基于热活化延迟荧光小分子直接聚合的单一白光高分子的合成与表征  

Synthesis and Characterization of Single White-emitting Polymers Based on Polymerized Thermally Activated Delayed Fluorescence Small Molecules

作　　者：刘燊 李雪[1,2] 赵磊[1] 王淑萌[1] 田洪坤 丁军桥[1,2,3] 王利祥 Shen Liu;Xue Li;Lei Zhao;Shu-meng Wang;Hong-kun Tian;Jun-qiao Ding;Li-xiang Wang(State Key Laboratory of Polymer Physics and Chemistry,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022;School of Applied Chemistry and Engineering,University of Science and Technology of China,Hefei 230026;School of Chemical Science and Technology,Yunnan University,Kunming 650091)

机构地区：[1]中国科学院长春应用化学研究所高分子物理与化学国家重点实验室,长春130022 [2]中国科学技术大学应用化学与工程学院,合肥230026 [3]云南大学化学科学与工程学院,昆明650091

出　　处：《高分子学报》2024年第10期1300-1312,共13页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号52273198和51873205);云南省基础研究计划项目(项目号202301BF070001-008);云南省“兴滇英才支持计划”云岭学者专项资助.

摘　　要：基于热活化延迟荧光(TADF)小分子直接聚合的分子设计原则,采用吖啶-二苯甲酮-咔唑(AcBPCz)、吖啶-萘二甲酰亚胺-咔唑(AcNICz)和四甲基苯分别作为天蓝光TADF单元、橙光TADF单元和连接单元,设计合成了系列单一白光高分子P010~P075.通过调控不同发色团之间的能量转移,所有单一白光高分子均表现出来自AcBPCz的天蓝光发射和来自AcNICz的橙光发射.相应OLED器件获得了有效的白光发射,最大电流效率和外量子效率分别为5.4~16.8cd·A^(-1)和3.0%~6.4%.同时,光色可以从P010的冷白光转变到P075的暖白光,色坐标CIE从(0.32,0.50)移动到(0.47,0.44),色温CCT从5910K降低到2797K.Based on polymerized thermally activated delayed fluorescence(TADF)small molecules,a series of single white-emitting polymers named P010-P075 have been designed and synthesized by using acridinebenzophenone-carbazole(AcBPCz)as the sky-blue TADF moiety,acridine-naphthalimide-carbazole(AcNICz)as the orange TADF moiety and tetramethylbenzene as the linker between them.After a modulation of the AcNICz content in the range of 1%-7.5%,a part energy transfer can happen from AcBPCz to AcNICz.Consequently,P010-P075 all display a dual spectral profile in the photoluminescence(PL):the sky-blue emission peaked at 482-492 nm is from AcBPCz,while the orange emission peaked at 590-602 nm is from AcNICz.And the ratio of sky-blue to orange emission together is found to be decreased gradually with the increasing content of AcNICz.The corresponding solution-processed OLEDs achieve a bright white electroluminescence(EL),revealing a maximum current efficiency of 5.4-16.8 cd·A^(-1) and a maximum external quantum efficiency of 3.0%-6.4%.Noticeably,the EL is obviously dependent on the AcNICz content,consistent with the PL counterparts.Ongoing from P010 to P075,the Commission Internationale d’Eclairage(CIE)coordinates are shifted from(0.32,0.50)to(0.47,0.44)and the correlated color temperature(CCT)is reduced from 5910 K to 2797 K.The obtained cold white EL for P010 and warm white EL for P075 are believed to be applicable for different lighting scenes.

关 键 词：有机发光二极管 热活化延迟荧光(TADF)高分子 单一白光高分子 TADF小分子直接聚合 光色 

分 类 号：TN383.1[电子电信—物理电子学] O631.5[理学—高分子化学]