Homoleptic thiazole-based IrIII phosphorescent complexes for achieving both high EL efficiencies and an optimized trade-off among the key parameters of solution-processed WOLEDs

Haoran Guo, Jiang Zhao, Zhuanzhuan Tian, Yong Wu, Boao Liu, Feifan Dang, Xiaolong Yang, Guijiang Zhou*, Zhaoxin Wu, Wai Yeung WONG

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Two homoleptic thiazole-based IrIII phosphorescent emitters, Ir-3Tz1F and Ir-3Tz2F, with fluorinated 2-phenylthiazole-type ligands were designed and prepared. Their thermal stability, and photophysical and electrochemical properties, as well as electroluminescent (EL) performances in both monochromic OLEDs and solution-processed WOLEDs were investigated. When doped in monochromic OLEDs made by vacuum deposition, Ir-3Tz1F gave the maximum EL efficiencies with ηL of 56.2 cd A-1, ηext of 15.8% and ηp of 50.2 lm W-1. Critically, solution-processed WOLEDs based on Ir-3Tz1F with three primary colors could achieve an excellent trade-off among the stable balanced white EL spectra, a high EL efficiency and a high color rendering index (CRI). The optimized solution-processed WOLED exhibited very attractive EL efficiencies of 33.4 cd A-1, 16.5% and 30.6 lm W-1, while maintaining both a high CRI of ca. 80 and very stable Commission Internationale de L'Eclairage (CIE) coordinates in a wide driving voltage range from 4 V to 11 V.

Original languageEnglish
Pages (from-to)208-219
Number of pages12
JournalJournal of Materials Chemistry C
Volume5
Issue number1
DOIs
Publication statusPublished - 2017

Scopus Subject Areas

  • Chemistry(all)
  • Materials Chemistry

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