Highly efficient ultra-deep blue organic light-emitting diodes with a wet- and dry-process feasible cyanofluorene acetylene based emitter

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 an...

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Published in:Journal of materials chemistry. C, Materials for optical and electronic devices Materials for optical and electronic devices, 2015-03, Vol.3 (10), p.2182-2194
Main Authors: Jou, Jwo-Huei, Kumar, Sudhir, Fang, Po-Hsun, Venkateswararao, A., Thomas, K. R. Justin, Shyue, Jing-Jong, Wang, Ya-Chi, Li, Tsung-Han, Yu, Hui-Huan
Format: Article
Language:English
Subjects:
Color
Devices
Doping
Emittance
Emitters (electron)
Illumination
Lighting
Organic light-emitting diodes
Spin coating
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Summary: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-9 H -fluorene-2,7-diyl)bis(ethyne-2,1-diyl))bis(9,9-dipropyl-9 H -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.
ISSN:2050-7526
2050-7534
DOI:10.1039/C4TC02547D