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Preparation method of efficient blue-light polyfluorene spherocrystal material

A technology of spherulite and blue light, which is applied in the field of preparation of high-efficiency blue light polyfluorene spherulite materials, can solve problems affecting device luminescence stability and device service life, and achieve good thermal stability

Inactive Publication Date: 2020-05-08
苏州朗和电子科技有限公司
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Problems solved by technology

However, organic light-emitting diodes with poly-9,9-dioctylfluorene materials as the light-emitting layer will emit green light bands between 510nm and 580nm after long-term use, and this defect seriously affects the light emission of the device. Stability and Device Lifetime

Method used

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  • Preparation method of efficient blue-light polyfluorene spherocrystal material
  • Preparation method of efficient blue-light polyfluorene spherocrystal material
  • Preparation method of efficient blue-light polyfluorene spherocrystal material

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[0032] see Figure 1-3 , the present invention provides a technical solution: a method for preparing a high-efficiency blue-light polyfluorene spherulite material. The specific preparation steps of the high-efficiency blue-light polyfluorene spherulite material are as follows:

[0033] S1: Preparation of polymerized monomers:

[0034] a: Preparation of lactone from 2,7-dibromo-9-fluorenone by Bayer-Villiger rearrangement;

[0035] b: Lactone is prepared by Grignard reaction to 2,7-dibromodiol;

[0036] c: Alkyl substitution reaction of the 4th alcohol group of 2,7-dibromodiol;

[0037] d: The product of the previous step is produced by the Friedel-Crafts reaction as the main polymer monomer;

[0038] S2: Preparation of polymer: take equal amounts of bipyridine and nickel catalyst Ni(COD) 2 to fill N 2 In a two-necked flask, activate it in a DMF solution at 75°C for 20min, then add the polymerized monomer solution dissolved in toluene, reflux at 85°C for 3 days, then end-c...

Embodiment

[0049] The specific preparation steps of the preparation method of the high-efficiency blue light polyfluorene spherulite material are as follows:

[0050] S1: Preparation of polymerized monomers:

[0051] a: Prepare lactone from 2,7-dibromo-9-fluorenone by Bayer-Villiger rearrangement reaction, take 2.8g (8.28mmol) of 2,7-dibromofluorenone and dissolve it in 30ml of dry dichloromethane In, then add 25ml trifluoroacetic acid. Under ice bath conditions, add sodium percarbonate Na every 15min 2 CO 4 1g, 5 times in total. Then return to room temperature and stir for 72h, after the reaction is complete, use sodium bicarbonate NaHCO 4 The remaining trifluoroacetic acid was removed, extracted with dichloromethane and then purified with petroleum ether:dichloromethane (5:1) silica gel column to obtain a light yellow powdery solid (yield 85%);

[0052] b: 2,7-dibromodiol was prepared from lactone by Grignard reaction. First, take 12ml of bromobenzene and magnesium chips (1.76g, 72...

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Abstract

The invention belongs to the technical field of organic photoelectric materials and information display, and particularly relates to a preparation method of an efficient blue-light polyfluorene spherocrystal material. The preparation method of the efficient blue-light polyfluorene spherocrystal material comprises the following steps: S1, preparing a polymerization monomer; S2, preparing a polymer;S3, preparing the polymer spherocrystal. Thermogravimetric analysis and differential thermal analysis tests on the polymer material prove that the polymer photoelectric functional material shows goodthermal stability, electrochemical properties represented by cyclic voltammetry show that the oxidation potential is not obviously changed, and good electroluminescent ability of 9,9-diarylfluorene is maintained; and the method for growing the conjugated polymer PEODPF into the spherocrystal is provided on the basis of material preparation, so PLEDs and an organic laser obtain stable dark blue emission, and the material can be used as an efficient and stable blue light host material in the display fields of polymer organic light-emitting diodes and the like.

Description

technical field [0001] The invention relates to the technical field of organic photoelectric materials and information display, in particular to a preparation method of a high-efficiency blue light polyfluorene spherulite material. Background technique [0002] Information technology is one of the core areas of modern science and technology, and information display technology is an important part of it. Since the Tang Research Group of Kodak Company of the United States in 1987 and Friend and Heeger of the Cavendish Laboratory of the University of Cambridge in 1990 invented small molecules and polymer electroluminescent diodes (OLED / PLED) respectively, due to their low preparation costs , rich material types, high structural selectivity, adjustable performance, simple preparation process, low-cost manufacturing, biocompatibility, device miniaturization, ultra-thin flexibility, etc., have become a research hotspot. At present, polymer organic semiconductors have been widely ...

Claims

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Application Information

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IPC IPC(8): C08G61/10
CPCC08G61/10C08G2261/11C08G2261/1424C08G2261/18C08G2261/3142C08G2261/95C08G2261/592C08G2261/5222
Inventor 林进义
Owner 苏州朗和电子科技有限公司
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