Architectures for efficient electrophosphorescent organic light-emitting devices

Chihaya Adachi; Mark E. Thompson; Stephen R. Forrest

doi:10.1109/2944.999192

Architectures for efficient electrophosphorescent organic light-emitting devices

Chihaya Adachi, Mark E. Thompson, Stephen R. Forrest

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

59 Citations (Scopus)

Abstract

We discuss several device architectures leading to high-efficiency organic electrophosphorescent (EP) light emission. An external electroluminescence efficiency (η_ext) of (10.0 ± 0.5)% was realized by doping fac-tris(2-phenylpyridine)iridium (Ir(ppy)₃) into a 2,9-dimethyl-4,7-diphenyl-1,10-phenenthroline (BCP) electron transport layer. Direct exciton formation on the phosphor dopant avoids exciplex formation at the interface of unipolar hole and electron transport layers. Further, triplet exciton and carrier dynamics in a double heterostructure were investigated to determine the location and width of the exciton formation zone. High-efficiency EP is also demonstrated in a simplified two layer architecture using a 4,4′-N,N′-dicarbazole-biphenyl (CBP) ambipolar carrier transport host.

Original language	English
Pages (from-to)	372-377
Number of pages	6
Journal	IEEE Journal on Selected Topics in Quantum Electronics
Volume	8
Issue number	2
DOIs	https://doi.org/10.1109/2944.999192
Publication status	Published - Mar 2002
Externally published	Yes

All Science Journal Classification (ASJC) codes

Ceramics and Composites
Atomic and Molecular Physics, and Optics
Materials Chemistry
Electrical and Electronic Engineering

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10.1109/2944.999192

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title = "Architectures for efficient electrophosphorescent organic light-emitting devices",

abstract = "We discuss several device architectures leading to high-efficiency organic electrophosphorescent (EP) light emission. An external electroluminescence efficiency (ηext) of (10.0 ± 0.5)% was realized by doping fac-tris(2-phenylpyridine)iridium (Ir(ppy)3) into a 2,9-dimethyl-4,7-diphenyl-1,10-phenenthroline (BCP) electron transport layer. Direct exciton formation on the phosphor dopant avoids exciplex formation at the interface of unipolar hole and electron transport layers. Further, triplet exciton and carrier dynamics in a double heterostructure were investigated to determine the location and width of the exciton formation zone. High-efficiency EP is also demonstrated in a simplified two layer architecture using a 4,4′-N,N′-dicarbazole-biphenyl (CBP) ambipolar carrier transport host.",

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

note = "Funding Information: Manuscript received October 11, 2001; revised February 1, 2002. This work was supported in part by the Universal Display Corporation, the Defense Advanced Research Projects Agency, and the Air Force Office of Scientific Research. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.",

year = "2002",

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doi = "10.1109/2944.999192",

language = "English",

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AU - Adachi, Chihaya

AU - Thompson, Mark E.

AU - Forrest, Stephen R.

N1 - Funding Information: Manuscript received October 11, 2001; revised February 1, 2002. This work was supported in part by the Universal Display Corporation, the Defense Advanced Research Projects Agency, and the Air Force Office of Scientific Research. Copyright: Copyright 2008 Elsevier B.V., All rights reserved.

PY - 2002/3

Y1 - 2002/3

N2 - We discuss several device architectures leading to high-efficiency organic electrophosphorescent (EP) light emission. An external electroluminescence efficiency (ηext) of (10.0 ± 0.5)% was realized by doping fac-tris(2-phenylpyridine)iridium (Ir(ppy)3) into a 2,9-dimethyl-4,7-diphenyl-1,10-phenenthroline (BCP) electron transport layer. Direct exciton formation on the phosphor dopant avoids exciplex formation at the interface of unipolar hole and electron transport layers. Further, triplet exciton and carrier dynamics in a double heterostructure were investigated to determine the location and width of the exciton formation zone. High-efficiency EP is also demonstrated in a simplified two layer architecture using a 4,4′-N,N′-dicarbazole-biphenyl (CBP) ambipolar carrier transport host.

AB - We discuss several device architectures leading to high-efficiency organic electrophosphorescent (EP) light emission. An external electroluminescence efficiency (ηext) of (10.0 ± 0.5)% was realized by doping fac-tris(2-phenylpyridine)iridium (Ir(ppy)3) into a 2,9-dimethyl-4,7-diphenyl-1,10-phenenthroline (BCP) electron transport layer. Direct exciton formation on the phosphor dopant avoids exciplex formation at the interface of unipolar hole and electron transport layers. Further, triplet exciton and carrier dynamics in a double heterostructure were investigated to determine the location and width of the exciton formation zone. High-efficiency EP is also demonstrated in a simplified two layer architecture using a 4,4′-N,N′-dicarbazole-biphenyl (CBP) ambipolar carrier transport host.

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Architectures for efficient electrophosphorescent organic light-emitting devices

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