Organic micro-molecular electron transport material and preparation thereof, and n-doped electron transport layer and application thereof

Abstract

The invention belongs to the technical field of electron transport materials and discloses an organic micro-molecular electron transport material and preparation thereof, and an n-doped electron transport layer and application thereof. The organic micro-molecular electron transport material has a structure shown as the formula I. The preparation method of the organic micro-molecular electron transport material comprises (1) subjecting 2-chloro-4, 6-diphenyl-1, 3, 5-triazine and 3-bromo-phenylboronic acid to coupling reaction, and then performing subsequent processing to obtain a bromine-containing intermediate; (2) subjecting the bromine-containing intermediate and bis-(pinacolato)-diboron to Suzuki reaction and then performing subsequent processing to obtain a borate intermediate; (3) subjecting the borate intermediate and 3-bromo-1, 10-phenanthroline to coupling reaction and performing subsequent processing to obtain the organic micro-molecular electron transport material. The organic micro-molecular electron transport material is simple in structure and high in thermostability and topographic stability; when n-doped, the organic micro-molecular electron transport material can beprepared into the n-doped electron transport layer, which achieves high luminous efficiency and stability when applied to organic electroluminescence devices.

Description

technical field [0001] The invention belongs to the technical field of electron transport materials, and relates to an organic small molecule electron transport material with a simple structure and a preparation method thereof, an n-doped electron transport layer and its application in photoelectric devices such as high-efficiency and high-stability organic light-emitting diodes . Background technique [0002] Electron transport materials are crucial for organic light-emitting diodes (OLEDs). In OLED devices, the introduction of the electron transport layer prevents the cathode from directly contacting the light-emitting layer, thereby avoiding the resulting quenching of light emission. [0003] In order to meet the application requirements, organic molecular electron transport materials are usually required to have excellent thermal stability, film formation and film morphology stability, deep LUMO energy level and good electron mobility. A high glass transition temperatu...

AI Technical Summary

Problems solved by technology

[0004] So far, a large number of organic molecular electron transport materials (~10 –4 –10 –3 cm 2 ·V -1 ·s -1 ), but there are challenges in the synthesis and purification of these materials (H. Fujimoto et al., Influence of material impurities in the hole-blocking layer on the lifetime of organic light-emitting diodes, Appl. Phys. Lett. 2016, volume 109, article number 243302)

[0005] In addition, in organic phosphorescent complex OLED devices, hole transport is usually dominant, so there is a serious Polaron (polaron)-exciton (triplet exciton) annihilation phenomenon, which affects stability

Images