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Non-conjugated fluorescent polymer compound with space charge transfer effect, preparation method and organic electroluminescent device thereof

A technology of polymer compounds and electroluminescent materials, applied in the fields of electric solid-state devices, chemical instruments and methods, electrical components, etc., can solve the problems of long emission wavelength, difficulty in realizing blue light, and low fluorescence quantum efficiency

Active Publication Date: 2019-07-02
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are few types of polymer materials with TADF properties, and they emit light through the form of intramolecular charge transfer. To a large extent, it is necessary to use twisted structure or vertical conformation to separate HOMO and LUMO to obtain a smaller ΔEST, which brings about the problem of small radiative transition rate constant and low fluorescence quantum efficiency of the material, which affects the device. performance improvement

Method used

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  • Non-conjugated fluorescent polymer compound with space charge transfer effect, preparation method and organic electroluminescent device thereof
  • Non-conjugated fluorescent polymer compound with space charge transfer effect, preparation method and organic electroluminescent device thereof
  • Non-conjugated fluorescent polymer compound with space charge transfer effect, preparation method and organic electroluminescent device thereof

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preparation example Construction

[0092] The present invention provides a method for preparing a non-conjugated fluorescent polymer compound according to any one of the above technical solutions, including the following steps:

[0093] 1) Under a protective atmosphere, the monomer of the structure represented by formula (X), the monomer of the structure represented by formula (Y), the initiator and the organic solvent are mixed and reacted to obtain a non-conjugated fluorescent polymer compound ;

[0094]

[0095] In the present invention, the source of the monomer of the structure shown in (X) and the monomer of the structure shown in formula (Y) is not particularly limited. It can be prepared by conventional preparation methods well known to those skilled in the art or purchased commercially. Those skilled in the art can make selections and adjustments according to application conditions, quality requirements and product requirements.

[0096] In the present invention, the amount of the monomer of the structure re...

Embodiment 1

[0124] The reaction formula is as follows:

[0125]

[0126] Under argon atmosphere, weigh different amounts of D1, A1 and azobisisobutyronitrile (AIBN) in a 25ml Schlenk bottle, add 10ml of tetrahydrofuran (THF) into the bottle, heat up to 50℃, and under argon protection The reaction was stirred for 48 hours, and then cooled to room temperature. The reaction solution was poured into acetone, the precipitated solid was filtered, vacuum dried and then dissolved in dichloromethane, settled in methanol, and vacuum dried again to obtain the desired polymer.

[0127] The polymer compound prepared in Example 1 of the present invention was counted and characterized.

[0128] For m-Ac98-TRZ02: the feed is D1 (0.98mmol), A1 (0.02mmol) and AIBN (0.02mmol), the yield is 69%, the number average molecular weight of the polymer is 35,100g / mol, and the weight average molecular weight is 70,500g / mol, the degree of dispersion (PDI) is 2.01.

[0129] For m-Ac95-TRZ05: D1 (0.95mmol), A1 (0.05mmol) and...

Embodiment 2

[0137] The reaction formula is as follows:

[0138]

[0139] Under argon atmosphere, weigh D2 (0.95mmol), A2 (0.05mmol) and AIBN (0.02mmol) in a 25ml Schlenk flask, add 10ml THF to the flask, heat up to 50℃, and stir for reaction under argon protection. After hours, it was cooled to room temperature, the reaction solution was poured into acetone, the precipitated solid was filtered, vacuum dried and then dissolved in dichloromethane, settled in methanol, and vacuum dried again to obtain the desired polymer compound.

[0140] The polymer compound prepared in Example 2 of the present invention was counted and characterized.

[0141] The yield was 78%, the number average molecular weight of the polymer was 20,500 g / mol, the weight average molecular weight was 40,600 g / mol, and the PDI was 1.98.

[0142] The photophysical properties of the polymer compound prepared in Example 2 of the present invention were detected. See Table 1. Table 1 shows the photophysical properties of the polymer ...

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Abstract

The invention provides a non-conjugated fluorescent polymer compound. The polymer compound has the structure shown in the formula (I), D is an electron donor, and A is an electron acceptor. The invention provides a class of non-conjugated fluorescent polymer compounds with space charge transfer effect, no conjugated unit is connected between the electron donor and the electron acceptor, the chargetransfer between the electron donor and the electron acceptor does not occur through covalent bonds, and the charge transfer is realized through the space effect. The blue light is easily realized because the luminescence wavelength of the polymer based on space charge transfer effect is relatively short. At the same time, the overlap degree between HOMO and LUMO energy levels is very small, andthus the polymer has the relatively small singlet state-triplet state energy difference, thereby the triplet state exciton can be made full use. In addition, the space interaction of the electron clouds of the electron donor and the electron acceptor can occur, so that the fluorescence quantum efficiency is relatively high, and then the high device efficiency can be obtained.

Description

Technical field [0001] The present invention relates to the field of organic light-emitting materials, relates to a non-conjugated fluorescent polymer compound and a preparation method thereof, and an organic electroluminescent device, in particular to a non-conjugated fluorescent polymer compound with space charge transfer effect and a preparation method thereof , Organic electroluminescent devices. Background technique [0002] Organic light-emitting devices (OLEDs) are usually composed of a cathode, an anode, and an organic layer inserted between the cathode and the anode, that is, the composition of the device is a transparent ITO anode, a hole injection layer (TIL), and a hole transport layer (HTL) , The light-emitting layer (EL), the hole blocking layer (HBL), the electron transport layer (ETL), the electron injection layer (EIL) and the cathode are formed, and 1 to 2 organic layers can be omitted as needed. The mechanism of action is that a voltage is formed between the t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F212/14C09K11/06H01L51/50H01L51/54
CPCC08F212/14C09K11/06C09K2211/1466C09K2211/1475C09K2211/1425H10K85/151H10K50/11H10K2101/10
Inventor 王利祥邵世洋王兴东胡军
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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