 23.1 E56 RD compound 7 HT-2 3.58 R(0.658, 0.340) 24.0 E57 RD compound 10 HT-2 3.56 R(0.659, 0.339) 23.6 E58 RD compound 9 HT-2 3.63 R(0.659, 0.339) 24.7 E59 RD compound 17 HT-2 3.29 R(0.662, 0.337) 20.9 E60 RD compound 11 HT-2 3.61 R(0.660, 0.339) 22.8 E61 RD compound 12 HT-2 3.49 R(0.661, 0.338) 23.1 E62 RD compound 27 HT-2 3.58 R(0.662, 0.337) 23.4 E63 RD compound 28 HT-2 3.32 R(0.659, 0.340) 23.7 E64 RD compound 29 HT-2 3.39 R(0.66, 0.339) 24.0 E65 RD compound 31 HT-2 3.38 R(0.663, 0.335) 23.5 E66 RD compound 33 HT-2 3.25 R(0.659, 0.340) 24.1 E67 RD compound 36 HT-2 3.35 R(0.659, 0.340) 22.9 E68 RD compound 37 HT-2 3.36 R(0.658, 0.340) 23.0 E69 RD compound 42 HT-2 3.55 R(0.661, 0.338) 25.2 C8 RD NPB HT-2 3.67 R(0.661, 0.330) 21.3 C9 RD HT-1 HT-2 3.69 R(0.667, 0.332) 20.7

[0164] In the third test example, the materials of HTL-1, and HTL-2, color and data of CIE, driving voltage, and current efficiency of Examples 70 to 81 (E70 to E81) and Comparative Examples 10 to 15 (C10 to C15) were listed in Table 12. The major difference between the examples and the comparative examples was the material of the HTL-2. The material of the hole injection layer of E70 to E83 and C10 to C15 was commercial HI-2 as listed in Table 6 and the material of the dopant of BEL of E70 to E72, C10, and C11 was BD-2 as listed in Table 6.

TABLE-US-00012 TABLE 12 materials of HTL-1 and HTL-2, voltage, CIE (x, y) and current efficiency (E) of OLED devices of Examples 70 to 81 and Comparative Examples 10 to 15. Material Voltage E Exp HTL-1 HTL-2 (V) CIE (x, y) (cd/A) E70 HT-1 compound 1 4.12 B(0.135, 0.165) 11.4 E71 HT-1 compound 3 4.11 B(0.128, 0.156) 11.4 E72 HT-1 compound 13 4.08 B(0.13, 0.144) 10.9 C10 HT-1 HT-2 4.49 B(0.129, 0.169) 9.1 C11 HT-1 HT-2 4.14 B(0.129, 0.151) 10.4 E73 HT-1 compound 1 3.16 G(0.317, 0.638) 75.0 E74 HT-1 compound 3 3.41 G(0.318, 0.636) 70.0 E75 HT-1 compound 6 3.51 G(0.315, 0.637) 71.8 E76 HT-1 compound 13 3.42 G(0.314, 0.632) 72.4 C12 HT-1 HT-2 3.82 G(0.312, 0.639) 48.6 C13 HT-1 HT-2 5.64 G(0.318, 0.637) 69.4 E77 HT-1 compound 1 3.36 R(0.663, 0.336) 21.3 E78 HT-1 compound 3 3.51 R(0.659, 0.339) 21.4 E79 HT-1 compound 11 3.24 R(0.661, 0.338) 22.7 E80 HT-1 compound 13 3.36 R(0.657, 0.342) 24.9 E81 HT-1 compound 41 3.6 R(0.655, 0.343) 28.4 C14 HT-1 HT-2 3.69 R(0.667, 0.332) 20.7 C15 HT-1 HT-2 6.43 R(0.635, 0.354) 6.88

[0165] According to the results of Tables 11 and 12, in comparison with the commercial hole transport material such as HT-1, HT-2 or HT-2, adopting the novel compound of the present invention as the hole transport material can reduce the driving voltage and improve the current efficiency of the red, green, or blue OLEDs. The beneficial effects of adopting the novel compounds as hole transport material can be found from the results of E14 to E27 in comparison with C4, the results of E28 to E32 in comparison with C5, the results of E33 to E52 in comparison with C6 and C7, the results of E53 to E69 in comparison with C8 and C9 as listed in Table 11. Likely, the beneficial effects of adopting the novel compounds as hole transport material also can be found from the results of E70 to E72 in comparison with C10 and C11, the results of E73 to E76 in comparison with C12 and C13, and the results of E77 to E81 in comparison with C14 and C15 as listed in Table 12. It demonstrated that the novel compound of the present invention is suitable as a hole transport material for any color OLEDs, and allows the OLEDs using the same to have low driving voltage and improved current efficiency.

[0166] Even though numerous characteristics and advantages of the present invention have been set forth in the foregoing description, together with details of the structure and features of the invention, the disclosure is illustrative only. Changes may be made in the details, especially in matters of quantity, position, and arrangement of substitution groups within the principles of the invention to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.