Diphenylphosphine oxide-based host materials for green phosphorescent organic light-emitting devices

Tingting Yang, Huixia Xu, Zhaoyang Xi, Kexiang Wang, Peng Tao, Peng Sun, Bo Zhao, Yanqin Miao, Hong Lian, Hua Wang, Bingshe Xu*, Wai Yeung WONG

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Two novel host materials based on the diphenylphosphine oxide (DPPO) and spirofluorene were designed and facilely synthesized by tuning the ratio of donor spirofluorene units and acceptor DPPO units from 1: 1 to 1: 2, i. e., (4-(9,9′-spirobi[fluoren]-2-yl)phenyl)diphenylphosphine oxide (SPDPPO) and (9,9′-spirobi[fluorene]-2,7-diylbis(4,1-phenylene))bis(diphenylphosphine oxide) (SBPBDPPO). Furthermore, 3,6-disubstituted spirofluorene possesses better thermal stability performance, for instance, higher glass transition temperatures (SPDPPO of 140 °C and SBPBDPPO of 172 °C). The phosphorescent organic light-emitting devices (PhOLEDs) were fabricated by doping tris(2-phenylpyridine)iridium (Ir(ppy)3) in hosts as light-emitting layer. The PhOLEDs employed SPDPPO as host exhibited a low turn-on voltage of 3.0 V and the maximum current efficiency of 36.5 cd/A, power efficiency of 32.8 lm/W and a maximum external quantum efficiency (EQE) of 10.5%, respectively.

Original languageEnglish
Pages (from-to)582-588
Number of pages7
JournalDyes and Pigments
Volume146
DOIs
Publication statusPublished - Nov 2017

Scopus Subject Areas

  • Chemical Engineering(all)
  • Process Chemistry and Technology

User-Defined Keywords

  • Diphenylphosphine oxide
  • Host material
  • PhOLED
  • Phosphorescence

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