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Luminous layer of a blue organic electro-luminescent device and the blue organic electro-luminescent device

A light-emitting layer, electroluminescence technology, applied in the direction of electroluminescence light source, electric solid device, electric light source, etc., can solve the problems of low luminous efficiency and service life, and achieve the effect of improving luminous efficiency and service life

Inactive Publication Date: 2008-07-02
深圳市合力泰光电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the luminous efficiency and service life of blue organic electroluminescent devices made of light-emitting layers are relatively low

Method used

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  • Luminous layer of a blue organic electro-luminescent device and the blue organic electro-luminescent device
  • Luminous layer of a blue organic electro-luminescent device and the blue organic electro-luminescent device
  • Luminous layer of a blue organic electro-luminescent device and the blue organic electro-luminescent device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] This example is used to illustrate the light-emitting layer and the blue organic electroluminescent device provided by the present invention.

[0056] On a glass substrate with a thickness of 0.5 mm, etchant (pure water: HCl: HNO 3 =10:20:1 (volume ratio); acid etching solution equivalent concentration: 6.8-7.5N) to etch the ITO anode and lattice pattern with a thickness of 200 nanometers. at 1.3 x 10 -7 Under the pressure of Pa, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer and a cathode layer are sequentially formed on the anode by vacuum evaporation method, and then the back cover is packaged to obtain a blue organic electroluminescence. Light emitting device A1.

[0057] Among them, the above-mentioned hole injection layer is formed of CuPc with a thickness of 50 nanometers; the hole transport layer is formed of NPB with a thickness of 20 nanometers; in the light-emitting layer, the...

Embodiment 2

[0062] This comparative example is used to illustrate the light-emitting layer and the blue organic electroluminescent device provided by the present invention.

[0063] The blue organic electroluminescent device A2 was prepared according to the same method as in Example 1. The difference was that in the light-emitting layer, the host material was ADN, the blue light dopant was TBPe, and the green light dopant was DMQD. The evaporation speed of the three materials is such that the weight ratio of the three is 93:6:0.3, and the thickness of the light-emitting layer is 25 nanometers.

Embodiment 3 and 4

[0065] Examples 3 and 4 are used to measure the properties of the blue organic electroluminescent devices A1 and A2 prepared in Examples 1 and 2, respectively.

[0066] Connect the anode layer and cathode layer of the blue organic electroluminescence device to both ends of the power supply, adjust the voltage value between the anode layer and the cathode layer, so that the blue organic electroluminescence device works at different currents, use PR -705 chroma luminance tester and keithily 238 current and voltage tester measure the brightness and chromaticity of light emitted by blue organic electroluminescent devices under different current conditions, and calculate the luminous efficiency of blue organic electroluminescent devices according to the following formula :

[0067] Luminous efficiency (candela / ampere) = brightness (candela / square meter) / current density (mA / square centimeter) × 0.1

[0068] The results are shown in Table 1.

[0069] At the same time, with the init...

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Abstract

The invention relates to a light-emitting layer used in a blue organic light-emitting device of electrical poling, which comprises material of a blue light body and blue light dopant, wherein the light-emitting layer further includes green light dopant. The invention also provides a blue organic light-emitting device of electrical poling which contains the light-emitting layer. Besides the material of the blue light body and the blue light dopant, the light-emitting layer provided by the invention also comprises the green light dopant which matches with the blue light dopant. Compared with the material of merely containing the blue light dopant, the invention can remarkably improve the light-emitting efficiency and prolong the service life of the blue organic light-emitting device of electrical poling made by adopting the light-emitting layer hereof.

Description

technical field [0001] The invention relates to a light-emitting layer and an organic electroluminescent device, more particularly to a light-emitting layer for a blue organic electroluminescent device and a blue organic electroluminescent device. Background technique [0002] An organic electroluminescent device is a new type of display device, which generally includes a substrate, an anode layer, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer, and a cathode layer in sequence. By applying a certain voltage between the electrodes, the device can emit light. [0003] Blue organic electroluminescent display devices are widely used, except that they can be used as common information display devices. At the same time, according to the principle of three primary colors, blue light emission is the basis for realizing white and color display. The light-emitting layer of a blue organic electroluminesc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/54H01L51/50C09K11/06H05B33/14H05B33/02
Inventor 林秦
Owner 深圳市合力泰光电有限公司