Phosphorescent PtAu2 Complexes with Differently Positioned Carbazole-Acetylide Ligands for Solution-Processed Organic Light-Emitting Diodes with External Quantum Efficiencies of over 20%

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

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Author(s)

  • Liang-Jin Xu
  • Xian-Chong Zeng
  • Jin-Yun Wang
  • Li-Yi Zhang
  • Zhong-Ning Chen

Detail(s)

Original languageEnglish
Pages (from-to)20251-20257
Journal / PublicationACS Applied Materials and Interfaces
Volume8
Issue number31
Online published19 Jul 2016
Publication statusPublished - 10 Aug 2016
Externally publishedYes

Abstract

The utilization of phosphorescent metal cluster complexes as new types of emitting materials in organic light-emitting diodes (OLEDs) is becoming an alternative and viable approach for achieving high-efficiency electroluminescence. We report herein the design of cationic PtAu2 cluster complexes with differently positioned 9-phenylcarbazole-acetylides to serve as phosphorescent emitters in OLEDs. The rigid structures of PtAu2 complexes cause intense phosphorescence with quantum yields of over 85%, which originates from 3[π(phenylcarbazole-acetylide) → π∗(dpmp)] ligand-to-ligand and 3[π(phenylcarbazole-acetylide) → p/s(PtAu2)] ligand-to-metal charge-transfer triplet excited states. When 8 wt % PtAu2 is doped to blended host materials of TCTA and OXD-7 (2:1 weight ratio) as light-emitting layers, solution-processed OLEDs give a current efficiency of 78.2 cd A-1 and an external quantum efficiency (EQE) of 21.5% at a practical luminance of 1029 cd m-2 with a slow efficiency roll-off upon increasing luminance. This represents the best device performance and the highest efficiency recorded at practical luminance for solution-processed OLEDs.

Research Area(s)

  • electroluminescence, gold, organic light-emitting diode, phosphorescence, platinum, solution process

Citation Format(s)

Phosphorescent PtAu2 Complexes with Differently Positioned Carbazole-Acetylide Ligands for Solution-Processed Organic Light-Emitting Diodes with External Quantum Efficiencies of over 20%. / Xu, Liang-Jin; Zeng, Xian-Chong; Wang, Jin-Yun; Zhang, Li-Yi; Chi, Yun; Chen, Zhong-Ning.

In: ACS Applied Materials and Interfaces, Vol. 8, No. 31, 10.08.2016, p. 20251-20257.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal