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Organic Electroluminescent Devices

An electroluminescent device and electroluminescent technology, which can be used in electric solid devices, electrical components, semiconductor devices, etc., can solve the problems of difficulty in preparation and storage, short life, luminescence quenching, etc., and achieve improved electron injection capability and long life. , the effect of improving the luminous efficiency

Active Publication Date: 2019-04-23
GUAN YEOLIGHT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation and storage of such active functional metals are difficult, and affect the preparation process of devices
Another way to improve the electron injection ability is to add an electron injection layer composed of an inorganic compound between the cathode and the organic layer. Practice has proved that LiF / Al is a cathode structure with excellent electron injection ability and is widely used in OLED products. However, the presence of halogen atoms will quench the luminescence, and the material exhibits greater toxicity, and the film formation temperature of the material is high, and the film thickness of the formed electron injection layer is strictly required; LiAlO 2 , Li 2 CO 3 Short life and low efficiency when used as injection layer material

Method used

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  • Organic Electroluminescent Devices
  • Organic Electroluminescent Devices
  • Organic Electroluminescent Devices

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] refer to figure 1 , is a cross-sectional view of the structure of the organic electroluminescent device in this embodiment. The organic electroluminescent device includes a substrate 10, an anode layer 20, a hole transport layer 30, a light-emitting layer 40, a cathode interface modification layer 50, and a cathode layer 60 arranged in sequence. . Wherein the above-mentioned hole transport layer 30, luminescent layer 40, and cathode interface modification layer 50 are referred to as the organic functional layer part in the present invention, of course, in some devices, a hole injection layer can also be added before the hole transport layer, or An organic electron-blocking layer or hole-blocking layer, and an electron-transporting layer are added before and after the light-emitting layer. This is just to illustrate the experimental results, so a simpler device structure is used for comparison and description. The material and thickness of each layer of the organic ele...

Embodiment 2

[0043] The structure of the organic electroluminescent device of this embodiment is the same as that of embodiment 1, and the material and thickness of each layer of the organic electroluminescent device in this embodiment are as follows:

[0044] Glass substrate / ITO / NPB(50nm) / Alq 3 (70nm) / LiC 60 (0.5nm) / Al(150nm).

[0045] The preparation process of the organic electroluminescent device of this embodiment is the same as that of embodiment 1, except that a 0.5 nm thick LiC 60 .

Embodiment 3

[0047] The structure of the organic electroluminescent device of this embodiment is the same as that of embodiment 1, and the material and thickness of each layer of the organic electroluminescent device in this embodiment are as follows:

[0048] Glass substrate / ITO / NPB(50nm) / Alq 3 (70nm) / LiC 60 (1.0nm) / Al(150nm).

[0049] The preparation process of the organic electroluminescent device of this embodiment is the same as that of embodiment 1, except that a 1.0 nm thick LiC 60 .

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Abstract

The invention discloses an organic light-emitting device, which comprises a substrate, an anode layer, an organic functional layer and a cathode layer, wherein a cathode interface modification layer comprising a compound MxZy is also arranged between the organic functional layer and the cathode layer; M is an active metal element of a main group I or a main group II or a lanthanide active metal element; Z is an element of a main group IV; and x and y are positive integers. According to the organic light-emitting device disclosed by the invention, through addition of the cathode interface modification layer comprising the compound formed by the active metal element and the element of the main group IV, the electron injection capability of the organic light-emitting device is greatly improved, so that the light-emitting efficiency of the organic light-emitting device is significantly improved; and the service lifetime of the obtained organic light-emitting device is relatively long.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescence, in particular to an organic electroluminescence device. Background technique [0002] As early as the 1950s, Bernanose.A et al. started research on organic electroluminescent devices (OLEDs). The material initially studied was an anthracene single wafer. Due to the problem that the thickness of a single wafer is too thick (10-20μm), the required driving voltage is very high (hundreds of volts). In 1982, Vinceet made a 50nm-thick anthracene film by vacuum evaporation, and observed blue fluorescence at a voltage of 30 volts, but its external quantum efficiency was only 0.03%. Early organic electroluminescence hovered at the level of high voltage, low brightness, and low efficiency. Until 1987, Deng Qingyun (C.W.Tang) and Vanslyke of Eastman Kodak Company in the United States reported an organic small molecule electroluminescent device with the structure: ITO / Diamine / Alq3 / Mg:A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/50H01L51/54
Inventor 张国辉李曼朱映光胡永岚
Owner GUAN YEOLIGHT TECH CO LTD