摘要
十年来,作为第三代有机发光二极管(organic light-emitting diodes, OLED)发光材料的热活化延迟荧光(thermally activated delayed fluorescence, TADF)材料备受学术界和产业界的广泛关注. TADF分子由于单重态与三重态之间的能级差较小,当受到环境热激活时,三重态激子可以通过反系间窜越转化为单重态,从理论上讲,可以实现100%的激子利用率.这一特性使得OLED器件外量子效率显著提高.溶液加工法具有成本低、方法简单、材料利用率高、可大面积生产等优势,是柔性及印刷OLED器件制备工艺的理想候选.具有良好的电荷传输能力的主体材料能有效降低激子密度和促进能量高效传递.利用自主体TADF材料制备的溶液加工型器件能有效平衡载流子传输和提升器件性能,同时在使用过程中可避免相分离,保持薄膜的均匀性和提高器件的稳定性.本综述总结了溶液加工型自主体TADF材料的研究进展.首先介绍了TADF材料的基本原理和研究意义,强调了溶液加工型自主体TADF材料在显示器件和照明器件等方面的应用潜力.然后详细讨论了溶液加工型自主体TADF材料的不同分类(小分子、树枝状和聚合物)、材料结构及器件性能等方面的研究进展.最后,分别从自主体TADF材料当前的不足、存在的问题和可能解决方案等方面对其发展趋势进行了展望.本综述旨在为相关领域的研究人员提供参考,并促进TADF材料的进一步发展和应用.
Over the past decade,thermally activated delayed fluorescence(TADF)materials have gained widespread attention within both the academic and industrial domains as the third-generation organic light-emitting diode(OLED)emitters.TADF molecules exhibit a small energy gap between the lowest singlet and triplet excited states(ΔEST),thereby facilitating the conversion of triplet excitons to singlet states through reverse intersystem crossing(RISC)upon thermal activation.This characteristic presents the theoretical possibility of achieving 100%exciton utilization,thereby substantially enhancing the external quantum efficiency of OLED devices.Solution processing offers several advantages,such as low cost,simple methods,high material utilization,and large-scale production,rendering it an ideal candidate for the fabrication of flexible and printable OLED devices.The host material with excellent charge transfer capabilities can effectively reduce exciton density and facilitate efficient energy transfer.Consequently,solution-processed devices constructed using self-host TADF materials can effectively balance charge carrier transport and avoid phase separation,thereby maintaining film uniformity,enhancing device performance and improving device stability.This review provides a comprehensive summary of the advancements made in the field of solution-processed self-host TADF materials.First,the basic principles and research significance of TADF materials are introduced,highlighting the potential applications of solution-processed self-host TADF materials in display and lighting devices.Subsequently,an overview of the current research progress on various classifications of solution-processed self-host TADF materials,including small molecules,dendrimers,and polymers are presented.Special emphasis is placed on elucidating the material structures and their performance within devices.Finally,a future outlook is provided regarding the development trend of self-host TADF materials,including their current deficiencies,existing issues,and
作者
刘振宇
饶俊峰
祝守加
王兵洋
余帆
冯全友
解令海
Liu Zhenyu;Rao Junfeng;Zhu Shoujia;Wang Bingyang;Yu Fan;Feng Quanyou;Xie Linghai(State Key Laboratory of Organic Electronics and Information Displays&Institute of Advanced Materials(IAM),Nanjing University of Posts&Telecommunications,Nanjing 210023)
出处
《化学学报》
SCIE
CAS
CSCD
北大核心
2023年第7期820-835,共16页
Acta Chimica Sinica
基金
江苏省自然科学基金(No.BK20190090)
有机电子与信息显示国家重点实验室(No.GZR2022010020)资助。
关键词
有机发光二极管
热活化延迟荧光
溶液加工
自主体
非掺杂
organic light-emitting diode
thermally activated delayed fluorescence
solution-processed
self-host
non-doped
