Highly efficient blue–green neutral dinuclear copper(I) halide complexes containing bidentate phosphine ligands

Xiao Hong, Bo Wang, Li Liu, Xin Xin Zhong, Fa Bao Li, Lei Wang, Wai Yeung Wong, Hai Mei Qin, Yih Hsing Lo

Research output: Journal article publicationJournal articleAcademic researchpeer-review

27 Citations (Scopus)

Abstract

Recently, copper(I) complexes having thermally activated delayed fluorescence (TADF) have attracted much attention. Here, a series of new neutral luminescent dinuclear copper(I) halide complexes with the chelating ligand, 1,2-bis(diphenylphosphino)-4,5-dimethylbenzene (dpmb) were synthesized, and their molecular structures and photophysical properties were investigated. They consist of halogen-bridged dinuclear structures, [Cu(μ-X)dpmb]2(X=I (1), Br (2), Cl (3)). In the solid state, these complexes display intense blue–green photoluminescence with lifetimes in the microsecond regime (λmax=498–527 nm; Φ=0.28–0.32; τ=2.5–12.5 μs) at 298 K. The emission of the complexes originate from the (σ+X)→π*transition, where σ is the σ bond between Cu and P and X is the halogen. The organic light-emitting devices (OLEDs) using complexes 1–3 as the dopant emitters exhibit bright green luminescence with current efficiencies of 32.9 cd A−1and maximum external quantum efficiencies of 10.1%.
Original languageEnglish
Pages (from-to)64-72
Number of pages9
JournalJournal of Luminescence
Volume180
DOIs
Publication statusPublished - 1 Dec 2016
Externally publishedYes

Keywords

  • Bidentate phosphine
  • Cu(I) complexes
  • Dinuclear
  • Halide
  • Luminescence
  • OLED

ASJC Scopus subject areas

  • Biophysics
  • Atomic and Molecular Physics, and Optics
  • Chemistry(all)
  • Biochemistry
  • Condensed Matter Physics

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