蓝光热激活延迟荧光分子设计策略概述  

An Overview of Molecular Design Strategies for Blue Thermally Activated Delayed Fluorescence

作　　者：陶伟[1] 崔林松 TAO Wei;CUI Linsong(Department of Polymer Science and Engineering,University of Science and Technology of China,Hefei 230026,China)

机构地区：[1]中国科学技术大学高分子科学与工程系,合肥 230026

出　　处：《功能高分子学报》2023年第3期240-260,共21页Journal of Functional Polymers

基　　金：国家自然科学基金青年项目(52103242);中国科学技术大学青年创新重点基金项目(YD2060002026)。

摘　　要：热激活延迟荧光(thermally activated delayed fluorescence,TADF)分子由于三重态上的激子可以通过反向系间窜越到单重态并辐射发出荧光,因此在有机发光二极管(organic light-emitting diode,OLED)中理论上可以实现100%的激子利用率。具有TADF特性的发光材料融合了第一代荧光材料和第二代磷光材料的优点,不仅可以实现100%的内量子效率,还有助于降低器件的材料成本,被誉为第三代OLED发光材料,并成为突破高效稳定蓝光OLED瓶颈的潜在解决方案。本文从发光机理出发,系统阐述了高效稳定蓝光TADF分子的设计策略,包括高荧光量子产率、短延迟荧光寿命、窄发射光谱半峰宽、显著的水平分子取向和良好的光电稳定性等。本文旨在为高性能蓝光TADF分子的开发提供理论支持。最后,总结了当前蓝光TADF材料存在的问题,并对其未来的发展前景进行了展望。Recent developments have shown that purely organic molecules exploiting thermally activated delayed fluorescence(TADF)in organic light-emitting diodes(OLEDs)can utilize non-emissive triplet excitons for light emission through reverse intersystem crossing(RISC)processes.As a result,the exciton utilization efficiencies of TADF-based OLEDs can approach 100%.The electroluminescent molecule with TADF characteristics combines the advantages of the first-generation fluorescent emitters and the second-generation phosphorescent emitters by realizing 100%internal quantum efficiencies while reducing the material cost for commercialization.TADF materials now represent the third-generation of OLED emitters and offer an effective approach to breaking through the bottleneck of blue OLEDs.In this review,we focus on the development of high-performance blue TADF molecules,systematically elaborating on the design strategy of efficient and stable blue TADF molecules.Our discussion includes the achievement of high photoluminescence quantum yield,short excition lifetime,narrow full width half maximum,good molecular horizontal orientation and excellent stability.We aim to provide a scientific basis for the development of high-efficiency and stable blue TADF molecules.Additionally,we include an overview of outstanding issues and the research prospects of blue TADF molecules.We hope that this review contributes to the advancement of the field and provides insight into the design of high-performance blue TADF materials.

关 键 词：热激活延迟荧光 有机电致发光二极管 蓝光材料 分子设计 反向系间窜越 

分 类 号：TB34[一般工业技术—材料科学与工程]