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

journal article Nov 15, 2001

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

Chihaya Adachi

Marc A. Baldo Mark E. Thompson

Stephen R. Forrest

Journal of Applied Physics Vol. 90 No. 10 pp. 5048-5051 · AIP Publishing

View at Publisher Save 10.1063/1.1409582

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.

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References

Details

Published: Nov 15, 2001
Vol/Issue: 90(10)
Pages: 5048-5051

Authors

C

Chihaya Adachi

Center for Photonics and Optoelectronic Materials (POEM), Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544

M

Marc A. Baldo

Center for Photonics and Optoelectronic Materials (POEM), Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544

M

Mark E. Thompson

Center for Photonics and Optoelectronic Materials (POEM), Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544

S

Stephen R. Forrest

Center for Photonics and Optoelectronic Materials (POEM), Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544

Cite This Article

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

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

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