关于举行台湾大学汪根欉教授学术报告的通知

2017-11-09 69

报告题目：Intramolecular or Intermolecular Charge Transfer Approaches for

Highly Efficient TADF Materials and OLEDs

报告人：汪根欉教授（台湾大学）

邀请人：苏仕健教授

报告时间：2017年11月13日（星期一）上午10:00

地点：发光材料与器件国家重点实验室502

报告摘要：

Thermally activated delayed fluorescence (TADF) organic materials achieved either by subtle manipulations of intramolecular or intermolecular charge transfer and their applications for giving OLEDs with high external quantum efficiency (EQE) will be presented.Organic molecules with efficient thermally activated delayed fluorescence (TADF) are emerging as attractive emitters in OLEDs because of the achievable 100% internal quantum efficiency. In this talk, our recent works on acridine-based TADF materials will be presented.One of this series TADF materials exhibits nearly 100% photoluminescence quantum yield,excellent thermal stability, and a horizontal dipole ratio of 83%, leading to extremely efficient blue organic EL with external quantum efficiency (EQE) of ~37%. In addition, efficient and tunable blue-green to yellow TADF emitters capable of generating OLED EQEs of > 31% are developed adopting acridine as donor unit and CN-substituted benzene, pyridine and pyrimidine as acceptor units will also be reported. These materials permit one to systematically probe the influence of different acceptor strengths and also the influence of tunable conformations (twist angles) within the acceptor moieties through controlling the orientation of asymmetric heteroaromatic ring relative to the donor component. TADF can also be achievedby exciplex formed through intermolecular charge transfer between a hole-transporting material and an electron-transporting material. Some efficient OLEDs based on exciplex system will also be presented.