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Organic electroluminescent device

An electroluminescence device and electroluminescence technology, which are applied in the directions of electroluminescence light source, electric light source, luminescent material, etc., can solve the problems of improving the luminous efficiency and durability of organic EL devices that have not yet been found.

Inactive Publication Date: 2010-09-15
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practice, no organic EL device has been found that achieves improved luminous efficiency and durability by precisely controlling the carrier balance in the light-emitting layer so that the entire light-emitting layer emits light.

Method used

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  • Organic electroluminescent device
  • Organic electroluminescent device
  • Organic electroluminescent device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0199] An ITO film (thickness 100 nm) was formed as an anode on a support substrate (material: glass), and then a vacuum deposition device (1×10 -6 torr), using 2-TNATA (4,4′,4″-tris(2-naphthylphenylamino)triphenylamine) and F4-TCNQ (tetrafluorotetracyano Quinone dimethane) is co-deposited on it to form a hole injection layer with a thickness of 160nm. Subsequently, (N, N'-dinaphthyl-N, N'-diphenyl-[1,1'-biphenyl Base]-4,4'-diamine) as a hole transport layer with a thickness of 10 nm. The structural formulas of 2-TNATA, F4-TCNQ and NPD are as follows.

[0200]

[0201]

[0202] After the hole transport layer is formed, a light emitting layer is stacked thereon. By using mCP (N,N'-dicarbazolyl-3,5-benzene) as the host material with hole transport properties, Pt-1 as the light-emitting material with electron transport properties (blue light-emitting material) and compound A A light-emitting layer formed as a mixed layer (thickness 60 nm) was co-deposited as an electrical...

Embodiment 2

[0218] A blue light-emitting organic EL device having the same layer composition as in Example 1 was fabricated in the same manner as in Example 1, except that silicon oxide was used (inorganic binder) instead of Compound A (organic binder) used in forming the light-emitting layer of Example 1. The concentration profiles of the respective materials in the emitting layer are shown in Figure 4B . The layer configuration of the light-emitting device, the thickness of each layer, and the like are as follows.

[0219] ITO(100nm) / 2-TNATA+1.0%F4-TCNQ(160nm) / NPD(10nm) / 26%→0%mCP+74%inorganic binder+0%→26%Pt-1(60nm) / BAlq (40nm) / LiF(1nm) / Al(100nm)

[0220] The external quantum efficiency and luminance half-life of the obtained organic EL device were measured under the same conditions as in Example 1 (below, the same), and as a result, 360 cd / m 2 The external quantum efficiency is 12.5%, and the brightness half-life is 1800 hours.

Embodiment 3

[0222] An organic EL device having the same layer configuration and thickness as the organic EL device of Example 1 except for the light-emitting layer was produced. The same materials used in Example 1 were used to form the light-emitting layer, so that the concentration distribution of each material was as follows Figure 4C shown. The layer configuration of the light-emitting device, the thickness of each layer, and the like are as follows.

[0223] ITO(100nm) / 2-TNATA+1.0%F4-TCNQ(160nm) / NPD(10nm) / 100%→0%mCP+74%organic binder+0%→26%Pt-1(60nm) / BAlq (40nm) / LiF(1nm) / Al(100nm)

[0224] The external quantum efficiency and luminance half-life of the organic EL device were measured, and the result was 360cd / m 2 The external quantum efficiency is 13.5%, and the brightness half-life is 2000 hours.

[0225] It is considered that when the concentration of the binder in the light-emitting layer gradually decreases from the cathode side toward the anode side, the luminous e...

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Abstract

An organic electroluminescent device 10 has an anode 14, a cathode 18 disposed facing the anode, and an organic layer 16 that is sandwiched between the anode and the cathode and that includes at least a light emitting layer, wherein the light emitting layer includes a light emitting material having electron transportability, a host material having hole transportability and an electrically inert material, and the concentration of the light emitting material having electron transportability gradually decreases from the cathode side toward the anode side. Preferably, the concentration of the electrically inert material also gradually decreases from the cathode side toward the anode side.

Description

technical field [0001] The present invention relates to organic electroluminescent devices. Background technique [0002] In recent years, light emitting devices using organic electroluminescent devices (organic EL devices) have been developed. Figure 6 The configuration of the organic EL device 1 is schematically shown. On a substrate 2 made of glass or the like, an anode 3, an organic EL layer 8 (a hole transport layer 4, a light emitting layer 5, and an electron transport layer 6), a cathode 7, and the like form a laminate. In the drawings, a spacer, an insulating film, a sealing member, and the like are not shown. The two electrodes 3 and 7 are connected to external wiring through electrode lead wiring (terminals). When an electric field is applied to the electrodes, holes and electrons recombine in the light emitting layer 5 in the region sandwiched between the electrodes 3 and 7, thereby emitting light. [0003] In the case of manufacturing a display device capable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50C09K11/06
CPCH05B33/18H01L2251/5346H01L51/005H01L51/0071H01L51/0087H01L2251/308H01L51/0094H01L51/0081H01L51/5012H01L2251/552H10K85/60H10K85/657H10K85/324H10K85/346H10K85/40H10K50/11H10K2101/80H10K2102/103H10K2101/30C09K11/06H10K50/00
Inventor 木下正儿飞世学
Owner FUJIFILM CORP