基于蓝光HLCT材料pCzAnN作敏化主体的单发光层白光有机发光二极管  

Single-emitting Layer White Organic Light-emitting Diodes with Blue HLCT Material of pCzAnN as Sensitizer Host

作　　者：李晓霞 田甜甜 杨睿浩 许慧侠[1] 苗艳勤[1,2] 王华 LI Xiaoxia;TIAN Tiantian;YANG Ruihao;XU Huixia;MIAO Yanqin;WANG Hua(Key Laboratory of Interface Science and Engineering in Advanced Materials,Ministry of Education,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering,Taiyuan 030001,China;College of Textile Engineering,Taiyuan University of Technology,Jinzhong 030600,China)

机构地区：[1]太原理工大学新材料界面科学与工程教育部重点实验室,山西太原030024 [2]山西浙大新材料与化工研究院,山西太原030001 [3]太原理工大学轻纺工程学院,山西晋中030600

出　　处：《发光学报》2024年第11期1747-1757,共11页Chinese Journal of Luminescence

基　　金：山西省科技创新人才团队项目(202204051001013);中央引导地方科技发展资金(YDZJSX2024D021);山西省留学人员科技活动择优资助项目(20230007);国家自然科学基金(62074109,U21A20492);山西-浙大新材料与化工研究院项目(2021SX-FR007)。

摘　　要：有机发光二极管(Organic light-emitting diodes,OLEDs)作为照明和显示领域极其具有竞争力的技术,近年来备受关注。实现超简单、高效率、低滚降的白光OLEDs,对有机发光层材料的选择至关重要。杂化局部和电荷转移(Hybridized local and charge transfer,HLCT)材料的“热激子”通道可以将高能三线态激子窜跃至单线态,实现理论上100%的激子利用率,快速的反向系间窜跃可有效抑制三线态激子猝灭,从而降低器件效率滚降。基于此,本文首先通过电荷平衡策略优化器件结构,制备了基于HLCT材料pCzAnN的高效蓝光OLED。在此基础上,以pCzAnN作为传统荧光材料的敏化主体,通过不完全能量传递策略,实现了双色及三色白光OLEDs制备。制备的白光OLEDs最高显色指数达到90,最大外量子效率达到8.76%,且展现出较低效率滚降及良好的光谱稳定性。本研究对开发简单、高效率、低滚降白光OLEDs具有指导意义。Organic light-emitting diodes(OLEDs)are attracting attention in recent years as a competitive tech⁃nology in the field of lighting and display technology.To realize ultra-simple,efficient and low roll-off white OLEDs,the selection of organic emissive layer materials is crucial.The“hot exciton”channel of hybrid local and charge transfer(HLCT)materials ensure that high-lying triplet state excitons quickly transfer to singlet state by reverse intersystem crossing(RISC),making that the exciton utilization rate reaches theoretical 100%.And the rapid RISC can effectively suppress triplet excitons quenching,further contribute to small efficiency roll-off.Herein,by charge balance strategy,we first prepared highly efficient blue OLEDs based on blue HLCT material of pCzAnN by optimizing device structure.On the basis of above,two-color and three-color white OLEDs were fabricated by incomplete energy transfer strategy based on pCzAnN as the sensitized host of tradi⁃tional fluorescent material.The resulting white OLEDs achieve the high color rendering index of 90 and maxi⁃mum external quantum efficiency of 8.76%,and such device also exhibits small efficiency roll-off and excellent spectra stability.This study provides a guidance for developing simple,highly efficient,small efficiency roll-off white OLEDs in the future.

关 键 词：有机发光二极管 白光 杂化局部和电荷转移 效率滚降 

分 类 号：O482.31[理学—固体物理] TN312.8[理学—物理]