Nearly 100% internal phosphorescence efficiency in an organic light emitting device

Chihaya Adachi; Marc A. Baldo; Mark E. Thompson; Stephen R. Forrest

doi:10.1063/1.1409582

Nearly 100% internal phosphorescence efficiency in an organic light emitting device

Chihaya Adachi, Marc A. Baldo, Mark E. Thompson, Stephen R. Forrest

Research output: Contribution to journal › Article › peer-review

3320 Citations (Scopus)

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) Im/V 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.

Original language	English
Pages (from-to)	5048-5051
Number of pages	4
Journal	Journal of Applied Physics
Volume	90
Issue number	10
DOIs	https://doi.org/10.1063/1.1409582
Publication status	Published - Nov 15 2001
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1063/1.1409582

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title = "Nearly 100% internal phosphorescence efficiency in an organic light emitting device",

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) Im/V 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.",

author = "Chihaya Adachi and Baldo, {Marc A.} and Thompson, {Mark E.} and Forrest, {Stephen R.}",

year = "2001",

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T1 - Nearly 100% internal phosphorescence efficiency in an organic light emitting device

AU - Adachi, Chihaya

AU - Baldo, Marc A.

AU - Thompson, Mark E.

AU - Forrest, Stephen R.

PY - 2001/11/15

Y1 - 2001/11/15

N2 - 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) Im/V 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.

AB - 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) Im/V 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.

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Nearly 100% internal phosphorescence efficiency in an organic light emitting device

Abstract

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