Teaching an old acceptor new tricks: rationally employing 2, 1, 3-benzothiadiazole as input to design a highly efficient red thermally activated delayed fluorescence emitter. Issue 6 (23rd January 2017)

• Record Type: Journal Article
• Authors: Ni, Fan; Wu, Zhongbin; Zhu, Zece; Chen, Tianheng; Wu, Kailong; Zhong, Cheng; An, Kebin; Wei, Danqing; Ma, Dongge; Yang, Chuluo
• Is Part Of: Journal of materials chemistry. Volume 5:Issue 6(2017)
• Page Start: 1363
• Page End: 1368
• Publication Date: 2017-01-23
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7tc00025a
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Benzothiadiazole-based D–A–D structured red TADF emitter results in high-performance OLEDs with a maximum EQE of 8.8% and CIE (0.61, 0.39). Abstract : The exploitation of blue to orange emissive thermally activated delayed fluorescence (TADF) materials has been conducted comprehensively, while the equally important red TADF materials have been studied at a relatively slow pace. Three D–A–D structured fluorescent molecules, N 4, N 4, N 7, N 7 -tetraphenylbenzo[ c ][1, 2, 5]thiadiazole-4, 7-diamine (BTZ–DPA), 4, 7-bis(9 H -carbazol-9-yl)benzo[ c ][1, 2, 5]thiadiazole (BTZ–CZ) and 4, 7-bis(9, 9-dimethylacridin-10(9 H )-yl) benzo[ c ][1, 2, 5]thiadiazole (BTZ–DMAC) were designed and synthesized by rationally employing 2, 1, 3-benzothiadiazole as an acceptor. The introduction of 2, 1, 3-benzothiadiazole not only presents an efficient input for the design of red TADF emitters, but also provides benefits for the resulting high-efficiency organic light-emitting diodes (OLEDs) which show a maximum external quantum efficiency of 8.8% at a luminance of 1.06 cd m −2 with the emission peak at 636 nm.