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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 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−1 and 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

Scopus Subject Areas

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

User-Defined Keywords

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

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