基于邻苯二甲酰亚胺受体热活化延迟荧光发射体的异构体效应  

Isomeric Effects in Thermally Activated Delayed Fluorescence Emitters with Phthalimide Acceptors

作　　者：冯全友[1] 操越 韩秋虎 常永正[1] 虞梦娜 谭克升 徐曼[1] 解令海[1] FENG Quanyou;CAO Yue;HAN Qiuhu;CHANG Yongzheng;YU Mengna;TAN Kesheng;XU Man;XIE Linghai(State Key Laboratory of Organic Electronics and Information Displays,Institute of Advanced Materials(IAM),School of Chemistry and Life Sciences,Nanjing University of Posts&Telecommunications,Nanjing 210023,China)

机构地区：[1]南京邮电大学化学与生命科学学院,有机电子与信息显示国家重点实验室,信息材料与纳米技术研究院,江苏南京210023

出　　处：《发光学报》2024年第12期1913-1921,共9页Chinese Journal of Luminescence

基　　金：国家自然科学基金(22375100)。

摘　　要：设计合成了3-CzAIAd和3-DPFCzAIAd两种新型热活化延迟荧光(TADF)发射体,并与其异构体4-CzAIAd和4-DPFCzAIAd进行了对比研究。咔唑单元的取代位置显著影响着发射体的光物理性质和发光器件性能。同4号位取代的化合物相比,在3号位取代的相应的发射体表现出较高的三线态能级、较小的Δ_(EST)和荧光量子效率以及相对红移的发光光谱。基于3-DPFCzAIAd的器件展现出20.8%的最大外量子效率、57.1 cd·A^(-1)的最大电流效率和长达260 h的半寿命@500 cd·m^(-2),而4-DPFCzAIAd对应的发光器件虽然表现出28.2%的最大外量子效率,但半寿命@500 cd·m^(-2)缩短为178 h,效率滚降更大,达到77%。We designed and synthesized two novel thermally activated delayed fluorescence emitters,3-CzAIAd and 3-DPFCzAIAd,and performed a comparative analysis with their isomeric counterparts,4-CzAIAd and 4-DPFCzAIAd.The substitution position of the carbazole unit plays a critical role in modulating the photophysical properties of the emitters and the device performance of organic light-emitting diodes.Emitters with carbazole units substituted at the 3-position of phthalimide group exhibited higher triplet energy levels,smaller singlet-triplet energy gaps,lower photoluminescence quantum yields,and more red-shifted emission spectra.Devices incorporating 3-DPFCzAIAd achieved a maximum external quantum efficiency of 20.8%,a peak current efficiency of 57.1 cd·A^(-1),and an opera-tional half-lifetime of 260 h under an initial luminescence of 500 cd·m^(-2).Conversely,while devices based on 4-DPF-CzAIAd exhibited a higher peak EQE of 28.2%,they experienced a shorter operational lifetime of 178 h under an ini-tial luminescence of 500 cd·m^(-2)and more pronounced efficiency roll-off of up to 77%.

关 键 词：热活化延迟荧光 发射体 邻苯二甲酰亚胺 异构体 

分 类 号：O482.31[理学—固体物理]