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Phosphorescence host material, and preparation method and application thereof

A technology of phosphorescent main body and light-emitting layer, which is applied in the field of phosphorescent main material and organic electroluminescence, which can solve the problems of low material utilization rate and high cost, and achieve good film-forming performance, good solubility, and good thermal stability sexual effect

Inactive Publication Date: 2013-04-03
东莞彩显有机发光科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, in terms of device fabrication, due to the high cost of the vacuum evaporation process and the low utilization rate of materials

Method used

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  • Phosphorescence host material, and preparation method and application thereof
  • Phosphorescence host material, and preparation method and application thereof
  • Phosphorescence host material, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Example 1: A phosphorescent host material, namely 3-[3-(2-benzothiazolyl)phenyl]-6-diphenylphosphine-9-(4-tert-butylphenyl)-carbazole The preparation method, its reaction process is as follows:

[0047]

[0048]

[0049] Concrete reaction steps are:

[0050] ①Preparation of 9-(4-tert-butylphenyl)-carbazole: Add 7.06g carbazole, 10g 4-tert-butyl iodobenzene, 0.73g cuprous iodide, 0.101g18-crown-6 and 10.62 g potassium carbonate, 5ml 1,3-dimethyl-3,4,5,6-tetrahydro-2-pyrimidinone (DMPU) mixed and stirred, under the protection of nitrogen, heated to 170 ° C for 21 hours; then the reaction solution Cool to room temperature, pour into water, extract with 150ml of dichloromethane, wash with saturated brine three times (50ml×3), separate the organic phase and dry with anhydrous magnesium sulfate, filter, and rotary evaporate to remove the dichloromethane to obtain 9- Crude product of (4-tert-butylphenyl)-carbazole; hot washing with ethanol, and suction filtration to ob...

Embodiment 2

[0057] Example 2: LUMO and HOMO energy level analysis of compound1

[0058] UV absorption and fluorescence emission and cyclic voltammetry tests were carried out on compound1, from Figure 4 The HOMO=-6.0eV of compound1 can be obtained from the cyclic voltammetry spectrum, and then from image 3 The LUMO=-2.6eV of compound1 can be obtained from the ultraviolet absorption spectrum, which can prove the better electron affinity and ion potential of compound1.

Embodiment 3

[0059] Example 3: Application of a phosphorescent host material that can be used in a solution process in organic electroluminescent devices. and imidazole units.

[0060] Table 1: Reported materials and materials of the present invention used in the preparation of devices

[0061]

[0062]

[0063] Devices made of the phosphorescent host material with bipolar carrier transport capability:

[0064] The material used for the anode layer is ITO;

[0065] The material used for the hole injection layer is PEDOT:PSS;

[0066] The light-emitting layer is composed of a host material and a green light-doped light-emitting material, wherein the host material is the compound1 prepared in Example 1 of the present invention, and the green light-doped light-emitting material is Ir(ppy) 3 ;

[0067] The material used for the electron transport layer is ET-15;

[0068] The material used for the electron injection layer is LiF;

[0069] The material used for the cathode layer is A...

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Abstract

The invention discloses a phosphorescence host material, and a preparation method and applications thereof, and relates to the field of organic electroluminescence. The phosphorescence host material comprises carbazole with hole transmittability, and diphenylphosphine oxide / benzothiazole with electronic transmittability. The general structural formula of the phosphorescence host material is figured as follows; the phosphorescence host material has favorable heat stability, hole transmittability and economic transmittability at the same time; hole transmission and electronic transmission are balanced in a light-emitting layer, so that the light-emitting service life and the efficiency of the device are improved; the prepared photoelectric material has higher triplet-state energy level, and effectively prevents the energy from being transmitted back to the host material during the light-emitting process; and when the ninth position of carbazole is tert-butyl benzene and the third position of carbazole is diphenylphosphine oxide / benzothiazole derivate, the compound has good dissoluvability in an organic solvent, and is good in film-forming property.

Description

technical field [0001] The invention relates to the field of organic electroluminescence materials, in particular to a phosphorescent host material, and also relates to a preparation method of the host material and its application in the field of organic electroluminescence. Background technique [0002] In the past two decades, organic light-emitting diodes (OLEDs) have attracted widespread attention because of their high-efficiency, low-voltage drive, easy large-area fabrication, and full-color display, which have broad application prospects. Since 1987, Tang et al. of Kodak Corporation of the United States adopted a sandwich device structure in the patent US4356429, and the developed OLED device has a luminous brightness of 1000cd / m2 driven by a 10V DC voltage. 2 OLED has made great progress since then. [0003] In OLED phosphorescent devices, the light-emitting layer often adopts a host-guest doped structure, part of the energy is transferred from the phosphorescent hos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/6558H01L51/54
Inventor 颜培坚殷正凯黄俊赵伟明
Owner 东莞彩显有机发光科技有限公司
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