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Organic electroluminescent element

An electroluminescent element and luminescent technology, which is applied in the direction of electrical components, electric solid devices, circuits, etc., can solve the problems of low luminous rate of devices, difficulty in balancing holes and electrons, etc., and achieve the effect of weakening the interface effect and improving efficiency

Pending Publication Date: 2022-01-04
CHANGZHOU TRONLY EARLY OPTOELECTRONICS MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide an organic electroluminescent element to solve the problem that the holes and electrons of the electroluminescent element in the prior art are difficult to balance, resulting in low luminous efficiency of the device.

Method used

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  • Organic electroluminescent element
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  • Organic electroluminescent element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0086] refer to figure 1 The structure shown is to use Sunic sp1710 vapor deposition machine to manufacture OLED elements. The specific steps are as follows: glass substrates (Corning glass 40mm*40mm*0.7mm) coated with ITO (indium tin oxide, as the anode layer 1) with a thickness of 135nm are respectively Ultrasonic cleaning with isopropanol and pure water for 5 minutes, and then cleaning with ultraviolet ozone, then the glass substrate was transferred to the vacuum deposition chamber; compound 1-1 and compound 2-2 were mixed (the doping mass ratio of compound 2-2 was 4%) vacuum on the transparent ITO electrode (about 10 -7 Torr) thermally deposited a thickness of 20nm to form a hole injection layer 2; on the hole injection layer, then vacuum-deposit compound 1-1 with a thickness of 60nm as the first hole transport layer 3; then vacuum-deposit a compound 3-3 with a thickness of 10nm Form the second hole-transport layer 4; then vacuum-deposit 25nm of compound A doped with a ma...

Embodiment 2

[0091] Experiments were carried out in the same manner as in Example 1, except that Compound 1-3 was used instead of Compound 1-1, Compound 2-4 was used instead of Compound 2-2, Compound 3-6 was used instead of Compound 3-3, Using Compound Compound 4-4 was used instead of Compound 4-1.

[0092] The element structure is expressed as: ITO (135nm) / compound 1-3:4% compound 2-4 (20nm) / compound 1-3 (60nm) / compound 3-6 (10nm) / compound A:4% compound 4- 4 (25nm) / Compound C:LiQ (5:5, 30nm) / Yb (2nm) / Mg:Ag (10:1, 150nm).

Embodiment 3

[0094] Experiments were carried out in the same manner as in Example 1, except that Compound 1-8 was used instead of Compound 1-1, Compound 2-6 was used instead of Compound 2-2, Compound 3-8 was used instead of Compound 3-3, Using Compounds Compound 4-6 was used instead of Compound 4-1.

[0095] The element structure is expressed as: ITO (135nm) / compound 1-8:4% compound 2-6 (20nm) / compound 1-8 (60nm) / compound 3-8 (10nm) / compound A:4% compound 4- 6 (25nm) / Compound C:LiQ (5:5, 30nm) / Yb (2nm) / Mg:Ag (10:1, 150nm).

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Abstract

The invention provides an organic electroluminescent element. The organic electroluminescent element comprises a hole injection layer, a hole transport layer, a light-emitting layer and an electron transport layer which are sequentially stacked, wherein the main body of the light-emitting layer comprises a compound A or a compound B, the compounds A and B are defined in the specification, the electron transport layer comprises a compound C defined in the specification, and the compound C in the electron transport layer of the organic electroluminescent element has the same fragment as the compound A and the compound B in the main body of the light-emitting layer, so that the interfacial effect between film layers is weakened, and electrons can be quickly transmitted to the luminescent layer. According to the invention, the main body material of the light-emitting layer has the bipolar characteristic, so that the transmission capability of holes and electrons is further balanced, and the efficiency of the organic electroluminescent element is obviously improved by integrating the mutual synergistic effect of the substances.

Description

technical field [0001] The invention relates to the technical field of electroluminescence, in particular to an organic electroluminescence element. Background technique [0002] Organic electroluminescent elements have been used in smart phones, tablet computers, vehicles and other fields due to their characteristics of thinness, wide viewing angle, high contrast, low power consumption, high response speed, full-color screen, and flexibility. It is expanding to large-size applications such as TVs. [0003] Organic electroluminescent elements usually include a hole injection layer, a hole transport layer, an electron blocking layer, a light emitting layer, a hole blocking layer, an electron transport layer, an electron injection layer and other film layers. Cathode injection, enters the light-emitting layer through the transport layer and recombines with each other to emit light. The efficiency of the device depends on the recombination probability of holes and electrons. T...

Claims

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Application Information

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IPC IPC(8): H01L51/50H01L51/54
CPCH10K85/654H10K85/6572H10K85/342H10K50/12H10K50/16
Inventor 叶子勤孙霞王仁宗
Owner CHANGZHOU TRONLY EARLY OPTOELECTRONICS MATERIAL CO LTD