Highly efficient, single-layer organic light-emitting devices based on a graded-composition emissive layer

Nicholas C. Erickson, Russell J. Holmes

Research output: Contribution to journalArticle

62 Scopus citations

Abstract

We demonstrate highly efficient electrophosphorescence from devices comprising a single organic layer. High efficiency is realized by combining both hole- and electron-transporting host materials (HTMs and ETMs, respectively) into a single, graded-composition emissive layer with the green phosphorescent emitter fac-tris(2-phenylpyridine) iridium (III). The composition is continuously graded to realize nearly 100% HTM at the anode and nearly 100% ETM at the cathode. Peak external quantum and power efficiencies of ηEQE = (19.3±0.4) % and ηP = (66.5±1.3) lm/W are realized at a luminance level of 600 cd/ m2.

Original languageEnglish (US)
Article number083308
JournalApplied Physics Letters
Volume97
Issue number8
DOIs
StatePublished - Aug 23 2010

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