Abstract

We demonstrate very high efficiency electrophosphorescence in organic light-emitting devices employing a phosphorescent molecule doped into a wide energy gap host. Using bis(2-phenylpyridine)iridium(III) acetylacetonate [(ppy)2Ir(acac)] doped into 3-phenyl-4(1′-naphthyl)-5-phenyl-1,2,4-triazole, a maximum external quantum efficiency of (19.0±1.0)% and luminous power efficiency of (60±5) lm/W are achieved. The calculated internal quantum efficiency of (87±7)% is supported by the observed absence of thermally activated nonradiative loss in the photoluminescent efficiency of (ppy)2Ir(acac). Thus, very high external quantum efficiencies are due to the nearly 100% internal phosphorescence efficiency of (ppy)2Ir(acac) coupled with balanced hole and electron injection, and triplet exciton confinement within the light-emitting layer.

Keywords

PhosphorescenceQuantum efficiencyPhosphorescent organic light-emitting diodeIridiumMaterials sciencePhotoluminescenceOptoelectronicsLuminous efficacyDopingPhotochemistryExcitonElectrical efficiencyChemistryLayer (electronics)OpticsFluorescencePower (physics)PhysicsNanotechnologyCondensed matter physicsCatalysisOrganic chemistry

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Year
2001
Type
article
Volume
90
Issue
10
Pages
5048-5051
Citations
3398
Access
Closed

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Cite This

Chihaya Adachi, Marc A. Baldo, Mark E. Thompson et al. (2001). Nearly 100% internal phosphorescence efficiency in an organic light-emitting device. Journal of Applied Physics , 90 (10) , 5048-5051. https://doi.org/10.1063/1.1409582

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DOI
10.1063/1.1409582

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