Aggregation-induced delayed fluorescence (AIDF) materials: a new break-through for nondoped OLEDs

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2017,（12）
• 页码范围: 1561-1562
• 页数: 2页
• 语种: 英文

摘要

Nowadays,purely organic materials with delayed fluorescence (DF) are being enthusiastically developed and extensively utilized as light-emitting materials to fabricate OLEDs because of their high exciton utilization and metal-free nature.These DF materials usually have a small single-triplet splitting (AEsr),and the nonradiative triplet excitons (75％)can be converted into radiative singlet excitons via thermally promoted reverse intersystem crossing (RISC) processes,endowing their OLEDs with potential internal quantum efficiencies (IQEs) approaching 100％.Although many OLEDs based on conventional DF emitters have high efficiencies and high maximum brightness,they usually have to face two practical obstacles which frustrate their commercial applications:namely,complicated device architectures with a host-guest doping system as the emitting layer,and serious efficiency roll-off at high luminance.