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Adv Mater. 2012 Jun 5;24(21):2922-8. doi: 10.1002/adma.201200927. Epub 2012 May 3.

N-heterocyclic carbazole-based hosts for simplified single-layer phosphorescent OLEDs with high efficiencies.

Author information

1
Department of Chemistry, Queen's University, Kingston, Ontario, Canada.

Abstract

Highly efficient single-layer organic light-emitting diodes (OLEDs) are demonstrated using new N-heterocyclic carbazole-based host materials. Phosphorescent OLEDs with a structure of ITO/MoO(3) /host/host:dopant/host/Cs(2) CO(3) /Al are fabricated in which the new materials act simultaneously as electron-transport, hole-transport, and host layer. Devices with maximum current and external quantum efficiencies of 92.2 cd A(-1) and 26.8% are achieved, the highest reported to date for a single-layer OLED.

PMID:
22553162
DOI:
10.1002/adma.201200927
[Indexed for MEDLINE]

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