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中文摘要：
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.
英文摘要：
The physical and chemical properties of organic semiconductors play key roles in the performance of optoelectronic 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 bulky groups,molecular conformations and topologies of chains and antioxidant hindered amine light stabilizers （HALS）,together with physical blending as well as interface engineering.
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