Efficient green light emitting diodes from a phenylated derivative of poly(p-phenylene-vinylene)

F. Cacialli; R. H. Friend; N. Haylett; R. Daik; W. J. Feast; D. A. Dos Santos; J. L. Brédas

doi:10.1016/s0379-6779(96)04088-x

Efficient green light emitting diodes from a phenylated derivative of poly(p-phenylene-vinylene)

F. Cacialli^*, R. H. Friend, N. Haylett, R. Daik, W. J. Feast, D. A. Dos Santos, J. L. Brédas

^*Corresponding author for this work

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

7 Scopus citations

Abstract

We have used polyvinylcarbazole, PVK, in combination with poly(p-phenylenevinylene), PPV and a green-emitting, soluble derivative, poly(4,4′-diphenylene diphenylvinylene), PDPV, to fabricate triple-layer light-emitting diodes ITO/PPV/PVK/PDPV/Metal. We report luminances in excess of 1300 cd/m² with Al cathodes, turn-on voltages of ∼8V in structures 300 nm thick, and internal efficiencies in the range 0.4-0.8 % for Al and Ca cathodes; at least 10 times higher than for single-layer PDPV devices. In addition, the efficiencies for Ca or Al electrodes are only a factor 1.5 different. The improvements over single-layer PDPV devices are interpreted as due to better hole-injection by PPV and to the formation of a hole-barrier at the PPV/PVK interface, which forces a better balance of the electron- and hole-currents.

Original language	English (US)
Pages (from-to)	643-644
Number of pages	2
Journal	Synthetic Metals
Volume	84
Issue number	1-3
DOIs	https://doi.org/10.1016/s0379-6779(96)04088-x
State	Published - Jan 1997
Externally published	Yes

Keywords

Efficiency
Hole-barrier
Light-emitting diodes
Poly(p-phenylene vinylene)
Polyvinylcarbazole

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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Cite this

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title = "Efficient green light emitting diodes from a phenylated derivative of poly(p-phenylene-vinylene)",

abstract = "We have used polyvinylcarbazole, PVK, in combination with poly(p-phenylenevinylene), PPV and a green-emitting, soluble derivative, poly(4,4′-diphenylene diphenylvinylene), PDPV, to fabricate triple-layer light-emitting diodes ITO/PPV/PVK/PDPV/Metal. We report luminances in excess of 1300 cd/m2 with Al cathodes, turn-on voltages of ∼8V in structures 300 nm thick, and internal efficiencies in the range 0.4-0.8 % for Al and Ca cathodes; at least 10 times higher than for single-layer PDPV devices. In addition, the efficiencies for Ca or Al electrodes are only a factor 1.5 different. The improvements over single-layer PDPV devices are interpreted as due to better hole-injection by PPV and to the formation of a hole-barrier at the PPV/PVK interface, which forces a better balance of the electron- and hole-currents.",

keywords = "Efficiency, Hole-barrier, Light-emitting diodes, Poly(p-phenylene vinylene), Polyvinylcarbazole",

author = "F. Cacialli and Friend, {R. H.} and N. Haylett and R. Daik and Feast, {W. J.} and {Dos Santos}, {D. A.} and Br{\'e}das, {J. L.}",

year = "1997",

month = jan,

doi = "10.1016/s0379-6779(96)04088-x",

language = "English (US)",

volume = "84",

pages = "643--644",

journal = "Synthetic Metals",

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T1 - Efficient green light emitting diodes from a phenylated derivative of poly(p-phenylene-vinylene)

AU - Cacialli, F.

AU - Friend, R. H.

AU - Haylett, N.

AU - Daik, R.

AU - Feast, W. J.

AU - Dos Santos, D. A.

AU - Brédas, J. L.

PY - 1997/1

Y1 - 1997/1

N2 - We have used polyvinylcarbazole, PVK, in combination with poly(p-phenylenevinylene), PPV and a green-emitting, soluble derivative, poly(4,4′-diphenylene diphenylvinylene), PDPV, to fabricate triple-layer light-emitting diodes ITO/PPV/PVK/PDPV/Metal. We report luminances in excess of 1300 cd/m2 with Al cathodes, turn-on voltages of ∼8V in structures 300 nm thick, and internal efficiencies in the range 0.4-0.8 % for Al and Ca cathodes; at least 10 times higher than for single-layer PDPV devices. In addition, the efficiencies for Ca or Al electrodes are only a factor 1.5 different. The improvements over single-layer PDPV devices are interpreted as due to better hole-injection by PPV and to the formation of a hole-barrier at the PPV/PVK interface, which forces a better balance of the electron- and hole-currents.

AB - We have used polyvinylcarbazole, PVK, in combination with poly(p-phenylenevinylene), PPV and a green-emitting, soluble derivative, poly(4,4′-diphenylene diphenylvinylene), PDPV, to fabricate triple-layer light-emitting diodes ITO/PPV/PVK/PDPV/Metal. We report luminances in excess of 1300 cd/m2 with Al cathodes, turn-on voltages of ∼8V in structures 300 nm thick, and internal efficiencies in the range 0.4-0.8 % for Al and Ca cathodes; at least 10 times higher than for single-layer PDPV devices. In addition, the efficiencies for Ca or Al electrodes are only a factor 1.5 different. The improvements over single-layer PDPV devices are interpreted as due to better hole-injection by PPV and to the formation of a hole-barrier at the PPV/PVK interface, which forces a better balance of the electron- and hole-currents.

KW - Efficiency

KW - Hole-barrier

KW - Light-emitting diodes

KW - Poly(p-phenylene vinylene)

KW - Polyvinylcarbazole

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DO - 10.1016/s0379-6779(96)04088-x

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JF - Synthetic Metals

IS - 1-3

ER -

Efficient green light emitting diodes from a phenylated derivative of poly(p-phenylene-vinylene)

Abstract

Keywords

ASJC Scopus subject areas

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