摘要
高分子发光材料具有可溶液加工的特点,适于制备低成本、大面积发光器件,在平板显示和固体照明领域具有潜在的应用前景.近年来,高分子发光材料在发光机制、材料体系和器件性能等方面均取得了重要进展,各项性能得到了大幅度提升.本文从材料和器件角度,围绕高分子荧光材料、高分子磷光材料和高分子热活化延迟荧光材料的分子设计策略,总结和评述了高分子荧光材料的颜色调控和效率提升途径,高分子磷光材料的磷光掺杂剂、高分子主体、拓扑结构等因素对发光性能的影响规律,以及高分子热活化延迟荧光材料的设计原理和典型材料体系.同时,分析了高分子发光材料未来发展面临的机遇和挑战.
Electroluminescent polymers hold great promise in penal display and solid-state lighting applications because of their advantages of solution processability,large-scale manufacturing and ability to produce flexible devices based on plastic substrates.In the past decades,great progress has been made in electroluminescent polymers including their working mechanism,material systems and device performance.Basically,electroluminescent polymers can be divided into three classes： fluorescent polymers,phosphorescent polymers and thermally activated delayed fluorescence（TADF） polymers.For fluorescent polymers,the internal quantum efficiency（IQE） is limited to 25% because they can use only singlet excitons in the electroluminescent device.In comparison,IQE of phosphorescent polymers can reach 100% because of the strong spin-orbital coupling induced by the heavy-atoms in the phosphorescent dopants.Recently,TADF polymers have evolved rapidly as the new kind of electroluminescent polymers because they are able to utilize triplet excitons through rapid reverse intersystem crossing process from the lowest triplet state to the lowest singlet state,thereby providing a promising approach to reach 100% IQE without the use of noble metal elements.With these developments,the device performance of the polymers has been enhanced greatly and many indexes have met the commercialization requirements.This review is aimed to summarize the research progresses on electroluminescent polymers used for organic light-emitting diodes,including the molecular design and device performance of representative examples of fluorescent polymers,phosphorescent polymers and TADF polymers.The emphasis of this review is especially focused on the color tuning and performance improvement approaches for the fluorescent polymers,the optimization of the phosphorescent dopant,the polymer host and the topological structure of the phosphorescent polymers,as well as the design principles of the thermally activated delayed fluorescence polymers.Finally,the pe
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
2018年第2期198-216,共19页
Acta Polymerica Sinica
基金
国家自然科学基金(基金号51573182
51203149
91333205)
国家重点基础研究发展计划(973计划
项目号2015CB655000)资助
