Efficient Orange-Red Thermally Activated Delayed Fluorescence Emitters Feasible for Both Thermal Evaporation and Solution Process

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

2 Scopus Citations
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Author(s)

  • Jia-Xiong Chen
  • Wen-Wen Tao
  • Kai Wang
  • Ming Zhang
  • Xiao-Chun Fan
  • Jia Yu
  • Shengliang Li
  • Feng-Xia Geng
  • Xiao-Hong Zhang

Detail(s)

Original languageEnglish
Pages (from-to)29086−29093
Journal / PublicationACS applied materials & interfaces
Volume11
Issue number12
Early online date22 Jul 2019
Publication statusPublished - 14 Aug 2019

Abstract

Development of red thermally activated delayed fluorescence (TADF) emitters has been lagging behind when compared with those of blue and green fluorophores, especially for solution-processable ones. In this work, two novel orange-red TADF emitters 3,6-di(10H-phenoxazin-10-yl)dibenzo[a,c]phenazine (DBPZ-DPXZ) and 10,10′-(11,12-bis(3,5-di-tert-butylphenyl)dibenzo[a,c]phenazine-3,6-diyl)bis(10H-phenoxazine) (tDBBPZ-DPXZ) are developed. A high-performance orange-red TADF emitter, DBPZ-DPXZ, is first prepared by connecting a rigid acceptor and two rigid donor segments. While this design strategy endows DBPZ-DPXZ with an excellent TADF performance leading to a vacuum-processed organic light-emitting diode (OLED) with a high external quantum efficiency (EQE) of 17.8%, the rigid segments limit its solubility and applications in solution-processed devices. Based on this prototype, tDBBPZ-DPXZ is designed with the addition of 3,5-di-tert-butylphenyl groups to boost its solubility with barely an influence on the photophysical properties. In particular, tDBBPZ-DPXZ maintains nearly an identical photoluminescence quantum yield of 83% and singlet-triplet energy splitting of 0.03 eV with EQE of 17.0% in a vacuum-processed orange-red OLED. Furthermore, it can be applied on the orange-red solution-processed OLED realizing an EQE as high as 10.1%, representing one of the state-of-the-art results of the reported orange-red solution-processed TADF-OLEDs. This work provides an effective strategy to address the conflicting requirements between high efficiency and good solubility and develop efficient soluble orange-red TADF emitters.

Research Area(s)

  • orange-red OLED, rigid segment, solution process, thermal evaporation, thermally activated delayed fluorescence

Citation Format(s)

Efficient Orange-Red Thermally Activated Delayed Fluorescence Emitters Feasible for Both Thermal Evaporation and Solution Process. / Chen, Jia-Xiong; Tao, Wen-Wen; Xiao, Ya-Fang; Wang, Kai; Zhang, Ming; Fan, Xiao-Chun; Chen, Wen-Cheng; Yu, Jia; Li, Shengliang; Geng, Feng-Xia; Zhang, Xiao-Hong; Lee, Chun-Sing.

In: ACS applied materials & interfaces, Vol. 11, No. 12, 14.08.2019, p. 29086−29093.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review