ORGANIC ELECTROLUMINESCENCE DEVICE HAVING RGB PIXEL AREAS

Abstract

An organic electroluminescence device having RGB pixel areas, wherein optical compensation layers (10, 11) are respectively arranged between the red light emitting layer (4) and the first organic functional layer (12) as well as between the green light emitting layer (5) and the first organic functional layer (12), the optical compensation layers (10, 11) are made of a first hole transport material and a second hole transport material, the first hole transport material has a triplet-state energy level≧2.48 eV and a HOMO energy level≦−5.5 eV, the second hole transport material has a HOMO energy level≧−5.5 eV, and the difference between the HOMO energy level of the first hole transport material and the HOMO energy level of the second hole transport material is ≦0.2 eV. Its preparation process is simple, and it can significantly reduce power consumption of the light-emitting device so as to increase light-emitting efficiency.

Claims

1. An organic electroluminescence device having RGB pixel areas, comprising a substrate, with a first electrode layer (1), a plurality of organic layers and a second electrode layer (8) formed in sequence on the substrate, wherein, the organic layers include a first organic functional layer (12), a light emitting layer and a second organic functional layer (13) arranged upon the first electrode layer (1), the light emitting layer comprises a red light emitting layer (4), a green light emitting layer (5) and a blue light emitting layer (6), wherein, optical compensation layers are respectively arranged between the red light emitting layer (4) and the first organic functional layer (12) as well as between the green light emitting layer (5) and the first organic functional layer (12), the optical compensation layers are made of a first hole transport material and a second hole transport material, the first hole transport material has a triplet-state energy level≧2.48 eV and a HOMO energy level≦−5.5 eV, the second hole transport material has a HOMO energy level>−5.5 eV, and the difference between the HOMO energy level of the first hole transport material and the HOMO energy level of the second hole transport material is ≦0.2 eV.

2. The organic electroluminescence device having RGB pixel areas of claim 1, wherein, the optical compensation layers include a red light optical compensation layer (10) arranged between the red light emitting layer (4) and the first organic functional layer (12), and a green light optical compensation layer (11) arranged between the green light emitting layer (5) and the first organic functional layer (12).

3. The organic electroluminescence device having RGB pixel areas of claim 2, wherein, the first hole transport material and second hole transport material contained in the red light optical compensation layer (10) has a mass ratio of 1:99 to 99:1.

4. The organic electroluminescence device having RGB pixel areas of claim 2, wherein, the first hole transport material and second hole transport material contained in the green light optical compensation layer (11) has a mass ratio of 5:95 to 50:50.

5. The organic electroluminescence device having RGB pixel areas of claim 4, wherein, the first hole transport material and second hole transport material contained in the green light optical compensation layer (11) has a mass ratio of 10:90 to 30:70.

6. The organic electroluminescence device having RGB pixel areas of claim 1, wherein, the first hole transport material has a structure defined by the following structural formula (1) or structural formula (2): ##STR00027## in the structural formula (1), the groups A and B are individually selected from phenyl group, naphthyl group or phenyl-amino group; the groups of R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6, R.sub.7, R.sub.8, R.sub.15, R.sub.16, R.sub.17 and R.sub.18 are identical or different, and are individually selected from hydrogen element, halogen element, CN, NO.sub.2, amino group, C.sub.6-C.sub.30 fused cyclic aryl group, C.sub.6-C.sub.30 fused heterocyclic aryl group, C.sub.6-C.sub.20 alkyl group or C.sub.6-C.sub.30 alcohol group; the groups of R.sub.9, R.sub.10, R.sub.11 and R.sub.12 are identical or different, and are individually selected from C.sub.6-C.sub.30 aryl group; in the structural formula (2), the groups of A1 and A2 are individually selected from C.sub.6-C.sub.30 aryl group or C.sub.6-C.sub.30 heterocyclic aryl group, the group R1′ is selected from hydrogen, alkyl group, alkoxyl group or basic group; and the structural formula (2) also meets the following condition: at least one of the groups of A1 and A2 has a condensed ring structure.

7. The organic electroluminescence device having RGB pixel areas of claim 6, wherein, the first hole transport material has a structure selected from the following structural formulas (HTL1-1) to (HTL1-10): ##STR00028## ##STR00029## ##STR00030##

8. The organic electroluminescence device having RGB pixel areas of claim 1, wherein, the second hole transport material has an indenofluorene structure defined by the following structural formula (3), structural formula (4), structural formula (5) or structural formula (6): ##STR00031## wherein, the groups of A and B are individually selected from phenyl group, naphthyl group or phenyl-amino group; the groups of R.sub.9, R.sub.10, R.sub.11 and R.sub.12 are identical or different, and are individually selected from C.sub.6-C.sub.30 aryl group; the group of R.sub.13 is selected from C.sub.1-C.sub.6 alkyl group or hydroxyl group.

9. The organic electroluminescence device having RGB pixel areas of claim 8, wherein, the group R.sub.13 is methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, n-amyl group or n-hexyl group.

10. The organic electroluminescence device having RGB pixel areas of claim 8, wherein, the second hole transport material has a structure selected from the following structural formulas (HTL2-1) to (HTL2-18): ##STR00032## ##STR00033## ##STR00034## ##STR00035##

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to make the content of the present invention more easy to be understood clearly, hereinafter, detailed description of the present invention is further provided according to specific embodiments of the present invention with reference to the appended drawings, wherein,

[0021] FIG. 1 is a structural schematic diagram of a light-emitting device in prior art;

[0022] FIG. 2 is a structural schematic diagram of another light-emitting device in prior art;

[0023] FIG. 3 is a structural schematic diagram of a light-emitting device of the present invention.

[0024] Wherein, 1-first electrode layer, 2-hole injection layer, 3-hole transport layer, 4-red light emitting layer, 5-green light emitting layer, 6-blue light emitting layer, 7-electron transport layer, 8-second electrode layer, 9-optical coupling layer, 10-red light optical compensation layer, 11-green light optical compensation layer, 12-first organic functional layer, 13-second organic functional layer.

DETAILED DESCRIPTION OF EMBODIMENTS

[0025] In order to make the objective, technical scheme and advantages of the present invention more clear, hereinafter, detailed description of implementation ways of the present invention is given below, with reference to the appended drawings.

[0026] The present invention may be implemented in many different ways, and should not be interpreted to be limited to the embodiments described herein. On the contrary, by providing these embodiments, the present disclosure is made complete and thorough, and the inventive concept of the present invention is sufficiently conveyed to those skilled in the art, wherein the present invention is defined by the claims. In the appended drawings, for the sake of clarity, dimensions and relative sizes of layers and areas might be exaggerated. It should be understood that, when one element such as a layer, an area or a substrate plate is described as “formed on” or “configured on” another element, this one element may be configured directly upon that another element, or there may exist intermediate element(s). On the contrary, when one element is described as “directly formed upon” or “directly configured upon” another element, there exist no intermediate element.

[0027] As shown in FIG. 3, it is a structural schematic diagram of an organic electroluminescence device having RGB pixel areas in accordance with the present invention.

[0028] This organic electroluminescence device having RGB pixel areas comprises a substrate (not shown in the drawing), with a first electrode layer 1 (anode layer), a plurality of organic layers, a second electrode layer 8 (cathode layer) and an optical coupling layer 9 formed in sequence on the substrate, wherein, the organic layers include a first organic functional layer 12, a light emitting layer and a second organic functional layer 13 arranged upon the first electrode layer 1, the light emitting layer comprises a red light emitting layer 4 with a thickness of H.sub.R, a green light emitting layer 5 with a thickness of Ho and a blue light emitting layer 6 with a thickness of Ha, where H.sub.B>H.sub.G>H.sub.R, and optical compensation layers are respectively arranged between the red light emitting layer 4 and the first organic functional layer 12 as well as between the green light emitting layer 5 and the first organic functional layer 12, the optical compensation layers are made of a first hole transport material and a second hole transport material, the first hole transport material has a triplet-state energy level≧2.48 eV and a HOMO energy level≦−5.5 eV, the second hole transport material has a HOMO energy level>−5.5 eV, and the difference between the HOMO energy level of the first hole transport material and the HOMO energy level of the second hole transport material is ≦0.2 eV.

[0029] The optical compensation layers include a red light optical compensation layer 10 arranged between the red light emitting layer 4 and the first organic functional layer 12, and a green light optical compensation layer 11 arranged between the green light emitting layer 5 and the first organic functional layer 12. The first hole transport material and second hole transport material contained in the red light optical compensation layer 10 has a mass ratio of 1:99 to 99:1, preferably 10:90 to 30:70. The first hole transport material and second hole transport material contained in the green light optical compensation layer 11 has a mass ratio of 5:95 to 50:50, preferably 10:90 to 30:70.

[0030] The first hole transport material has a structure defined by the following structural formula (1) or structural formula (2):

##STR00009##

in the structural formula (1), the groups A and B are individually selected from phenyl group, naphthyl group or phenyl-amino group;
the groups of R.sub.1, R.sub.2, R.sub.3, R.sub.4, R5, R.sub.6, R.sub.7, R.sub.8, R.sub.15, R.sub.16, R.sub.17 and R.sub.18 are identical or different, and are individually selected from hydrogen element, halogen element, CN, NO.sub.2, amino group, C.sub.6-C.sub.30 fused cyclic aryl group, C.sub.6-C.sub.30 fused heterocyclic aryl group, C.sub.6-C.sub.20 alkyl group or C.sub.6-C.sub.30 alcohol group;
the groups of R.sub.9, R.sub.10, R.sub.11 and R.sub.12 are identical or different, and are individually selected from C.sub.6-C.sub.30 aryl group;
in the structural formula (2), the groups of A1 and A2 are individually selected from C.sub.6-C.sub.30 aryl group or C.sub.6-C.sub.30 heterocyclic aryl group, the group R1′ is selected from hydrogen, alkyl group, alkoxyl group or basic group;
and the structural formula (2) also meets the following condition: at least one of the groups of A1 and A2 has a condensed ring structure.

[0031] The first hole transport material has a structure selected from the following structural formulas (HTL1-1) to (HTL1-10):

##STR00010## ##STR00011## ##STR00012##

[0032] The second hole transport material has an indenofluorene structure defined by the following structural formula (3), structural formula (4), structural formula (5) or structural formula (6):

##STR00013##

wherein, the groups of A and B are individually selected from phenyl group, napthyl group or phenyl-amino groups;
the groups of R.sub.9, R.sub.10, R.sub.11 and R.sub.12 are identical or different, and are individually selected from C.sub.6-C.sub.30 aryl group;
the group of R.sub.13 is selected from C.sub.1-C.sub.6 alkyl group or hydroxyl group, preferably, the group R.sub.13 is methyl group, ethyl group, propyl group, isopropyl group, butyl group, isobutyl group, n-amyl group or n-hexyl group.

[0033] The second hole transport material has a structure selected from the following structural formulas (HTL2-1) to (HTL2-18):

##STR00014## ##STR00015## ##STR00016## ##STR00017##

[0034] The substrate is selected from a glass substrate or a flexible substrate.

[0035] The first electrode layer 1 (anode layer) can adopt an inorganic material or an organic conducting polymer. The inorganic material is usually a metal oxide, such as indium tin oxide, zinc oxide, indium zinc oxide, or a metal with high work function, such as gold, copper, silver, preferably, it is indium tin oxide (ITO). The organic conducting polymer is preferably selected from Polythiophene/Polyethylene based sodium benzene sulfonate (hereinafter abbreviated as PEDOT:PSS) and Polyaniline (hereinafter abbreviated as PANI).

[0036] The second electrode layer 8 (cathode layer) usually adopts metal, metal compound or alloy with low work function, such as lithium, magnesium, calcium, strontium, aluminum, indium. In the present invention, the electron transport layer 7 is preferably doped with an active metal such as Li, K, Cs which is preferably prepared by evaporation coating of an alkali metal compound.

[0037] The hole injection layer 2 (HIL) has a matrix material that is preferably HAT, 4,4-(N-3-methyl-phenyl-N-phenyl-amino)-triphenylamine (m-MTDATA), 4,4TDAT, or tri-(N-2-naphthyl-N-phenyl-amino)-triphenylamine (2-TNATA).

[0038] The hole transport layer 3 (HTL) has a matrix material that may adopt a low molecular material of the arylamine type or the branched polymer species, preferably N,N-di-(1-naphthyl)-N,N-diphenyl-1,1′-biphenyl-4,4′-diamine (NPB).

[0039] The electron transport layer 7 has a material selected from Alq.sub.3, Bphen, BAlq or selected from the following materials:

##STR00018##

[0040] The blue light emitting layer 6 usually adopts a host material selected from ADN and its derivatives, together with a dye having a molecular structure selected from the following formula (BD-1) or formula (BD-2):

##STR00019##

[0041] The red light emitting layer 4 usually adopts the following material: Ir(piq).sub.3, Ir(piq).sub.2(acac), Btp.sub.2Ir(acac), Ir(MDQ).sub.2(acac), Ir(DBQ).sub.2(acac), Ir(fbi).sub.2(acac), Ir(2-phq).sub.3, Ir(2-phq).sub.2(acac), Ir(bt).sub.2(acac), PtOEP, etc.

[0042] The green light emitting layer 5 usually adopts the following material: Ir(ppy).sub.3, Ir(ppy).sub.2(acac), etc.

[0043] The structural formulas of the main chemical substances in the present invention are explained as follows:

TABLE-US-00001 Abbreviation Structural Formula NPB [00020] HAT [00021] MTDATA [00022] Ir(ppy).sub.3 [00023] Ir(MDQ).sub.2(acac) [00024] ADN [00025] BPhen [00026]

[0044] Some embodiments are given below, for specifically explaining the technical scheme of the present invention with reference to the appended drawings. It should be noted that, the following embodiments are only intended to help understanding the present invention, not to limit the present invention.

[0045] The organic electroluminescence device of Embodiments 1-14 has the following structures, and the differences thereof are different materials used by the red light optical compensation layer 10 and the green light optical compensation layer 11.

[0046] Blue light emitting area 15 (within the leftmost dotted line block in FIG. 3): ITO/HAT(10 nm)/MTDATA(100 nm)/NPB(20 nm)/ADN(30 nm):BD-1/ETL-1(35 nm)/Mg:Ag (20 nm)/MTDATA(50 nm)

[0047] Green light emitting area 14 (within the middle dotted line block in FIG. 3): ITO/HAT(10 nm)/MTDATA(100 nm)/NPB(20 nm)/HTL1:HTL2(60 nm)/CBP(30 nm):Ir(ppy)3/ET L-1(35 nm)/Mg:Ag(20 nm)/MTDATA(50 nm)

[0048] Red light emitting area 13 (within the rightmost dotted line block in FIG. 3): ITO/HAT(10 nm)/MTDATA(100 nm)/NPB(20 nm)/HTL1:HTL2(10 nm)/CBP(30 nm): Ir(mdq)2(acac)/ETL-1(35 nm)/Mg:Ag(20 nm)/MTDATA(50 nm)

Embodiment 1

[0049] Wherein, the first hole transport material HTL1 has a structure as shown by formula HTL-1, and the second hole transport material HTL2 has a structure as shown by formula HTL2-1;

[0050] In the red light optical compensation layer 10, the first hole transport material HTL1-1 and second hole transport material HTL2-1 have a mass ratio of 50:50;

[0051] In the green light optical compensation layer 11, the first hole transport material HTL1-1 and second hole transport material HTL2-1 have a mass ratio of 50:50.

Embodiment 2

[0052] Wherein, the first hole transport material HTL1 has a structure as shown by formula HTL1-2, and the second hole transport material HTL2 has a structure as shown by formula HTL2-2;

[0053] In the red light optical compensation layer 10, the first hole transport material HTL1-2 and second hole transport material HTL2-2 have a mass ratio of 1:99;

[0054] In the green light optical compensation layer 11, the first hole transport material HTL1-2 and second hole transport material HTL2-2 have a mass ratio of 50:50.

Embodiment 3

[0055] Wherein, the first hole transport material HTL1 has a structure as shown by formula HTL1-3, and the second hole transport material HTL2 has a structure as shown by formula HTL2-3;

[0056] In the red light optical compensation layer 10, the first hole transport material HTL1-3 and second hole transport material HTL2-3 have a mass ratio of 99:1;

[0057] In the green light optical compensation layer 11, the first hole transport material HTL1-3 and second hole transport material HTL2-3 have a mass ratio of 95:5.

Embodiment 4

[0058] Wherein, the first hole transport material HTL1 has a structure as shown by formula HTL1-4, and the second hole transport material HTL2 has a structure as shown by formula HTL2-18;

[0059] In the red light optical compensation layer 10, the first hole transport material HTL1-4 and second hole transport material HTL2-18 have a mass ratio of 90:10;

[0060] In the green light optical compensation layer 11, the first hole transport material HTL-4 and second hole transport material HTL2-18 have a mass ratio of 5:95.

Embodiment 5

[0061] Wherein, the first hole transport material HTL1 has a structure as shown by formula HTL1-5, and the second hole transport material HTL2 has a structure as shown by formula HTL2-16;

[0062] In the red light optical compensation layer 10, the first hole transport material HTL1-5 and second hole transport material HTL2-16 have a mass ratio of 70:30;

[0063] In the green light optical compensation layer 11, the first hole transport material HTL1-5 and second hole transport material HTL2-16 have a mass ratio of 15:85.

Embodiment 6

[0064] Wherein, the first hole transport material HTL1 has a structure as shown by formula HTL1-6, and the second hole transport material HTL2 has a structure as shown by formula HTL2-15;

[0065] In the red light optical compensation layer 10, the first hole transport material HTL1-6 and second hole transport material HTL2-15 have a mass ratio of 40:60;

[0066] In the green light optical compensation layer 11, the first hole transport material HTL1-6 and second hole transport material HTL2-15 have a mass ratio of 40:60.

Embodiment 7

[0067] Wherein, the first hole transport material HTL1 has a structure as shown by formula HTL1-7, and the second hole transport material HTL2 has a structure as shown by formula HTL2-14;

[0068] In the red light optical compensation layer 10, the first hole transport material HTL1-7 and second hole transport material HTL2-14 have a mass ratio of 50:50;

[0069] In the green light optical compensation layer 11, the first hole transport material HTL1-7 and second hole transport material HTL2-14 have a mass ratio of 30:70.

Embodiment 8

[0070] Wherein, the first hole transport material HTL1 has a structure as shown by formula HTL1-8, and the second hole transport material HTL2 has a structure as shown by formula HTL2-13;

[0071] In the red light optical compensation layer 10, the first hole transport material HTL1-8 and second hole transport material HTL2-13 have a mass ratio of 35:65;

[0072] In the green light optical compensation layer 11, the first hole transport material HTL 1-8 and second hole transport material HTL2-13 have a mass ratio of 25:75.

Embodiment 9

[0073] Wherein, the first hole transport material HTL1 has a structure as shown by formula HTL1-9, and the second hole transport material HTL2 has a structure as shown by formula HTL2-12;

[0074] In the red light optical compensation layer 10, the first hole transport material HTL1-9 and second hole transport material HTL2-12 have a mass ratio of 90:10;

[0075] In the green light optical compensation layer 11, the first hole transport material HTL-9 and second hole transport material HTL2-12 have a mass ratio of 45:55.

Embodiment 10

[0076] Wherein, the first hole transport material HTL1 has a structure as shown by formula HTL1-10, and the second hole transport material HTL2 has a structure as shown by formula HTL2-11 or HTL2-6;

[0077] In the red light optical compensation layer 10, the first hole transport material HTL1-10 and second hole transport material HTL2-11 have a mass ratio of 45:55;

[0078] In the green light optical compensation layer 11, the first hole transport material HTL1-10 and second hole transport material HTL2-6 have a mass ratio of 10:90.

Embodiment 11

[0079] Wherein, the first hole transport material HTL1 has a structure as shown by formula HTL1-1, and the second hole transport material HTL2 has a structure as shown by formula HTL2-10;

[0080] In the red light optical compensation layer 10, the first hole transport material HTL1-1 and second hole transport material HTL2-10 have a mass ratio of 95:5;

[0081] In the green light optical compensation layer 11, the first hole transport material HTL1-1 and second hole transport material HTL2-10 have a mass ratio of 5:95.

Embodiment 12

[0082] Wherein, the first hole transport material HTL1 has a structure as shown by formula HTL1-3, and the second hole transport material HTL2 has a structure as shown by formula HTL2-9 or HTL2-17;

[0083] In the red light optical compensation layer 10, the first hole transport material HTL1-3 and second hole transport material HTL2-17 have a mass ratio of 55:45;

[0084] In the green light optical compensation layer 11, the first hole transport material HTL-3 and second hole transport material HTL2-9 have a mass ratio of 20:80.

Embodiment 13

[0085] Wherein, the first hole transport material HTL1 has a structure as shown by formula HTL1-5, and the second hole transport material HTL2 has a structure as shown by formula HTL2-8 or HTL2-4;

[0086] In the red light optical compensation layer 10, the first hole transport material HTL1-5 and second hole transport material HTL2-8 have a mass ratio of 55:45;

[0087] In the green light optical compensation layer 11, the first hole transport material HTL1-5 and second hole transport material HTL2-4 have a mass ratio of 20:80.

Embodiment 14

[0088] Wherein, the first hole transport material HTL1 has a structure as shown by formula HTL1-8, and the second hole transport material HTL2 has a structure as shown by formula HTL2-5 or HTL2-7;

[0089] In the red light optical compensation layer 10, the first hole transport material HTL1-8 and second hole transport material HTL2-7 have a mass ratio of 30:70;

[0090] In the green light optical compensation layer 11, the first hole transport material HTL 1-8 and second hole transport material HTL2-5 have a mass ratio of 40:60.

Comparison Example

[0091] Blue light emitting area 15 (within the leftmost dotted line block in FIG. 3): ITO/HAT(10 nm)/MTDATA(100 nm)/NPB(20 nm)/ADN(30 nm):BD-1/ETL-1(35 nm)/Mg:Ag (20 nm)/MTDATA(50 nm)

[0092] Green light emitting area 14 (within the middle dotted line block in FIG. 3): ITO/HAT(10 nm)/MTDATA(160 nm)/NPB(20 nm)/CBP(30 nm):Ir(ppy).sub.3/ETL-1(35 nm)/Mg:Ag(20 nm)/MTDATA(50 nm)

[0093] Red light emitting area 13 (within the rightmost dotted line block in FIG. 3): ITO/HAT(10 nm)/MTDATA(210 nm)/NPB(20 nm)/CBP(30 nm):Ir(mdq).sub.2(acac)/ETL-1 (35 nm)/Mg:Ag(20 nm)/MTDATA(50 nm)

[0094] The test results of the devices are listed below:

TABLE-US-00002 Blue light Green light Red light efficiency efficiency efficiency (cd/A) (cd/A) (cd/A) Embodiment 1 4.3 70.2 29.3 Embodiment 2 4.3 66.3 29.8 Embodiment 3 4.3 69.5 32.1 Embodiment 4 4.3 72.5 30.6 Embodiment 5 4.3 72.1 28.4 Embodiment 6 4.3 67.0 34.2 Embodiment 7 4.3 69.4 30.3 Embodiment 8 4.3 75.1 36.7 Embodiment 9 4.3 65.2 33.1 Embodiment 10 4.3 64.2 27.0 Embodiment 11 4.3 69.0 28.9 Embodiment 12 4.3 65.9 27.0 Embodiment 13 4.3 71.5 33.5 Embodiment 14 4.3 72.2 30.4 Comparison 4.3 63.3 26.9 Example

[0095] As indicated by the test results, because the optical compensation layers is made of a combination of a hole transport material having a high energy level and a material having a high charge transfer rate, the light emitting efficiencies of the red light emitting layer and the green light emitting layer are significantly increased.

[0096] Apparently, the aforementioned embodiments are merely examples illustrated for clearly describing the present invention, rather than limiting the implementation ways thereof. For those skilled in the art, various changes and modifications in other different forms can be made on the basis of the aforementioned description. It is unnecessary and impossible to exhaustively list all the implementation ways herein. However, any obvious changes or modifications derived from the aforementioned description are intended to be embraced within the protection scope of the present invention.