期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 3, 期 10, 页码 2182-2194出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4tc02547d
关键词
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资金
- National Science Council [100-2119-M-007-011-MY3, 103-2923-E-007-003-MY3]
- Ministry of Economic Affairs [MEA 102-EC-17-A-07-S1-181]
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, 7,70 ((9,9-ibutyl-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.
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