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Please use this identifier to cite or link to this item: http://repository.iitr.ac.in/handle/123456789/3311
Title: Highly efficient ultra-deep blue organic light-emitting diodes with a wet- and dry-process feasible cyanofluorene acetylene based emitter
Authors: Jou J.-H.
Kumar S.
Fang P.-H.
Venkateswararao A.
Justin Thomas, K. R.
Shyue J.-J.
Wang Y.-C.
Li T.-H.
Yu H.-H.
Published in: Journal of Materials Chemistry C
Abstract: Deep blue emission is crucial for achieving high-quality display and lighting, while high-efficiency is required to obtain energy-saving devices. A wet- and dry-process feasible efficient deep-blue emitter is highly desired to realize, respectively, low cost roll-to-roll fabrication of large area and high performance devices with precise deposition of organic layers. We demonstrate here high-efficiency and ultra-deep blue organic light-emitting diodes using a cyanofluorene-acetylene conjugate based emitter, 7,7′ ((9,9-dibutyl-9H-fluorene-2,7-diyl)bis(ethyne-2,1-diyl))bis(9,9-dipropyl-9H-fluorene-2 carbonitrile) (C3FLA-2). By spin coating, C3FLA-2 shows maximum external quantum efficiency (EQE) of 6.1%, and at 100 cd m-2 for example, its color coordinates are (0.156, 0.055) with an EQE of 5.8%, the highest among all reported wet-processed deep-blue devices of fluorescent, phosphorescent, and thermally activated delayed fluorescent types. By vapor deposition, the device shows maximum EQE of 8.0%, and at 100 cd m-2 color coordinates of (0.156, 0.048) with EQE of 6.5%, the highest among all the dry-processed counterparts. The record high efficiency may be attributed to the emitter having a high quantum yield of 86%, low doping concentration preventing concentration quenching, and a suitable host facilitating an effective host-to-guest energy transfer. © The Royal Society of Chemistry 2015.
Citation: Journal of Materials Chemistry C (2015), 3(10): 2182-2194
URI: https://doi.org/10.1039/c4tc02547d
http://repository.iitr.ac.in/handle/123456789/3311
Issue Date: 2015
Publisher: Royal Society of Chemistry
ISSN: 20507534
Author Scopus IDs: 35083609400
57209547997
56378441600
37051266500
57203389297
6603332427
56070399300
56508595300
55819615900
Author Affiliations: Jou, J.-H., Department of Materials Science and Engineering, National Tsing-Hua University, Hsin-Chu, 30013, Taiwan
Kumar, S., Department of Materials Science and Engineering, National Tsing-Hua University, Hsin-Chu, 30013, Taiwan
Fang, P.-H., Department of Materials Science and Engineering, National Tsing-Hua University, Hsin-Chu, 30013, Taiwan
Venkateswararao, A., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, India
Thomas, K.R.J., Organic Materials Laboratory, Department of Chemistry, Indian Institute of Technology Roorkee, Roorkee, India
Shyue, J.-J., Research Center for Applied Sciences, Academia Sinica, Tai-Pei, 11529, Taiwan
Wang, Y.-C., Department of Materials Science and Engineering, National Tsing-Hua University, Hsin-Chu, 30013, Taiwan
Li, T.-H., Department of Materials Science and Engineering, National Tsing-Hua University, Hsin-Chu, 30013, Taiwan
Yu, H.-H., Department of Materials Science and Engineering, National Tsing-Hua University, Hsin-Chu, 30013, Taiwan
Corresponding Author: Jou, J.-H.; Department of Materials Science and Engineering, National Tsing-Hua UniversityTaiwan
Appears in Collections:Journal Publications [CY]

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