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Novel poly-p-phenylene vinylene electroluminescent materials and method for preparing same

An electroluminescent material, polyphenylene vinylene technology, applied in the direction of light-emitting materials, chemical instruments and methods, etc., can solve the problems of carrier injection rate mismatch, affecting the efficiency of light-emitting devices, obvious interfaces, microcavities, etc., to achieve The reaction conditions are easy to control, not easy to fail, and have good anti-aging performance

Inactive Publication Date: 2007-05-30
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of this structure is very effective in improving the efficiency of organic electroluminescence, but there are still some problems: the increase in the number of device layers will lead to obvious complex effects such as interfaces and microcavities
However, this kind of doping will lead to a low lifetime of the device due to shortcomings such as phase separation and low stability [Tan Haishu, Zou Kaishun, Yao Jianquan, etc., Optoelectronics Laser, 2002, 13(6), 567-570]
Chinese patent, application number 00116212.8 discloses a class of molecularly twisted electroluminescent materials containing carrier transport functional groups, which have achieved good results in practical applications, but there is still room for further improvement
However, the hole transport capacity of PPV is far greater than the electron transport capacity, and the efficiency of light-emitting devices is greatly affected due to the mismatch of carrier injection rate.
For this reason, Yang Xiaohui et al. reported a soluble PPV polymer whose main chain contains electron-transporting groups, which increases the luminous efficiency by 8 times, but the molecular weight of the polymer is too low, which leads to poor film-forming properties and is not easy to use The manufacture of devices is prone to aging and failure; at the same time, the synthesis steps are relatively complicated, which is not conducive to industrialization [Yang Xiaohui, Yin Shougen, Wang Zhenjia, etc., Chemical Journal of Chinese Universities, 2001, 22(5), 847-850]

Method used

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  • Novel poly-p-phenylene vinylene electroluminescent materials and method for preparing same
  • Novel poly-p-phenylene vinylene electroluminescent materials and method for preparing same
  • Novel poly-p-phenylene vinylene electroluminescent materials and method for preparing same

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Example 1: Preparation of oxadiazole derivatives

[0037] In a 250mL three-necked flask equipped with a stirrer, a reflux condenser and a drying tube, add 28.0g of benzoyl hydrazide, 20.3g of isophthaloyl chloride, 100mL of tetrahydrofuran and 18mL of anhydrous pyridine, heat to 65°C, reflux and stir. After 8 hours, cool to room temperature, pour the reaction solution into 1000 mL of ice-water mixture, stir well, let stand and filter, repeatedly wash with ice water and cold ethanol, and vacuum dry to obtain white powder dibenzoyl isophthalic hydrazide 25.3 g.

[0038] Add 20.1g of dibenzoyl isophthalic hydrazide and 50mL of phosphorus oxychloride into a 250mL three-necked flask equipped with a stirrer, reflux condenser and drying tube, heat to 105°C, reflux and stir for 5 hours, and cool to room temperature , Pour the reaction solution into 1000 mL of ice-water mixture, stir well, stand still and filter, wash with distilled deionized water and ethanol in turn, and then recr...

Embodiment 2

[0039] Example 2: Preparation of PPV

[0040] Dissolve 0.02mol of 1,3-bis(5-phenyl)-1,3,4-oxadiazole benzene in dioxane, add 0.025mol of formaldehyde, 0.025mol of paraformaldehyde and 100mL of formaldehyde at room temperature. Concentrated hydrochloric acid, stirred and refluxed for 6h, distilled under reduced pressure to remove the solvent, cooled, filtered and washed with ethanol, and recrystallized to obtain a chloromethylated oxadiazole derivative.

[0041] Dissolve 0.02 mol of the chloromethylated oxadiazole derivative in 180 mL of anhydrous tetrahydrofuran, add an appropriate amount of potassium tert-butoxide in anhydrous tetrahydrofuran solution with stirring until it reaches 2.5 times the molar amount of the monomer, and stir at room temperature After 6 hours, 100 mL of a mixture of methanol and water with a volume ratio of 1:1 was added, filtered, and a red precipitate was separated. After being washed 3 times with ethanol, the PPV was obtained by vacuum drying with a num...

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Abstract

The invention discloses a new-typed polyphenylacetylene electroluminescent material, which is characterized by the following: the host material is composed of organic powder with PPV, which introduces oxdiazole group with main chain containing electron transmitting function; the material mates injecting velocity of carrier, which is fit for industrial course.

Description

Technical field [0001] The invention belongs to the field of fine chemicals, and relates to a type of polymer electroluminescent material containing electron transport functional groups on the main chain, and specifically relates to a poly(p-phenylene vinylene (PPV)) electroluminescent material containing oxadiazole functional groups and The preparation method. Background technique [0002] The research on new organic electroluminescent materials and devices is an emerging and intersecting frontier research field developed in the world following the development of inorganic EL. Compared with inorganic light-emitting devices, this new type of organic display materials and devices has many advantages: high efficiency, high brightness, wide viewing angle, low power consumption, low driving voltage, fast response speed, full color, easy to make super The thin and large area can meet the higher performance and larger information capacity requirements of display devices in the informat...

Claims

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Application Information

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IPC IPC(8): C09K11/06C08F138/02
Inventor 张岱南张怀武李元勋
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA