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Reduced molybdenum oxide as an efficient electron injection layer in polymer light-emitting diodes

Reduced molybdenum oxide as an efficient electron injection layer in polymer light-emitting diodes
Reduced molybdenum oxide as an efficient electron injection layer in polymer light-emitting diodes

We report a significant improvement in the performance of single layer polymer light-emitting diodes (PLEDs), based on the green emitting copolymer poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(1,4-benzo-{2, 1′,3}-thiadiazole)] , upon inserting a very thin layer of partially reduced molybdenum oxide (MoOx, where x=2.7) at the polymer/Al cathode interface. Both fully oxidized (x=3) and partially reduced (x=2.7) thin molybdenum oxide layers were investigated as electron injection layers and their influence on PLED device performance was examined. Improved current density, luminance, and efficiency was achieved only in the case of devices with a thin partially reduced MoO2.7 film as electron injection layer, as a result of improved electron injection and more facile transfer at the modified polymer/Al interface.

0003-6951
Vasilopoulou, Maria
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Palilis, Leonidas C.
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Georgiadou, Dimitra G.
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Argitis, Panagiotis
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Kennou, Stella
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Sygellou, Labrini
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Kostis, Ioannis
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Papadimitropoulos, Giorgos
b4f1ecba-cc8a-4882-99a5-a29354a9bca7
Konofaos, Nikos
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Iliadis, Agis A.
4009bfb1-8f1d-483a-aa6b-ed81ed539b8c
Davazoglou, Dimitris
a946cf5d-287a-4734-ba55-b180ab4525ed
Vasilopoulou, Maria
aad1381e-d091-4090-8c7c-b74bed22393d
Palilis, Leonidas C.
b09e9554-54da-4be5-aa08-bda894e2b86f
Georgiadou, Dimitra G.
84977176-3678-4fb3-a3dd-2044a49c853b
Argitis, Panagiotis
ab9c4ea6-3dd2-4e34-935d-81bfb360f358
Kennou, Stella
7ca6a6bd-6a05-4110-b3da-c8807f798370
Sygellou, Labrini
87e6de58-e0d8-46b1-aaa9-0d2150379562
Kostis, Ioannis
681af9a6-5162-4f35-b6b1-365ea7ce7e47
Papadimitropoulos, Giorgos
b4f1ecba-cc8a-4882-99a5-a29354a9bca7
Konofaos, Nikos
18d67477-5af4-4d52-aa0c-3b933e96fc50
Iliadis, Agis A.
4009bfb1-8f1d-483a-aa6b-ed81ed539b8c
Davazoglou, Dimitris
a946cf5d-287a-4734-ba55-b180ab4525ed

Vasilopoulou, Maria, Palilis, Leonidas C., Georgiadou, Dimitra G., Argitis, Panagiotis, Kennou, Stella, Sygellou, Labrini, Kostis, Ioannis, Papadimitropoulos, Giorgos, Konofaos, Nikos, Iliadis, Agis A. and Davazoglou, Dimitris (2011) Reduced molybdenum oxide as an efficient electron injection layer in polymer light-emitting diodes. Applied Physics Letters, 98 (12), [123301]. (doi:10.1063/1.3557502).

Record type: Article

Abstract

We report a significant improvement in the performance of single layer polymer light-emitting diodes (PLEDs), based on the green emitting copolymer poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(1,4-benzo-{2, 1′,3}-thiadiazole)] , upon inserting a very thin layer of partially reduced molybdenum oxide (MoOx, where x=2.7) at the polymer/Al cathode interface. Both fully oxidized (x=3) and partially reduced (x=2.7) thin molybdenum oxide layers were investigated as electron injection layers and their influence on PLED device performance was examined. Improved current density, luminance, and efficiency was achieved only in the case of devices with a thin partially reduced MoO2.7 film as electron injection layer, as a result of improved electron injection and more facile transfer at the modified polymer/Al interface.

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e-pub ahead of print date: 22 March 2011

Identifiers

Local EPrints ID: 439809
URI: http://eprints.soton.ac.uk/id/eprint/439809
ISSN: 0003-6951
PURE UUID: fc35cd2b-7c41-4145-86d2-7962495a40b8
ORCID for Dimitra G. Georgiadou: ORCID iD orcid.org/0000-0002-2620-3346

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Date deposited: 05 May 2020 16:30
Last modified: 07 Oct 2020 02:27

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Contributors

Author: Maria Vasilopoulou
Author: Leonidas C. Palilis
Author: Panagiotis Argitis
Author: Stella Kennou
Author: Labrini Sygellou
Author: Ioannis Kostis
Author: Giorgos Papadimitropoulos
Author: Nikos Konofaos
Author: Agis A. Iliadis
Author: Dimitris Davazoglou

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