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:10.1063/1.117001

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

57 Scopus citations

Abstract

We have used polyvinylcarbazole, PVK, in combination with poly(p-phenylene vinylene), PPV and a green-emitting, soluble derivative, poly(4,4′-diphenylene diphenylvinylene) or briefly PDPV, to fabricate triple-layer light-emitting diodes PPV/PVK/PDPV/metal, with indium tin oxide as the anode. We report luminances in excess of 1300 cd/m² with Al cathodes, turn-on voltages of ∼8 V in structures 300 nm thick, and internal efficiencies in the range 0.4%-0.8% for Al and Ca cathodes; at least ten times higher than for single-layer PDPV devices. Quantum efficiencies for Ca or Al electrodes are only a factor 1.5 different. The improvements over single-layer PDPV devices are considered to be 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)	3794-3796
Number of pages	3
Journal	Applied Physics Letters
Volume	69
Issue number	25
DOIs	https://doi.org/10.1063/1.117001
State	Published - Dec 16 1996
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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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-phenylene vinylene), PPV and a green-emitting, soluble derivative, poly(4,4′-diphenylene diphenylvinylene) or briefly PDPV, to fabricate triple-layer light-emitting diodes PPV/PVK/PDPV/metal, with indium tin oxide as the anode. We report luminances in excess of 1300 cd/m2 with Al cathodes, turn-on voltages of ∼8 V in structures 300 nm thick, and internal efficiencies in the range 0.4%-0.8% for Al and Ca cathodes; at least ten times higher than for single-layer PDPV devices. Quantum efficiencies for Ca or Al electrodes are only a factor 1.5 different. The improvements over single-layer PDPV devices are considered to be 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.",

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 = "1996",

month = dec,

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doi = "10.1063/1.117001",

language = "English (US)",

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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 - 1996/12/16

Y1 - 1996/12/16

N2 - We have used polyvinylcarbazole, PVK, in combination with poly(p-phenylene vinylene), PPV and a green-emitting, soluble derivative, poly(4,4′-diphenylene diphenylvinylene) or briefly PDPV, to fabricate triple-layer light-emitting diodes PPV/PVK/PDPV/metal, with indium tin oxide as the anode. We report luminances in excess of 1300 cd/m2 with Al cathodes, turn-on voltages of ∼8 V in structures 300 nm thick, and internal efficiencies in the range 0.4%-0.8% for Al and Ca cathodes; at least ten times higher than for single-layer PDPV devices. Quantum efficiencies for Ca or Al electrodes are only a factor 1.5 different. The improvements over single-layer PDPV devices are considered to be 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-phenylene vinylene), PPV and a green-emitting, soluble derivative, poly(4,4′-diphenylene diphenylvinylene) or briefly PDPV, to fabricate triple-layer light-emitting diodes PPV/PVK/PDPV/metal, with indium tin oxide as the anode. We report luminances in excess of 1300 cd/m2 with Al cathodes, turn-on voltages of ∼8 V in structures 300 nm thick, and internal efficiencies in the range 0.4%-0.8% for Al and Ca cathodes; at least ten times higher than for single-layer PDPV devices. Quantum efficiencies for Ca or Al electrodes are only a factor 1.5 different. The improvements over single-layer PDPV devices are considered to be 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.

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JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 25

ER -

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

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