Star-shaped thermally activated delayed fluorescence emitters with a tri-armed arylsulfonic acceptor for efficient solution processed organic light emitting diodes. Issue 16 (30th March 2020)

• Record Type: Journal Article
• Authors: Xiao, Ran; Xiang, Yepeng; Cao, Xiaosong; Li, Nengquan; Huang, Taian; Zhou, Changjiang; Zou, Yang; Xie, Guohua; Yang, Chuluo
• Is Part Of: Journal of materials chemistry. Volume 8:Issue 16(2020)
• Page Start: 5580
• Page End: 5586
• Publication Date: 2020-03-30
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/c9tc07049d
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Two star-shaped TADF emitters bearing an arylsulfone-derived acceptor were developed for wet-processed OLEDs, with efficient blue/green emission and low roll-off. Abstract : A tri-armed arylsulfone-based acceptor (SF) linked by triphenylbenzene (TPB) has been developed to construct solution-processable thermally activated delayed fluorescence (TADF) materials with large band gaps. The acceptor suffered limited conjugation due to the tetrahedral geometry of sulfonyl groups, as well as a meta-linkage at the central TPB moiety. By simple conjugation of the SF with appropriate donor units, luminophores SF–DMAC and SF–PXZ capable of producing efficient blue/green emissions were obtained, with peak efficiencies of 11.3% (19.0 cd A −1 and 10.0 lm W −1 ) and 12.4% (35.6 cd A −1 and 17.8 lm W −1 ) in the corresponding wet-processed OLEDs. Decent resistance to roll-off at high brightness was noticed in the device based on SF–PXZ, ascribing to reduced intermolecular interactions due to its star-shaped architecture and an efficient reverse intersystem crossing (RISC) process.