Device for improving brightness and efficiency of organic electroluminescent device and method for making the same

A technology for light-emitting devices and electroluminescence, which is applied in the fields of electric solid-state devices, semiconductor/solid-state device manufacturing, and electrical components.

Inactive Publication Date: 2008-02-27
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of low efficiency and service life of existing electroluminescent devices due to unbalanced injection and transport of electrons and holes, and to provide an organic electroluminescent device capable of improving luminous brightness and efficiency preparation method

Method used

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  • Device for improving brightness and efficiency of organic electroluminescent device and method for making the same

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Effect test

Embodiment 1

[0030] As shown in Figure 1, the specific structure of the light-emitting device provided by the present invention includes in sequence:

[0031] 1), conductive glass ITO anode layer 1;

[0032] 2), self-assembled single-molecule modified metal nano-dots 2 located on the above-mentioned conductive glass anode layer 1;

[0033] 3), a hole transport layer 3 located on the self-assembled monomolecularly modified metal nanodots 2;

[0034] 5), the light-emitting layer 4 located on the above-mentioned hole transport layer 3;

[0035] 6), the electron transport layer 5 located on the above-mentioned light-emitting layer 4;

[0036] 7) A metal cathode 6 located on the above-mentioned electron transport layer 5 .

[0037] The metal in the aforementioned metal nano-dots is silver (or gold). The diameter of nanodots is between 10-30nm.

[0038] The self-assembled molecule is a thiol with an electron-withdrawing group, the electron-withdrawing group is -F, -CN, or -CF 3 , and the s...

Embodiment 2

[0039] Embodiment 2, the preparation method of organic electroluminescent device

[0040] (1) After repeatedly cleaning the 3mm×3mm ITO glass in detergent, soak it in isopropanol, acetone and chloroform solution respectively and ultrasonically clean it, and finally dry it in an infrared oven for use;

[0041] (2) Ag nano-dots with a diameter of 30 nm were vapor-deposited on the cleaned ITO glass surface by a vacuum evaporation method (see FIG. 3 ). (3) Put the above-mentioned treated ITO glass into a concentration of 1×10 -3 mol / L 4-fluorobenzenethiol in absolute ethanol solution for 0.5h, then take it out, wash it with absolute ethanol three times, and dry it with nitrogen flow. 15nm m-MTDATA, 60nm NPB, and 60nm Alq were sequentially deposited by vacuum evaporation method 3 , 1nm LiF and 100nm Al, in the range of 3.5 ~ 13.5V, stable electroluminescence can be obtained, and the brightness can reach 11830cd / m at 13V 2 ; The luminous efficiency is 3.2cd / A. The highest bright...

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Abstract

This invention relates to the organic electroluminescent component with enhanced ligh-emitting efficiency and brightness; solving the problems of prior art products of lower efficiency and short service life, due to the unbalance between the injection and transmission of electron and hole. In this invention, ITO anode is modified by metal nanometer spots modified by self-package molecules. This inventive component involves successively: an electroconductive glass ITO anode layer, a metal nanometer spots modified by self-package mono-molecules, a hole-transmission layer, a light-emitting layer, an electron-transmission layer, a metal cathode. The method for producing the inventive products is simple and suitable for commercial production.

Description

【Technical field】: [0001] The invention relates to a method for modifying an ITO anode by using metal nano-dots modified by self-assembled monomolecules to improve the luminous brightness and efficiency of devices, and belongs to the technical field of organic electroluminescence. 【Background technique】: [0002] Organic light-emitting diode (OLED) is a brand-new display technology, involving different disciplines such as materials science, luminescence optics and microelectronics, and has outstanding performance in portable, flat panel and flexible displays. Therefore, OLED research can not only drive the development of related disciplines, but also has a huge potential market in the field of flat panel display. Since 1987, C.W.Tang et al reported that the brightness exceeds 1000cd / m 2 Since the double-layer organic thin-film light-emitting device, OLED has increasingly become a hot spot in international research because of its advantages of high luminous brightness, rich ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L51/50H01L51/52H01L51/54H01L51/56
Inventor 杨利营印寿根陈向舟许昊叶丹琴华玉林
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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