Yang Yun, Yang Liuqing, Li Xuefei, Zhao Lei, Wang Shumeng, Ding Junqiao, Wang Lixiang
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, China.
School of Applied Chemistry and Engineering, University of Science and Technology of China, Hefei, China.
Front Chem. 2020 Apr 21;8:287. doi: 10.3389/fchem.2020.00287. eCollection 2020.
Single white-emitting polymers have been reported by incorporating the second-generation carbazole dendron into the side chain of a red-emitting thermally activated delayed fluorescence (TADF) polymer. Due to the prevented hole trap effect, in this case, excitons can be generated simultaneously on the polymeric host and the red TADF dopant to give a dual emission. Consequently, a bright white electroluminescence is achieved even at a dopant loading as high as 5 mol.%, revealing a maximum luminous efficiency of 16.1 cd/A (12.0 lm/W, 8.2%) and Commission Internationale de l'Eclairage (CIE) coordinates of (0.42, 0.32). The results clearly indicate that the delicate tuning of charge trap is a promising strategy to develop efficient single white-emitting polymers, whose low-band-gap chromophore content can be up to a centesimal level.
通过将第二代咔唑树枝状分子引入到发红光的热激活延迟荧光（TADF）聚合物的侧链中，已报道了单一白色发光聚合物。在这种情况下，由于空穴陷阱效应得到抑制，激子可以在聚合物主体和红色TADF掺杂剂上同时产生，从而产生双重发射。因此，即使在掺杂剂负载高达5 mol.%的情况下也能实现明亮的白色电致发光，其最大发光效率为16.1 cd/A（12.0 lm/W，8.2%），国际照明委员会（CIE）坐标为（0.42，0.32）。结果清楚地表明，对电荷陷阱进行精细调节是开发高效单一白色发光聚合物的一种有前景的策略，其低带隙发色团含量可达百分之一水平。
