Organic Electronic Device, Display and LIghting Devices Comprising the Same

Abstract

The invention relates to an organic electronic device comprising at least one electron transport, electron injection or electron generation layer comprising a compound of Formula (I) wherein all positions which are not linked to a -(A)a-L moiety at a *- position may be bound to another substituent; A is selected from substituted or unsubstituted aryl or heteroaryl; L is selected from substituted or unsubstituted aryl or heteroaryl or a group (II) and (III); and a is an integer from 0 to 2; to the compounds of Formula (I) as well as to display and lightning devices comprising the same.

##STR00001##

Claims

1. Organic electronic device comprising, between an anode and a cathode, at least one layer selected from an electron transport layer, an electron injection layer or an electron generation layer, the layer comprising a compound of the Formula (I) ##STR00106## wherein in the above Formula (I) all positions which are not linked to a -(A).sub.a-L moiety at a * position may be bound to hydrogen or a substituent selected from the group consisting of deuterium, fluorine, RF, C.sub.1-C.sub.20 linear alkyl, C.sub.3-C.sub.20 branched alkyl, C.sub.1-C.sub.12 linear fluorinated alkyl, CN, RCN, C.sub.6-C.sub.20 aryl, C.sub.2-C.sub.20 heteroaryl, (PO)R.sub.2; wherein each R is independently selected from C.sub.1-C.sub.20 linear alkyl, C.sub.1-C.sub.20 alkoxy, C.sub.1-C.sub.20 thioalkyl, C.sub.3-C.sub.20 branched alkyl, C.sub.3-C.sub.20 cyclic alkyl, C.sub.3-C.sub.20 branched alkoxy, C.sub.3-C.sub.20 cyclic alkoxy, C.sub.3-C.sub.20 branched thioalkyl, C.sub.3-C.sub.20 cyclic thioalkyl, C.sub.6-C.sub.20 aryl and C.sub.2-C.sub.20 heteroaryl; A is selected from substituted or unsubstituted C.sub.6-C.sub.24 aryl or substituted or unsubstituted C.sub.2-C.sub.20 heteroaryl, wherein in case that the group A is substituted, the respective substituents are independently selected from the group consisting of deuterium, fluorine, C.sub.1-C.sub.20 linear alkyl, C.sub.3-C.sub.20 branched alkyl, linear fluorinated C.sub.1-C.sub.12 alkyl, CN, C.sub.6-C.sub.20 aryl, C.sub.2-C.sub.20 heteroaryl; L is selected from the group consisting of substituted or unsubstituted C.sub.2-C.sub.42 heteroaryl, substituted or unsubstituted C.sub.6-C.sub.24 aryl or a group selected from ##STR00107## wherein, in case that L is substituted, the respective substituents are selected from the group consisting of Deuterium, fluorine, C.sub.1-C.sub.20 linear alkyl, C.sub.3-C.sub.20 branched alkyl, C.sub.3-C.sub.20 cyclic alkyl, C.sub.1-C.sub.20 linear alkoxy, C.sub.3-C.sub.20 branched alkoxy, linear fluorinated C.sub.1-C.sub.12 alkyl, linear fluorinated C.sub.1-C.sub.12 alkoxy, C.sub.3-C.sub.12 branched fluorinated cyclic alkyl, C.sub.3-C.sub.12 fluorinated cyclic alkyl, C.sub.3-C.sub.12 fluorinated cyclic alkoxy, CN, RCN, C.sub.6-C.sub.20 aryl, C.sub.2-C.sub.20 heteroaryl, OR, SR, (CO)R, (CO)NR2, SiR.sub.3, (SO)R, (SO).sub.2R, (PO)R.sub.2; wherein each Ris independently selected from C.sub.1-C.sub.20 linear alkyl, C.sub.1-C.sub.20 alkoxy, C.sub.1-C.sub.20 thioalkyl, C.sub.3-C.sub.20 branched alkyl, C.sub.3-C.sub.20 cyclic alkyl, C.sub.3-C.sub.20 branched alkoxy, C.sub.3-C.sub.20 cyclic alkoxy, C.sub.3-C.sub.20 branched thioalkyl, C.sub.3-C.sub.20 cyclic thioalkyl, C.sub.6-C.sub.20 aryl and C.sub.2-C.sub.20 heteroaryl; and a is an integer from 0 to 2.

2. Organic electronic device according to claim 1, wherein A is unsubstituted.

3. Organic electronic device according to claim 1, wherein, in case that L is substituted, the respective substituents are independently selected from phenyl, naphthyl, pyridyl, bi-phenylyl, dibenzofuranyl, dibenzothiophenyl and carbazolyl.

4. Organic electronic device according to claim 1, wherein, in case of L being C.sub.2-C.sub.42 heteroaryl, the C.sub.2-C.sub.42 heteroaryl is selected from the group consisting of triazine, pyrimidine, benzoacridine, dibenzoacridine, pyridine, bi-pyridine, benzimidazole, phenanthroline, benzo-nitrile, phenanthridine, benzooxazole, benzothiazole, phenanthridine-one, naphto-benzofurane, di-naphtofurane, benzo-naphto-thiophene, and dinaphtothiophene.

5. Organic electronic device according to claim 1, wherein in case of L being C.sub.6-C.sub.24 aryl, the C.sub.6-C.sub.24 aryl is selected from the group consisting of anthracene, phenanthrene, pyrene, fluoranthene and triphenylene.

6. Organic electronic device according to claim 1, wherein, in case that L is substituted, the substituents are independently selected from the group consisting of ##STR00108## ##STR00109##

7. Organic electronic device according to claim 1, wherein the layer comprising the compound of Formula (I) consists of at least one compound of Formula (I).

8. Organic electronic device according to claim 1, wherein the layer comprising the compound of Formula (I) further comprises a metal, a metal salt or an organic metal complex.

9. Organic electronic device according to claim 1 further comprising an emission layer, wherein the layer comprising the compound of Formula (I) is arranged between the emission layer and the cathode.

10. Organic electronic device according to claim 1, wherein the device further comprises an electron transport layer and the layer comprising the compound of Formula (I) is arranged between the electron transport layer and the cathode.

11. Compound according to the general Formula (I) ##STR00110## wherein in the above Formula (I) all positions which are not linked to a -(A).sub.a-L moiety at a * position may be bound to hydrogen or a substituent selected from the group consisting of deuterium, fluorine, RF, C.sub.1-C.sub.20 linear alkyl, C.sub.3-C.sub.20 branched alkyl, C.sub.1-C.sub.12 linear fluorinated alkyl, CN, RCN, C.sub.6-C.sub.20 aryl, C.sub.2-C.sub.20 heteroaryl, (PO)R.sub.2; wherein each R is independently selected from C.sub.1-C.sub.20 linear alkyl, C.sub.1-C.sub.20 alkoxy, C.sub.1-C.sub.20 thioalkyl, C.sub.3-C.sub.20 branched alkyl, C.sub.3-C.sub.20 cyclic alkyl, C.sub.3-C.sub.20 branched alkoxy, C.sub.3-C.sub.20 cyclic alkoxy, C.sub.3-C.sub.20 branched thioalkyl, C.sub.3-C.sub.20 cyclic thioalkyl, C.sub.6-C.sub.20 aryl and C.sub.2-C.sub.20 heteroaryl; A is selected from substituted or unsubstituted C.sub.6-C.sub.24 aryl or substituted or unsubstituted C.sub.2-C.sub.20 heteroaryl, wherein in case that the group A is substituted, the respective substituents are independently selected from the group consisting of deuterium, fluorine, C.sub.1-C.sub.20 linear alkyl, C.sub.3-C.sub.20 branched alkyl, linear fluorinated C.sub.1-C.sub.12 alkyl, CN, C.sub.6-C.sub.20 aryl, C.sub.2-C.sub.20 heteroaryl; L is selected from the group consisting of substituted or unsubstituted C.sub.2-C.sub.42 heteroaryl, substituted or unsubstituted C6-C24 aryl or a group selected ##STR00111## wherein, in case that L is substituted, the respective substituents are selected from the group consisting of Deuterium, fluorine, C.sub.1-C.sub.20 linear alkyl, C.sub.3-C.sub.20 branched alkyl, C.sub.3-C.sub.20 cyclic alkyl, C.sub.1-C.sub.20 linear alkoxy, C.sub.3-C.sub.20 branched alkoxy, linear fluorinated C.sub.1-C.sub.12 alkyl, linear fluorinated C.sub.1-C.sub.12 alkoxy, C.sub.3-C.sub.12 branched fluorinated cyclic alkyl, C.sub.3-C.sub.12 fluorinated cyclic alkyl, C.sub.3-C.sub.12 fluorinated cyclic alkoxy, CN, RCN, C.sub.6-C.sub.20 aryl, C.sub.2-C.sub.20 heteroaryl, OR, SR, (CO)R, (CO)NR2, SiR.sub.3, (SO)R, (SO).sub.2R, (PO)R.sub.2; wherein each R is independently selected from C.sub.1-C.sub.20 linear alkyl, C.sub.1-C.sub.20 alkoxy, C.sub.1-C.sub.20 thioalkyl, C.sub.3-C.sub.20 branched alkyl, C.sub.3-C.sub.20 cyclic alkyl, C.sub.3-C.sub.20 branched alkoxy, C.sub.3-C.sub.20 cyclic alkoxy, C.sub.3-C.sub.20 branched thioalkyl, C.sub.3-C.sub.20 cyclic thioalkyl, C.sub.6-C.sub.20 aryl and C.sub.2-C.sub.20 heteroaryl; and a is an integer from 0 to 2, a) wherein in case of a being 0 L is selected from C.sub.2 to C.sub.42 heteroaryl and the Formula (I) comprises only one moiety -(A).sub.a-L; and in case of L being a N-containing heteroaryl, the C.sub.2-C.sub.42 heteroaryl is selected from the group consisting of triazine, benzoacridine, dibenzoacridine, bi-pyridine, benzimidazole, phenanthroline, phenathridine, benzothiazole, phenanthridinone; b) wherein in case of a being 1 (i) if A is aryl and L is N-containing heteroaryl, the N-containing heteroaryl is substituted or unsubstituted triazine, pyrimidine, benzoacridine, dibenzoacridine, pyridine, bi-pyridine, phenanthroline, phenanthridine or phenanthridinone; (ii) if A is heteroaryl and L is aryl A is selected from the group triazine, pyrimidine, benzoacridine, dibenzoacridine, pyridine, bi-pyridine, benzimidazole, phenanthroline, benzo-nitrile, phenanthridine, benzooxazole, benzothiazole, phenanthridine-one, naphto-benzofurane, di-naphtofurane, benzo-naphto-thiophene, dinaphtothiophene; (iii) if A is heteroaryl and L is heteroaryl A is selected from triazine, pyrimidine, benzoacridine, dibenzoacridine, bi-pyridine, benzimidazole, phenanthroline, benzo-nitrile, phenanthridine, benzooxazole, benzothiazole, phenanthridine-one, naphto-benzofurane, di-naphtofurane, benzo-naphto-thiophene and dinaphtothiophene; c) wherein in case of a being 2, in case that both A and L are aryl, the A directly bound to the group L is anthracenyl; and in case of A being a sulphur containing heteroaryl, the heteroaryl is selected from benzo-naphtho-thiophene, dinaphtothiophene and benzothiazole.

12. Organic semiconducting layer comprising the compound according to claim

13. Display device comprising the organic electronic device according to claim 1.

14. Lightning device comprising the organic electronic device according to claim 1.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0187] These and/or other aspects and advantages of the present invention will become apparent and more readily appreciated from the following description of the exemplary embodiments, taken in conjunction with the accompanying drawings, of which:

[0188] FIG. 1 is a schematic sectional view of an organic light-emitting diode (OLED), according to an exemplary embodiment of the present invention;

[0189] FIG. 2 is a schematic sectional view of an OLED, according to an exemplary embodiment of the present invention.

[0190] FIG. 3 is a schematic sectional view of a tandem OLED comprising a charge generation layer, according to an exemplary embodiment of the present invention.

DETAILED DESCRIPTION

[0191] Reference will now be made in detail to the exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The exemplary embodiments are described below, in order to explain the aspects of the present invention, by referring to the figures.

[0192] Herein, when a first element is referred to as being formed or disposed on or onto a second element, the first element can be disposed directly on the second element, or one or more other elements may be disposed there between. When a first element is referred to as being formed or disposed directly on or directly onto a second element, no other elements are disposed there between.

[0193] FIG. 1 is a schematic sectional view of an organic light-emitting diode (OLED) 100, according to an exemplary embodiment of the present invention. The OLED 100 includes a substrate 110, an anode 120, a hole injection layer (HIL) 130, a hole transport layer (HTL) 140, an emission layer (EML) 150, an electron transport layer (ETL) 160. The electron transport layer (ETL) 160 is formed on the EML 150. Onto the electron transport layer (ETL) 160, an electron injection layer (EIL) 180 is disposed. The cathode 190 is disposed directly onto the electron injection layer (EIL) 180.

[0194] Instead of a single electron transport layer 160, optionally an electron transport layer stack (ETL) can be used.

[0195] FIG. 2 is a schematic sectional view of an OLED 100, according to another exemplary embodiment of the present invention. FIG. 2 differs from FIG. 1 in that the OLED 100 of FIG. 2 comprises an electron blocking layer (EBL) 145 and a hole blocking layer (HBL) 155.

[0196] Referring to FIG. 2, the OLED 100 includes a substrate 110, an anode 120, a hole injection layer (HIL) 130, a hole transport layer (HTL) 140, an electron blocking layer (EBL) 145, an emission layer (EML) 150, a hole blocking layer (HBL) 155, an electron transport layer (ETL) 160, an electron injection layer (EIL) 180 and a cathode electrode 190.

[0197] FIG. 3 is a schematic sectional view of a tandem OLED 200, according to another exemplary embodiment of the present invention. FIG. 3 differs from FIG. 2 in that the OLED 100 of FIG. 3 further comprises a charge generation layer (CGL) and a second emission layer (151).

[0198] Referring to FIG. 3, the OLED 200 includes a substrate no, an anode 120, a first hole injection layer (HIL) 130, a first hole transport layer (HTL) 140, a first electron blocking layer (EBL) 145, a first emission layer (EML) 150, a first hole blocking layer (HBL) 155, a first electron transport layer (ETL) 160, an n-type charge generation layer (n-type CGL) 185, a hole generating layer (p-type charge generation layer; p-type GCL) 135, a second hole transport layer (HTL) 141, a second electron blocking layer (EBL) 146, a second emission layer (EML) 151, a second hole blocking layer (EBL) 156, a second electron port layer (ETL) 161, a second electron injection layer (EIL) 181 and a cathode 190.

[0199] While not shown in FIG. 1, FIG. 2 and FIG. 3, a sealing layer may further be formed on the cathode electrodes 190, in order to seal the OLEDs 100 and 200. In addition, various other modifications may be applied thereto.

[0200] Hereinafter, one or more exemplary embodiments of the present invention will be described in detail with, reference to the following examples. However, these examples are not intended to limit the purpose and scope of the one or more exemplary embodiments of the present invention.

[0201] The features disclosed in the foregoing description, in the claims and/or in the accompanying drawings may, both separately and in y combination thereof, be material for realizing the invention in diverse forms thereof.

EXPERIMENTAL PART

[0202] Synthesis of Compound of Formula 1

3-bromo-spiro[benzo[de]anthracene-7,9-fluorene was Synthesized Following Literature Procedure (J.-Y. Kim et al., Dyes and Pigments 2012, 94, 304-313).

[0203] ##STR00099##

4,4,5,5-tetramethyl-2-(spiro[benzo[de]anthracene-7,9-fluoren]-3-yl)-1,3,2-dioxaborolane

[0204] ##STR00100##

[0205] A flask was flushed with nitrogen and charged with 3-bromo-spiro[benzo[de]thracene-7,9-fluorene (34.2 g, 76.8 mmol), bis(pinacolato)diboron (29.2 g, 115.2 mmol), potassium acetate (22.6 g, 230.4 mmol), and Pd(dppf)Cl.sub.2 (2.2 g, 3.0 mmol). Deaerated 1,4-dioxane (700 mL) was added and the reaction mixture was heated to 100 C. under a nitrogen atmosphere for 18 h. After cooling down to room temperature, ethyl acetate was added and the organic layer filtered through a pad of Celite. The organic solvent was removed under reduced pressure, the solid was dissolved in dichloromethane and filtered through a pad of silica gel. After rinsing with a mixture of dichloromethane/n-hexane (4:6), the combined filtrates were concentrated under reduced pressure. The obtained solid was triturated with a mixture of dichloromethane/n-hexane (5:95), isolated by suction filtration, washed with additional n-hexane, and dried in vacuo to afford 26.8 g (71%) of a pale yellow solid. HPLC: .sub.99%.

2-(dibenzo[b,d]furan-3-yl)-4-phenyl-6-(spiro[benzo[de]anthracene-7,9-fluoren]-3-yl)-1,3,5-triazine (Compound A-1)

[0206] ##STR00101##

[0207] A flask was flushed with nitrogen and charged with 2(4-chlorophenyl)-4-(dibenzo[b,d]furan-3-yl)-6-phenyl-1,3,5-triazine (11.0 g, 31.0 mmol), 4,4,5,5-tetramethyl-2-(3,4,5-triphenyl-[1,1:2,1-terphenyl]-4-yl)-1,3,2-dioxaborolane (15.2 g, 31.0 mmol), K.sub.2CO.sub.3 (12.8 g, 93.0 mmol), and Pd(PPh.sub.3).sub.4 (1.8 g, 1.5 mmol). A mixture of deaerated 1,4-dioxane/water (4.5:1, 245 mL) was added and the reaction mixture was heated to 90 C. under a nitrogen atmosphere for 18 h. After cooling down to room temperature, ethyl acetate was added and the organic layer washed with water, dried over Na.sub.2SO.sub.4, and the organic solvent removed under reduced pressure. The crude product was dissolved in dichloromethane and filtered through a pad of silica gel. After rinsing with a mixture of dichloromethane in n-hexane (a gradient from 10 to 30%), the combined filtrates were concentrated under reduced pressure. The obtained precipitate was triturated with n-hexane, isolated by suction filtration, and washed with additional n-hexane. After recrystallization from THF and drying in vacuo 14.7 g (69%) of a pale yellow solid were obtained. Final purification was achieved by sublimation. HPLC/ESI-MS: 100%, m/z=688 ([M+H].sup.+).

2,4-diphenyl-6-(4-(spiro[benzo[de]anthracene-7,9-fluoren]-3-yl)phenyl)-1,3,5-triazine (Compound A-5)

[0208] ##STR00102##

[0209] A flask was flushed with nitrogen and charged with 2(4-bromophenyl)-4,6-diphenyl-1,3,5-triazine (3.6 g, 9.2 mmol), 4,4,5,5-tetramethyl-2-(3,4,5-triphenyl-[1,1:21-terphenyl]-4-yl)-1,3,2-dioxaborolane (5.0 g, 10.0 mmol), K.sub.2CO.sub.3 (3.8 g, 27.7 mmol), and Pd(PPh.sub.3).sub.4 (0.3 g, 0.3 mmol). A mixture of deaerated 1,4-dioxane/water (2.8:1, 54 mL) was added and the reaction mixture was heated to 90 C. under a nitrogen atmosphere for 18 h. After cooling down to room temperature, the resulting precipitate was isolated by suction filtration. The crude product was dissolved in toluene, the organic phase washed with water, and dried over MgSO.sub.4. The resulting filtrate was filtered through a pad of silica gel, and the solvent removed under reduced pressure. The obtained solid was dried in vacuo to afford 3.4 g (56%) of a white solid. Final purification was achieved by sublimation. HPLC/ESI-MS: 99.9%, m/z=674 ([M+H].sup.+).

[0210] Melting Point

[0211] The melting point (mp) is determined as peak temperatures from the DSC curves of the above TGA-DSC measurement or from separate DSC measurements (Mettler Toledo DSC822e, heating of samples from room temperature to completeness of melting with heating rate 10 K/min under a stream of pure nitrogen. Sample amounts of 4 to 6 mg are placed in a 40 L Mettler Toledo aluminum pan with lid, a <1 mm hole is pierced into the lid).

[0212] Glass Transition Temperature

[0213] The glass transition temperature (Tg) is measured under nitrogen and using a heating rate of 10 K per min in a Mettler Toledo DSC 822e differential scanning calorimeter as described in DIN EN ISO 11357, published in March 2010.

[0214] Reduction Potential

[0215] The reduction potential is determined by cyclic voltammetry with potentiostatic device Metrohm PGSTAT30 and software Metrohm Autolab GPES at room temperature. The redox potentials given at particular compounds were measured in an argon de-aerated, dry 0.1M THF solution of the tested substance, under argon atmosphere, with 0.1M tetrabutylammonium hexafluorophosphate supporting electrolyte, between platinum working electrodes and with an Ag/AgCl pseudo-standard electrode (Metrohm Silver rod electrode), consisting of a silver wire covered by silver chloride and immersed directly in the measured solution, with the scan rate 100 mV/s. The first run was done in the broadest range of the potential set on the working electrodes, and the range was then adjusted within subsequent runs appropriately. The final three runs were done with the addition of ferrocene (in 0.1M concentration) as the standard. The average of potentials corresponding to cathodic and anodic peak of the studied compound, after subtraction of the average of cathodic and anodic potentials observed for the standard Fc.sup.+/Fc redox couple, afforded finally the values reported above. All studied compounds as well as the reported comparative compounds showed well-defined reversible electrochemical behaviour.

[0216] Dipole Moment, LUMO Level, HOMO Level

[0217] The dipole moment |{right arrow over ()}| of a molecule containing N atoms is given by:

[00002]$\stackrel{.fwdarw.}{}=\underset{i}{\overset{N}{.Math.}}.Math.q_i.Math.\stackrel{.fwdarw.}{r_i}$$.Math.\stackrel{.fwdarw.}{}.Math.=\sqrt{{}_x^2+{}_y^2+{}_z^2}$

[0218] where q.sub.i and {right arrow over (r)}.sub.i are the partial charge and position of atom i in the molecule.

[0219] The dipole moment is determined by a semi-empirical molecular orbital method.

[0220] The geometries of the molecular structures are optimized using the hybrid functional B3LYP with the 6-31G* basis set as implemented in the program package TURBOMOLE V6.5. If more than one conformation is viable, the conformation with the lowest total energy is selected to determine the bond lengths of the molecules.

[0221] DFT calculations using the program package TURBOMOLE V6.5 are also used in conjunction with the optimized molecular geometries to determine the HOMO and LUMO energy levels of the molecular structures using the hybrid functional B.sub.3LYP with a 6-31G* basis set. If more than one conformation is viable, the conformation with the lowest total energy is selected.

[0222] Provider: TURBOMOLE GmbH, Litzenhardtstrasse 19, 76135 Karlsruhe, Germany

[0223] General Procedure for Fabrication of OLEDs

[0224] For top emission OLED devices, inventive examples and comparative examples, a glass substrate was cut to a size of 50 mm 50 mm 0.7 mm, ultrasonically cleaned with isopropyl alcohol for 5 minutes and then with pure water for 5 minutes, and cleaned again with UV ozone for 30 minutes, to prepare a first electrode. 100 nm Ag were deposited as anode at a pressure of 10.sup.5 to 10.sup.7 mbar to form the anode.

[0225] Then, 92 vol.-% Biphenyl-4-yl(9,9-diphenyl-9H-fluoren-2-yl)-[4(9-phenyl-9H-carbazol-3-yl)phenyl]-amine (CAS 1242056-42-3) with 8 vol.-% 2,2,2-(cyclopropane-1,2,3-triylidene)tris(2-(p-cyanotetrafluorophenyl)acetonitrile) was vacuum deposited on the ITO electrode, to form a HIL having a thickness of 10 nm. Then, Biphenyl-4-yl(9,9-diphenyl-9H-fluoren-2-yl)-[4-(9-phenyl-9H-carbazol-3-yl)phenyl]-amine was vacuum deposited on the HIL, to form a HTL having a thickness of 118 nm.

[0226] Then, N,N-bis(4-(dibenzo[b,d]furan-4-yl)phenyl)[1,1:4,1-terphenyl]-4-amine (CAS 1198399-61-9) was vacuum deposited on the HTL, to form an electron blocking layer (EBL) having a thickness of 5 nm.

[0227] Then, the emission layer was deposited. 97 vol.-% H09 (Fluorescent-blue host material, Sun Fine Chemicals) as EML host and 3 vol.-% BD200 (Sun Fine Chemicals) as fluorescent blue dopant were deposited on the EBL, to form a blue-emitting EML with a thickness of 20 nm.

[0228] Then, 2,4-diphenyl-6-(4,5,6-triphenyl-[1,1:2,1:3, 1-quinquephenyl]-3-yl)-1,3,5-triazine (CAS 2032364-64-8) was deposited as the hole blocking layer on the emission layer with a thickness of 5 nm. Then, for example-2 a compound of Formula 1 was co-deposited with lithium quinolate (LiQ), according to table 4, in a wt % ratio of 1:1 on the emission layer to form the electron transporting layer with a thickness of 31 nm. For comparative example-2 comparative compound-1 was co-deposited with lithium quinolate (LiQ), according to table 4, in a wt % ratio of 1:1 on the emission layer to form the electron transporting layer with a thickness of 31 nm.

[0229] Then, for both top emission OLED devices of configuration A and B the electron injection layer is formed on the electron transporting layer by deposing Yb with a thickness of 2 nm.

[0230] Ag is evaporated at a rate of 0.01 to 1 /s at 10.sup.7 mbar to form a cathode with a thickness of 11 nm.

[0231] A cap layer of Biphenyl-4-yl(9,9-diphenyl-9H-fluoren-2-yl)-[4-(9-phenyl-9H-carbazol-3-yl)phenyl]amine is formed on the cathode with a thickness of 75 nm.

[0232] Overview of Compounds used (Non-inventive and Non-comparative)

TABLE-US-00002 IUPAC name Reference Biphenyl-4-yl(9,9-diphenyl-9H-fluoren-2-yl)- US2016322581 [4-(9-phenyl-9H-carbazol-3-yl)phenyl]-amine (CAS 1242056-42-3) 4,4,4-((1E,1E,1E)-cyclopropane-1,2,3- US2008265216 triylidenetris(cyanomethanylylidene))tris(2,3,5,6- tetrafluorobenzonitrile) N,N-bis(4-(dibenzo[b,d]furan-4-yl)phenyl)- JP2014096418 [1,1:4,1-terphenyl]-4- amine (CAS 1198399-61-9) H09 (Fluorescent-blue host material) Commercially available from Sun Fine Chemicals, Inc, S. Korea BD200 (Fluorescent-blue emitter material) Commercially available from Sun Fine Chemicals, Inc, S. Korea 2,4-diphenyl-6-(4,5,6-triphenyl- WO2016171358 [1,1:2,1:3,1:3,1-quinquephenyl]- 3-yl)-1,3,5-triazine (CAS 2032364-64-8) 8-Hydroxyquinolinolato-lithium (850918-68-2) = WO2013079217 LiQ

[0233] The OLED stack is protected from ambient conditions by encapsulation of the device with a glass slide. Thereby, a cavity is formed, which includes a getter material for further protection.

[0234] To assess the performance of the inventive examples compared to the prior art, the current efficiency is measured at 20 C. The current-voltage characteristics are determined using a Keithley 2635 source measure unit by sourcing a voltage in V and measuring the current in mA flowing through the device under test. The voltage applied to the device is varied in steps of 0.1V in the range between 0V and 10V. Likewise, the luminance-voltage characteristics and CIE coordinates are determined by measuring the luminance in cd/m.sup.2 using an Instrument Systems CAS-140CT array spectrometer, which has been calibrated by Deutsche Akkreditierungsstelle (DAkkS) for each of the voltage values. The cd/A efficiency at 10 mA/cm.sup.2 is determined by interpolating the luminance-voltage and current-voltage characteristics, respectively.

[0235] In top emission devices, the emission is forward-directed, non-Lambertian and also highly dependent on the micro-cavity. Therefore, the external quantum efficiency (EQE) and power efficiency in lm/W will be higher compared to bottom emission devices.

Technical Effect of the Invention

[0236] Material Property

[0237] The Tg values are in a range suitable for use in organic electronic devices. Higher Tg values of materials used in organic electronics are generally preferred for device durability and robustness. The Tg of both compounds A-1 and A-5 (Table 2) are significantly increased over the Tg of the comparative compound-1 (Table 1).

[0238] Table 3 shows that the HOMO and LUMO energy levels and the dipole moments of compound A-1 and compound A-5 of Formula 1 and of the comparative compound-1. The values are in a range suitable for use as hole blocking materials or electron transporting materials in organic electronic devices.

[0239] Top Emission Devices

[0240] Surprisingly, the lifetime of top emission OLED devices is increased when using compound A-1 of Formula (instead of the comparative compound-1) mixed with the additive LiQ, as an electron transport layer. At the same time, the operating voltage of top emission OLED devices is improved when using compound A-5 or at comparable level when using compound A-1 of Formula 1 as an electron transport host material in a 1:1 mixture with LiQ, in the electron transport layer instead of the comparative compound-1.

[0241] Table .sub.4 shows the operating voltage and lifetime (.sub.97% value) of top emission OLED devices comprising an electron transport layer comprising a 1:1 wt % mixture of a compound of Formula 1 and LiQ.

[0242] In summary, improved performance of top emission OLED devices can be achieved by compo of Formula 1.

Experimental Data (Overview)

[0243]

TABLE-US-00003 TABLE 1 Properties of comparative compounds Compound Tg Tm TRO name Structure ( C.) ( C.) ( C.) Comparative compound-1 [00103] 113 228

TABLE-US-00004 TABLE 2 Properties of compounds of Formula 2 Compound of Tg Tm TRO Formula 1 Structure ( C.) ( C.) ( C.) Compound A-1 [00104] 165 303 266 A-5 [00105] 166 311 272

TABLE-US-00005 TABLE 3 Energy levels and dipole moments of comparative compound and compounds of Formula 1 HOMO LUMO Dipole moment Compound name (eV) * (eV) * (Debye) * Comparative 5.80 1.85 0.51 compound-1 Compound A-1 5.42 2.02 1.27 Compound A-5 5.30 1.91 0.60 * Values calculated with B3LYP_Gaussian / 6-31G*, gas phase

TABLE-US-00006 TABLE 4 Operating voltage of top emission organic electroluminescent devices comprising a 1:1 wt % mixture of compound of Formula 1 with LiQ in the electron transport layer of layer thickness 31 nm. Mixing Lifetime Material of ratio Voltage (97%) electron (wt-%) (volt) at (hours) at transport with 10 30 layer LiQ CIEy mA / cm.sup.2 mA / cm2 Comparative Comparative 1:1 0.046 3.58 31 example 2 compound 1 Example 2 Compound 1:1 0.051 3.74 92 A-1 Example 3 Compound 1:1 0.047 3.47 34 A-5