A kind of organic electroluminescent device and preparation method thereof

An electroluminescent device and luminescent technology, which is applied in the direction of electric solid-state devices, semiconductor/solid-state device manufacturing, electrical components, etc., can solve the influence of high refractive index scattering layer flatness, insufficient light output efficiency, and photoresist refraction. Low efficiency and other problems, to achieve good flatness, improve the refractive index, and improve the light output efficiency

Active Publication Date: 2016-06-29
GUAN YEOLIGHT TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the applicant later discovered that, in the scattering layer prepared by the above method, at the interface where the scattering layer and the light-emitting layer meet, due to the relatively low refractive index of the photoresist, when the light beam enters the scattering layer from the light-emitting layer, There will be total reflection at the interface where the layers meet, part of the light cannot be output, and the light output efficiency is not high enough; in addition, the flatness of the prepared high refractive index scattering layer will also be affected to a certain extent by using single-size scattering particles

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  • A kind of organic electroluminescent device and preparation method thereof
  • A kind of organic electroluminescent device and preparation method thereof
  • A kind of organic electroluminescent device and preparation method thereof

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Embodiment 1

[0062] This embodiment provides an organic electroluminescence device, comprising a substrate 1 and a scattering layer 2, a first electrode 3, an organic functional layer 4 and a second electrode 5 sequentially formed on the substrate 1, and the scattering layer 2 is composed of The following components are prepared: first particle size scattering particles: 18 parts by weight; second particle size scattering particles: 9 parts by weight; dispersant: 8 parts by weight; photoresist: 60 parts by weight; The particle size ratio of the first-size scattering particles and the second-size scattering particles is 20:1.

[0063] A method for preparing the above-mentioned organic electroluminescent device is provided in this embodiment, comprising the following steps:

[0064] S1: cleaning and drying the substrate 1;

[0065] S2: forming a scattering layer 2 on the substrate 1;

[0066] S3: forming a first electrode 3, an organic functional layer 4 and a second electrode 5 by vapor d...

Embodiment 2

[0092] This embodiment makes the following improvements on the basis of Embodiment 1. In this embodiment, when preparing the scattering layer 2, the scattering particles with the first particle size are selected as ZrO 2 , whose particle size is 800nm, accounting for 10 parts by weight; the second particle size scattering particles are selected as ZrO 2 , whose particle size is 50nm, accounts for 30 parts by weight; titanium dioxide dispersant, accounts for 20 parts by weight;

[0093] Propylene glycol methyl ether acetate is as organic solvent, and weight selection is 70g;

[0094] In this embodiment, the thickness of the scattering layer is 0.3 μm.

Embodiment 3

[0096] This embodiment makes the following improvements on the basis of embodiment 1. The method for preparing the scattering layer 2 provided by this embodiment includes the following steps:

[0097] S2A: Select the scattering particles with the first particle size to be SiO 2 , whose particle size is 200nm, accounting for 60 parts by weight; the second particle size scattering particles are selected as SiO 2 , its particle size is 1nm, accounting for 5 parts by weight; the titanium dioxide dispersant is: 60 parts by weight;

[0098] The selected photoresist is ZEOCOAT photoresist, 50 parts by weight, and the light transmittance of the photoresist is 80%;

[0099] Described organic solvent selects propylene glycol methyl ether acetate, and the weight selection is 50g;

[0100] S2B, using a filter paper with a filter pore diameter of 0.9 μm to press filter the grinding dispersion to obtain a membrane-forming solution;

[0101] S2C, the film forming solution is spin-coated o...

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Abstract

The invention relates to an organic light-emitting device and a preparation method thereof, wherein the organic light-emitting device comprises a scatter layer. Materials of the scatter layer comprise, by weight, 10-60 parts of first particle diameter scatter particles, 5-30 parts of second particle diameter scatter particles, 1-60 parts of dispersing agent, and 0-60 parts of photoresist. A particle diameter ratio of the first particle size scatter particles and the second particle size scatter particles is 4: 1-800: 1. The scheme is adopted so as to effectively improve light output efficiency of the organic light-emitting device and effectively improve evenness of a scatter film.

Description

technical field [0001] The invention relates to the technical field of organic electroluminescent devices, in particular to an organic electroluminescent device and a preparation method thereof. Background technique [0002] OLED (Organic Light-Emitting Diode) is an organic light-emitting diode. A light-emitting unit is arranged on a substrate. The light-emitting unit includes two electrodes, and an organic electroluminescent material layer is arranged between the two electrodes. In the prior art, transparent glass is generally selected as the substrate, and the refractive index of the glass is generally 1.4-1.5, and the refractive index of the organic electroluminescent material layer is generally 1.7-1.8. Therefore, when the light emitted by the organic electroluminescent material is energized and enters the air through the glass, due to the principle of total reflection, most of the light will be confined in the organic electroluminescent material layer, which will greatl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L51/52H01L51/54H01L51/56
Inventor 邱勇董艳波张国辉段炼
Owner GUAN YEOLIGHT TECH CO LTD
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