Blue phosphorescent organic light-emitting diodes using an exciplex forming co-host with the external quantum efficiency of theoretical limit

Adv Mater. 2014 Jul 16;26(27):4730-4. doi: 10.1002/adma.201400955. Epub 2014 May 19.

Abstract

A high-efficiency blue-emitting organic light-emitting diode (OLED) approaching theoretical efficiency using an exciplex-forming co-host composed of N,N'-dicarbazolyl-3,5-benzene (mCP) and bis-4,6-(3,5-di-3-pyridylphenyl)- 2-methylpyrimidine (B3PYMPM) is fabricated. Iridium(III)bis[(4,6-difluorophenyl)- pyridinato-N,C2']picolinate (FIrpic) is used as the emitter, which turns out to have a preferred horizontal dipole orientation in the emitting layer. The OLED shows a maximum external quantum efficiency of 29.5% (a maximum current efficiency of 62.2 cd A(-1) ), which is in perfect agreement with the theoretical prediction.

Keywords: FIrpic; blue phosphorescent OLED; exciplex forming co-host; map of maximum achievable EQE.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Color
  • Coordination Complexes / chemistry*
  • Light*
  • Luminescent Measurements
  • Quantum Theory
  • Semiconductors*

Substances

  • Coordination Complexes
  • bis((4,6-difluorophenyl)pyridinato-N,C(2'))iridium(III)picolinate