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High-purity white light from a simple single dopant host-guest white organic light-emitting diode architecture

Appl. Phys. Lett. 93, 163302 (2008); doi:10.1063/1.3005424

Published 20 October 2008

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Pavel Anzenbacher, Jr., Victor A. Montes, and Shin-ya Takizawa
Center for Photochemical Sciences, Bowling Green State University, Bowling Green, Ohio 43403, USA
White light with good color properties (color rendering index=82–87) is generated in a simple organic light-emitting diode comprising an emissive layer, composed of an undoped tris(4-methyl-8-quinolinato)aluminum (Almq3) sublayer and region doped with an orange-red phosphorescent dopant, bis(2-phenyl-1-quinoline)iridium acetylacetonate (Ir(pq)2acac). Electron-hole recombination in a thin spacing Almq3 layer results in blue-green fluorescence, while the formed triplet excitons diffuse to the doped region and are harvested by the dopant to emit orange-red phosphorescence. The combination of blue-green and orange lights results in warm white light. This approach takes advantage of efficient migration of triplet excitons while being less demanding in terms of fabrication and color matching. ©2008 American Institute of Physics
History: Received 30 July 2008; accepted 1 October 2008; published 20 October 2008
Permalink: http://link.aip.org/link/?APPLAB/93/163302/1
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KEYWORDS and PACS

Keywords
PACS
  • 85.60.Jb
    Light-emitting devices
  • 72.20.Jv
    Charge carriers: generation, recombination, lifetime, and trapping (semiconductors/insulators)
  • YEAR: 2008

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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AIP is a member of CrossRef AIP

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