基于蒽核的高性能深蓝光“热激子”材料  

High-performance Deep Blue“Hot Exciton”Materials Based on Anthracene

作　　者：许雷 俞越[1,2] 潘玉钰 王博涵[1] 应磊 马於光[1] XU Lei;YU Yue;PAN Yuyu;WANG Bohan;YING Lei;MA Yuguang(State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou 510640,China;Dongguan Volt-Amp Optoelectronics Technology Co.,Ltd.,Guangzhou 510006,China;School of Petrochemical Engineering,Shenyang University of Technology,Liaoyang 111003,China)

机构地区：[1]华南理工大学发光材料与器件国家重点实验室,广东广州510640 [2]东莞伏安光电科技有限公司,广东广州510006 [3]沈阳工业大学石油化工学院,辽宁辽阳111003

出　　处：《发光学报》2023年第7期1300-1307,共8页Chinese Journal of Luminescence

基　　金：国家重点研发计划(2020YFA0714604);国家自然科学基金(U20A6002,91833304,51521002);广东省基础与应用基础研究重点项目(2019B030302007);广州市科技计划研究与发展基金(202007020004);广东省自然科学基金(2019B121205002);广东省分子聚集体发光重点实验室(2019B030301003)。

摘　　要：蓝光OLED材料是电致发光领域的关键和难点。基于高能激发态转换的“热激子”材料表现出优异蓝光材料的潜能。本文通过调节给受体的推拉电子能力,以蒽为核心构筑单元、三苯基苯为弱给体、苯氰基为受体,设计合成了一种新型D-π-A结构分子TACN。扭曲的三苯基苯提供了高度扭曲的分子构象,有效减弱了聚集态下的猝灭效应,因此TACN表现出高的荧光量子产率(聚集态下47%)。实验结果和理论分析表明,TACN具备“热激子”特征,其大的T_(2)-T_(1)能隙(1.45 eV)有效阻碍了从T_(2)到T_(1)的内转换(IC)过程,而小的T_(2)-S_(1)能差(0.18 eV,T_(2)>S_(1))有利于促进反向系间窜越(RISC)过程。基于TACN的非掺杂器件表现出深蓝色发射(λmax=444 nm),半峰宽(FWHM)为59 nm,色坐标为(0.17,0.13)。其最大外量子效率(EQEmax)为8.3%,相应的激子利用率(EUE)最高为88.7%。The blue OLED material plays a vital role in the field of electroluminescence.Based on high-energy ex⁃cited state transition,the“hot exciton”materials show the potential of excellent blue light emitting.We designed and synthesized a novel D-π-A structure molecule TACN using anthracene as the core building unit,triphenylben⁃zene as the weak donor and phenylcyanogen as the acceptor by adjusting the ability of pushing and pulling electrons.Distorted triphenylbenzene provides a highly distorted molecular conformation,which effectively attenuates the quenching effect in the aggregated state.Therefore,TACN exhibits a high fluorescence quantum yield(47%in the aggregated state).The experimental results and theoretical analysis show that TACN has the“hot exciton”character⁃istic,and its large T_(2)-T_(1) gap(1.45 eV)effectively hinders the internal conversion(IC)process from T_(2) to T_(1),while its small T_(2)-S_(1) energy difference(0.18 eV,T_(2)>S_(1))facilitates the reverse intersystem crossing(RISC)process.Nondoped devices based on TACN exhibit dark blue emission(λmax=444 nm),full width at half maximum(FWHM)of 59 nm,and color coordinates of(0.17,0.13).Its maximum external quantum efficiency(EQEmax)is 8.3%and corresponding exciton utilization(EUE)is up to 88.7%.

关 键 词：有机发光二极管 热激子 蓝光材料 蒽 反向系间窜越 

分 类 号：O482.31[理学—固体物理]