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タイトル: | Enhanced photoluminescence and directional white-light generation by plasmonic array |
著者: | Kamakura, Ryosuke Murai, Shunsuke https://orcid.org/0000-0002-4597-973X (unconfirmed) Yokobayashi, Yusuke Takashima, Keijiro Kuramoto, Masaru Fujita, Koji https://orcid.org/0000-0002-1700-0889 (unconfirmed) Tanaka, Katsuhisa https://orcid.org/0000-0002-1409-2802 (unconfirmed) |
著者名の別形: | 鎌倉, 涼介 村井, 俊介 横林, 裕介 高島, 啓次郎 倉本, 大 藤田, 晃司 田中, 勝久 |
発行日: | 7-Dec-2018 |
出版者: | AIP Publishing |
誌名: | Journal of Applied Physics |
巻: | 124 |
号: | 21 |
論文番号: | 213105 |
抄録: | White 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. |
記述: | 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. |
著作権等: | © 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/). |
URI: | http://hdl.handle.net/2433/235593 |
DOI(出版社版): | 10.1063/1.5050993 |
関連リンク: | https://www.kyoto-u.ac.jp/ja/research-news/2018-12-06 |
出現コレクション: | 学術雑誌掲載論文等 |
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