Triplet exciton confinement in green organic light-emitting diodes containing luminescent charge-transfer Cu(I) complexes

Qisheng Zhang, Takeshi Komino, Shuping Huang, Shigeyuki Matsunami, Kenichi Goushi, Chihaya Adachi

研究成果: ジャーナルへの寄稿学術誌査読

293 被引用数 (Scopus)

抄録

The temperature dependence of luminescence from [Cu(dnbp)(DPEPhos)]BF 4 (dnbp = 2,9-di-n-butylphenanthroline, DPEPhos = bis[2-(diphenylphosphino)phenyl]ether) in a poly(methyl methacrylate) (PMMA) film indicates the presence of long-life green emission arising from two thermally equilibrated charge transfer (CT) excited states and one non-equilibrated triplet ligand center ( 3LC) excited state. At room temperature, the lower triplet CT state is found to be the predominantly populated excited state, and the zero-zero energy of this state is found to be 2.72 eV from the onset of its emission at 80 K. The tunable emission maximum of [Cu(dnbp)(DPEPhos)]BF 4 in various hosts with different triplet energies is explained in terms of the multiple triplet energy levels of this complex in amorphous films. Using the high triplet energy charge transport material as a host and an exciton-blocking layer (EBL), a [Cu(dnbp)(DPEPhos)] BF 4 based organic light-emitting diode (OLED) achieves a high external quantum efficiency (EQE) of 15.0%, which is comparable to values for similar devices based on Ir(ppy) 3 and FIrpic. The photoluminescence (PL) and electroluminescence (EL) performance of green emissive [Cu(μI)dppb] 2 (dppb = 1,2-bis[diphenylphosphino]benzene) in organic semiconductor films confirmed its 3CT state with a zero-zero energy of 2.76 eV as the predominant population excited state.

本文言語英語
ページ(範囲)2327-2336
ページ数10
ジャーナルAdvanced Functional Materials
22
11
DOI
出版ステータス出版済み - 6月 6 2012

!!!All Science Journal Classification (ASJC) codes

  • 化学一般
  • 材料科学一般
  • 凝縮系物理学

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