Two novel bipolar compounds based-on 1, 2, 4-triazol derivatives for non-doped deep-blue and green phosphorescent OLED applications

Kexiang Wang, Peng Sun, Huixia Xu*, Jie Li, Fang Wang, Yanqin Miao, Tingting Yang, Hua Wang, Bingshe Xu, Wai Yeung WONG

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)

Abstract

Utilizing 2-(2-phenyl-2H-1,2,4-triazol-3-yl)pyridine (TAZ) as acceptor, two novel bipolar materials were designed and synthesized, one using triphenylamine (TPA) as donor and named as TAZ-TPA, and the second one using 9,9-diphenyl-9H-fluorene (DPPF) as donor and denoted as TAZ-DPPF. The different donors result in the various photophysical natures. The compound of TAZ-TPA possesses high thermal stabilities with a glass transition temperature (Tg) of 145 °C and shows a strong deep-blue emission at 435 nm in CH2Cl2 solution. The non-doped device utilizing TAZ-TPA as emitter exhibits excellent stability with the Commission Internation de L'Eclairage coordinates of (0.15, 0.05). The radiative exciton yield of 36% in TAZ-TPA device is obtained due to the occurrence of charge transfer and hybridized local and charge-transfer excited states. The PL spectrum of TAZ-DPPF locates in the ultraviolet range with the peaks at 384 and 377 nm, and only the local electron excited state is observed. The green phosphorescent OLED hosted by TAZ-DPPF has achieved the performance of the current efficiency at 45.0 cd/A.

Original languageEnglish
Pages (from-to)25-32
Number of pages8
JournalDyes and Pigments
Volume143
DOIs
Publication statusPublished - 1 Aug 2017

Scopus Subject Areas

  • Chemical Engineering(all)
  • Process Chemistry and Technology

User-Defined Keywords

  • 1, 2, 4-Triazol derivatives
  • Bipolar materials
  • Non-doped deep-blue OLEDs

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