Realization of highly efficient white polymer light-emitting devices via interfacial energy transfer from poly(N-vinylcarbazole)

Aiyuan Li, Yuanyuan Li, Wanzhu Cai, Guijiang Zhou, Zhao Chen, Hongbin Wu, Wai Yeung Wong, Wei Yang, Junbiao Peng, Yong Cao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

31 Citations (Scopus)

Abstract

We report highly efficient white polymer light-emitting devices (WPLEDs) using a newly synthesized, deep-blue emitting fluorene-co-dibenzothiophene-S,S-dioxide copolymer as host, doped with two narrow-bandgap iridium complexes. Despite the low-lying triplet energy levels of the host, phosphorescent quenching by the polyfluorene copolymer host was significantly suppressed with poly(N-vinylcarbazole) (PVK) as hole-injecting, anode buffer layer. The energy transfer process had been studied via transient photoluminescence spectra and confirmed that PVK layer is responsible for the efficient electrophosphorescence in the devices. As a result of balanced red-green-blue (RGB) emission from the host and the triplet emitters, white emission with Commission Internationale de L'Eclairage (CIE) coordinates of (0.278, 0.312) was achieved, with a peak luminous efficiency of 15.1 cd A-1and a color rendering index (CRI) of 79-86.
Original languageEnglish
Pages (from-to)529-534
Number of pages6
JournalOrganic Electronics: physics, materials, applications
Volume11
Issue number4
DOIs
Publication statusPublished - 1 Apr 2010
Externally publishedYes

Keywords

  • Phosphorescence quenching
  • Poly(N-vinylcarbazole)
  • White polymer light-emitting devices

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry
  • Electrical and Electronic Engineering

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