CAJ | 학술논문

有机半导体的物理和化学性质直接影响其光电器件的性能,这为物理化学提出了新的研究内容与挑战.其中,聚芴类蓝光二极管的光谱稳定性及低能发射带(LEEB)的起源问题是国际上近十年的热点问题之一.本文系统概述了低能发射带的现象、表征方法以及可能的形成机理,包括链间作用导致的激基缔合物发射、器件制备或降解过程形成的芴酮缺陷发射、芴酮聚集态发射以及聚芴端羟基界面氧化导致的绿光发射.本文综述各种物理掺杂和界面调控改善聚芴类二极管蓝光稳定性的策略,着重论述非平面基团的空间位阻、分子构象与链的拓扑结构以及引入抗氧化受阻胺光稳定剂来提高其光谱稳定性策略.
유궤반도체적물리화화학성질직접영향기광전기건적성능,저위물이화학제출료신적연구내용여도전.기중,취물류람광이겁관적광보은정성급저능발사대(LEEB)적기원문제시국제상근십년적열점문제지일.본문계통개술료저능발사대적현상、표정방법이급가능적형성궤리,포괄련간작용도치적격기체합물발사、기건제비혹강해과정형성적물동결함발사、물동취집태발사이급취물단간기계면양화도치적록광발사.본문종술각충물리참잡화계면조공개선취물류이겁관람광은정성적책략,착중논술비평면기단적공간위조、분자구상여련적탁복결구이급인입항양화수조알광은정제래제고기광보은정성책략.
The physical and chemical properties of organic semiconductors play key roles in the performance of optoclectronic devices.The manipulation of these properties offers research opportunities and challenges in physical chemistry.The spectral stability and the origin of the low-energy emission band(LEEB)in polyfluorenes-based blue light-emitting diodes have received much attention over the past few decades.In this review,we categorized various LEEB phenomena according to characterization and related mechanisms.including inter-chain aggregates and/or excimers,on-chain ketone defect emissions,interchain ketone-based excimers,and hydroxy-terminated oxidation on the interface of devices.Recent advances in highly stable blue light-emitting polyfluorenes are categorically summarized.This review highlighted the contributions of the steric hindrance effects of various nonplanar hulky groups,molecular conformations and topologies of chains and antioxidant hindered amine light stabilizers(HALS),together with physical blending as well as interface engineering.