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Issue 10, 2015
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Highly efficient ultra-deep blue organic light-emitting diodes with a wet- and dry-process feasible cyanofluorene acetylene based emitter

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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.

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

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Publication details

The article was received on 07 Nov 2014, accepted on 14 Jan 2015 and first published on 16 Jan 2015


Article type: Paper
DOI: 10.1039/C4TC02547D
Citation: J. Mater. Chem. C, 2015,3, 2182-2194
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    Highly efficient ultra-deep blue organic light-emitting diodes with a wet- and dry-process feasible cyanofluorene acetylene based emitter

    J. Jou, S. Kumar, P. Fang, A. Venkateswararao, K. R. J. Thomas, J. Shyue, Y. Wang, T. Li and H. Yu, J. Mater. Chem. C, 2015, 3, 2182
    DOI: 10.1039/C4TC02547D

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