Efficient non-doped yellow OLEDs based on thermally activated delayed fluorescence conjugated polymers with an acridine/carbazole donor backbone and triphenyltriazine acceptor pendant. Issue 3 (3rd January 2018)

• Record Type: Journal Article
• Authors: Wang, Yanjie; Zhu, Yunhui; Lin, Xingdong; Yang, Yike; Zhang, Baohua; Zhan, Hongmei; Xie, Zhiyuan; Cheng, Yanxiang
• Is Part Of: Journal of materials chemistry. Volume 6:Issue 3(2017)
• Page Start: 568
• Page End: 574
• Publication Date: 2018-01-03
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c7tc04994c
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Non-doped OLEDs employing TADF conjugated polymers exhibit excellent electroluminescent performances. Abstract : Polymers with thermally activated delayed fluorescence (TADF) are very suitable and promising emitters for use in solution-processed organic light-emitting diodes (OLEDs). However, only a few efficient TADF polymers have been reported to date. In this work, a series of polymers with acridine/carbazole donor backbones and triphenyltriazine acceptor pendant are synthesized. The polymers show remarkable TADF due to the intrinsic twisted donor/acceptor structure derived from the copolymerization monomer and have a high photoluminescence quantum yield of up to 90%, in neat films, through management of the monomer ratios. Non-doped OLEDs based on the polymers display a yellow emission and achieve maximum external quantum and power efficiencies of up to 15.5% and 50.5 lm W −1 . More importantly, the non-doped devices possess low turn-on and driving voltages of 2.53 V and 4.05 V (1000 cd m −2 ) with an extremely small efficiency roll-off of as low as 0.5%. Compared with doped devices, non-doped devices exhibit superior electroluminescent performances, with similar efficiencies but a lower efficiency roll-off and driving voltage, verifying that the designed conjugated polymers are superior emitters for non-doped TADF OLEDs by simple solution-processing.