Conjugation arborization electroinduced ethereal blue light material, preparation method and application thereof

Abstract

The invention provides a pure blue light material of a conjugated branchlike molecular and an organic electroluminescence device by using the blue light material as an emitting layer. The blue light material of the invention is a conjugated branchlike molecule, which takes a trimeric indene as a nuclear and a trans 1, 2-stilbene as a bridge; the blue light material is obtained through Homer-Wadsworth-Emmons reaction or Wittig reaction of three phosphonate and single-aldehyde derivative of the trimeric indene; conjunction length and molecular weight of the material are rapidly increased, and emission of the pure blue light and film forming capability of the material are correspondingly regulated. Furthermore, the branchlike structure of the material and an replaced alkyl chain effectively reduce molecular aggregation, thereby obtaining high-purity blue light. By using the conjugated branchlike molecular as the emitting layer material of the organic electroluminescence diode device, the organic electroluminescence diode device can be prepared by simple spin coating process and membrane making; the invention can successfully emit the pure light, with good photoelectric stability.

Description

technical field [0001] The invention relates to the field of organic electroluminescent materials, in particular to a new class of stable conjugated dendritic molecular materials, which can be used as pure blue light materials in the light-emitting layer of organic electroluminescent diodes (OLEDs). Background technique [0002] In recent years, organic light-emitting diode (OLED) has gradually become an important development direction in the field of flat-panel display. more attention. In OLED devices, holes are injected from the anode and electrons are injected from the cathode under an electric field, and the excitons are recombined in the organic light-emitting layer, and finally the excitons are withdrawn to emit visible light. Generally, good organic light-emitting materials must have high quantum efficiency, good film-forming properties, and excellent optical and electrical stability. OLED light-emitting materials can be divided into two categories according to the ...

AI Technical Summary

Problems solved by technology

And the polymer blue light material that appears at first is polyparaphenylene (PPP), but because solubility and stability are poor, have limited the development of this kind of molecule, subsequently appeared the blue light material of many soluble polyparaphenylene derivatives, but they still poor stability

At the beginning of the emergence of polyfluorene polymer blue light materials, it has received widespread attention. However, due to the long-wavelength emission (in the green light emitting region) of high polyfluorene or oligomeric fluorene materials under electric field conditions, the device The color purity is reduced, which also restricts the development of polyfluorene materials

At the end of the last century, people began to use conjugated dendrimers to prepare blue light materials. Conjugated dendrimers based on 1,2-stilbene are among the better blue light materials. However, such dendrimers are only available in Higher algebra can reduce the formation of exciplexes, which undoubtedly greatly increases the cost of materials. Moreover, the best blue light materials in this type of dendrimers are obviously insufficient in luminous brightness and color purity.

Images