Nearly 100% internal phosphorescence efficiency in an organic light-emitting device
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- Chihaya Adachi
- Center for Photonics and Optoelectronic Materials (POEM), Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544
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- Marc A. Baldo
- Center for Photonics and Optoelectronic Materials (POEM), Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544
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- Mark E. Thompson
- Center for Photonics and Optoelectronic Materials (POEM), Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544
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- Stephen R. Forrest
- Center for Photonics and Optoelectronic Materials (POEM), Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544
書誌事項
- 公開日
- 2001-11-15
- DOI
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- 10.1063/1.1409582
- 公開者
- AIP Publishing
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説明
<jats:p>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.</jats:p>
収録刊行物
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- Journal of Applied Physics
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Journal of Applied Physics 90 (10), 5048-5051, 2001-11-15
AIP Publishing
