Gan Lin, Li Xianglong, Cai Xinyi, Liu Kunkun, Li Wei, Su Shi-Jian
State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Wushan Road 381, Tianhe District, Guangzhou 510640, Guangdong Province, P. R. China.
Beilstein J Org Chem. 2018 Mar 22;14:672-681. doi: 10.3762/bjoc.14.55. eCollection 2018.
The design of orange-light emitting, thermally activated, delayed fluorescence (TADF) materials is necessary and important for the development and application of organic light-emitting diodes (OLEDs). Herein, two donor-acceptor-donor (D-A-D)-type orange TADF materials based on fluorenone and acridine, namely 2,7-bis(9,9-dimethylacridin-10(9)-yl)-9-fluoren-9-one (27DACRFT, ) and 3,6-bis(9,9-dimethylacridin-10(9)-yl)-9-fluoren-9-one (36DACRFT, ), were successfully synthetized and characterized. The studies on their structure-property relationship show that the different configurations have a serious effect on the photoluminescence and electroluminescence performance according to the change in singlet-triplet splitting energy (Δ) and excited state geometry. This indicates that a better configuration design can reduce internal conversion and improve triplet exciton utilization of TADF materials. Importantly, OLEDs based on exhibited a maximum external quantum efficiency of 8.9%, which is higher than the theoretical efficiency of the OLEDs based on conventional fluorescent materials.
设计橙色发光的热激活延迟荧光（TADF）材料对于有机发光二极管（OLED）的发展和应用至关重要。在此，基于芴酮和吖啶成功合成并表征了两种供体-受体-供体（D-A-D）型橙色TADF材料，即2,7-双（9,9-二甲基吖啶-10(9)-基）-9-芴酮（27DACRFT）和3,6-双（9,9-二甲基吖啶-10(9)-基）-9-芴酮（36DACRFT）。对其结构-性能关系的研究表明，根据单重态-三重态分裂能（Δ）和激发态几何结构的变化，不同构型对光致发光和电致发光性能有严重影响。这表明更好的构型设计可以减少内转换并提高TADF材料的三重态激子利用率。重要的是，基于[此处原文缺失相关材料]的OLED表现出8.9%的最大外量子效率，高于基于传统荧光材料的OLED的理论效率。
