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dc.contributor.authorKamakura, Ryosuke
dc.contributor.authorMurai, Shunsuke
dc.contributor.authorYokobayashi, Yusuke
dc.contributor.authorTakashima, Keijiro
dc.contributor.authorKuramoto, Masaru
dc.contributor.authorFujita, Koji
dc.contributor.authorTanaka, Katsuhisa
dc.contributor.alternative鎌倉, 涼介
dc.contributor.alternative村井, 俊介
dc.contributor.alternative横林, 裕介
dc.contributor.alternative高島, 啓次郎
dc.contributor.alternative倉本, 大
dc.contributor.alternative藤田, 晃司
dc.contributor.alternative田中, 勝久
dc.date.accessioned2018-12-06T05:01:01Z-
dc.date.available2018-12-06T05:01:01Z-
dc.date.issued2018-12-07
dc.identifier.issn0021-8979
dc.identifier.urihttp://hdl.handle.net/2433/235593-
dc.description次世代の指向性白色光源の開発に成功 --ナノアンテナで明日を照らす--. 京都大学プレスリリース. 2018-12-06.
dc.description.abstractWhite light-emitting diodes (LEDs), light sources that combine blue LEDs and yellow phosphors, are equipped with bulky optics such as lenses, mirrors, and/or reflectors to shape the light into the required directions. The presence of bulky optics causes optical loss and limits the design. Here, a periodic array of metallic nanocylinders, which exhibits a high scattering efficiency owing to the excitation of localized surface plasmon resonance, is proposed as an alternative means of achieving a directional output without the limitations of bulky optics. A prototype of a directional light emitter is fabricated consisting of an Al nanocylinder array on a yellow phosphor plate and a blue laser. The array shapes the yellow luminescence into the forward direction and generates directional quasi-white light (correlated color temperature of 4900 K). The intensity enhancement reaches a factor of five in the forward direction and is further improved up to a factor of seven by the deposition of a multilayer dichroic mirror on the back side of the phosphor plate, resulting in conversion efficiencies as high as 90 lm/W. Our results pave the way toward the development of efficient and compact directional white-light-source devices without any bulky optics.
dc.format.mimetypeapplication/pdf
dc.language.isoeng
dc.publisherAIP Publishing
dc.rights© 2018 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
dc.titleEnhanced photoluminescence and directional white-light generation by plasmonic array
dc.type.niitypeJournal Article
dc.identifier.jtitleJournal of Applied Physics
dc.identifier.volume124
dc.identifier.issue21
dc.relation.doi10.1063/1.5050993
dc.textversionpublisher
dc.identifier.artnum213105
dc.identifier.kaken16H04217
dc.relation.urlhttp://www.kyoto-u.ac.jp/ja/research/research_results/2018/181206_1.html
出現コレクション:学術雑誌掲載論文等

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