Bright blue organic light-emitting diode with improved color purity using a LiF/Al cathode

S. E. Shaheen; G. E. Jabbour; M. M. Morrell; Y. Kawabe; B. Kippelen; N. Peyghambarian; M. F. Nabor; R. Schlaf; E. A. Mash; N. R. Armstrong

doi:10.1063/1.368299

Bright blue organic light-emitting diode with improved color purity using a LiF/Al cathode

S. E. Shaheen, G. E. Jabbour, M. M. Morrell, Y. Kawabe, B. Kippelen, N. Peyghambarian, M. F. Nabor, R. Schlaf, E. A. Mash, N. R. Armstrong

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298 Scopus citations

Abstract

We report a two-layer, blue organic light-emitting diode with a 4,4′-bis(2,2-diphenylvinyl)-1,1′ -biphenyl emission layer and a LiF/Al cathode which has an external quantum efficiency of 1.4% and a maximum luminance of 3000 cd/m². Insertion of the thin LiF layer results in a 50-fold increase in the device efficiency compared to a device with an aluminum only cathode, and eliminates the need for an electron-transporting layer, such as tris(8-hydroxyquinoline)aluminum. This results in a device with excellent color purity with an emission peak at 476 nm and a full width at half maximum of 78 nm. Using ultraviolet photoelectron spectroscopy, we find that the effective work-function of aluminum decreases dramatically with sub-monolayer amounts of LiF deposited on the surface.

Original language	English (US)
Pages (from-to)	2324-2327
Number of pages	4
Journal	Journal of Applied Physics
Volume	84
Issue number	4
DOIs	https://doi.org/10.1063/1.368299
State	Published - Aug 15 1998

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Bright blue organic light-emitting diode with improved color purity using a LiF/Al cathode",

abstract = "We report a two-layer, blue organic light-emitting diode with a 4,4′-bis(2,2-diphenylvinyl)-1,1′ -biphenyl emission layer and a LiF/Al cathode which has an external quantum efficiency of 1.4% and a maximum luminance of 3000 cd/m2. Insertion of the thin LiF layer results in a 50-fold increase in the device efficiency compared to a device with an aluminum only cathode, and eliminates the need for an electron-transporting layer, such as tris(8-hydroxyquinoline)aluminum. This results in a device with excellent color purity with an emission peak at 476 nm and a full width at half maximum of 78 nm. Using ultraviolet photoelectron spectroscopy, we find that the effective work-function of aluminum decreases dramatically with sub-monolayer amounts of LiF deposited on the surface.",

author = "Shaheen, {S. E.} and Jabbour, {G. E.} and Morrell, {M. M.} and Y. Kawabe and B. Kippelen and N. Peyghambarian and Nabor, {M. F.} and R. Schlaf and Mash, {E. A.} and Armstrong, {N. R.}",

year = "1998",

month = aug,

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doi = "10.1063/1.368299",

language = "English (US)",

volume = "84",

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journal = "Journal of Applied Physics",

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T1 - Bright blue organic light-emitting diode with improved color purity using a LiF/Al cathode

AU - Shaheen, S. E.

AU - Jabbour, G. E.

AU - Morrell, M. M.

AU - Kawabe, Y.

AU - Kippelen, B.

AU - Peyghambarian, N.

AU - Nabor, M. F.

AU - Schlaf, R.

AU - Mash, E. A.

AU - Armstrong, N. R.

PY - 1998/8/15

Y1 - 1998/8/15

N2 - We report a two-layer, blue organic light-emitting diode with a 4,4′-bis(2,2-diphenylvinyl)-1,1′ -biphenyl emission layer and a LiF/Al cathode which has an external quantum efficiency of 1.4% and a maximum luminance of 3000 cd/m2. Insertion of the thin LiF layer results in a 50-fold increase in the device efficiency compared to a device with an aluminum only cathode, and eliminates the need for an electron-transporting layer, such as tris(8-hydroxyquinoline)aluminum. This results in a device with excellent color purity with an emission peak at 476 nm and a full width at half maximum of 78 nm. Using ultraviolet photoelectron spectroscopy, we find that the effective work-function of aluminum decreases dramatically with sub-monolayer amounts of LiF deposited on the surface.

AB - We report a two-layer, blue organic light-emitting diode with a 4,4′-bis(2,2-diphenylvinyl)-1,1′ -biphenyl emission layer and a LiF/Al cathode which has an external quantum efficiency of 1.4% and a maximum luminance of 3000 cd/m2. Insertion of the thin LiF layer results in a 50-fold increase in the device efficiency compared to a device with an aluminum only cathode, and eliminates the need for an electron-transporting layer, such as tris(8-hydroxyquinoline)aluminum. This results in a device with excellent color purity with an emission peak at 476 nm and a full width at half maximum of 78 nm. Using ultraviolet photoelectron spectroscopy, we find that the effective work-function of aluminum decreases dramatically with sub-monolayer amounts of LiF deposited on the surface.

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JO - Journal of Applied Physics

JF - Journal of Applied Physics

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ER -

Bright blue organic light-emitting diode with improved color purity using a LiF/Al cathode

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