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Proceedings Paper

Single-crystal phosphors for high-brightness white LEDs/LDs
Author(s): Encarnación G. Víllora; Stelian Arjoca; Daisuke Inomata; Kiyoshi Shimamura
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Paper Abstract

White light-emitting diodes (wLEDs) are the new environmental friendly sources for general lighting purposes. For applications requiring a high-brightness, current wLEDs present overheating problems, which drastically decrease their emission efficiency, color quality and lifetime. This work gives an overview of the recent investigations on single-crystal phosphors (SCPs), which are proposed as novel alternative to conventional ceramic powder phosphors (CPPs). This totally new approach takes advantage of the superior properties of single-crystals in comparison with ceramic materials. SCPs exhibit an outstanding conversion efficiency and thermal stability up to 300°C. Furthermore, compared with encapsulated CPPs, SCPs possess a superior thermal conductivity, so that generated heat can be released efficiently. The conjunction of all these characteristics results in a low temperature rise of SCPs even under high blue irradiances, where conventional CPPs are overheated or even burned. Therefore, SCPs represent the ideal, long-demanded all-inorganic phosphors for high-brightness white light sources, especially those involving the use of high-density laser-diode beams.

Paper Details

Date Published: 8 March 2016
PDF: 11 pages
Proc. SPIE 9768, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XX, 976805 (8 March 2016); doi: 10.1117/12.2212233
Show Author Affiliations
Encarnación G. Víllora, National Institute for Materials Science (Japan)
Stelian Arjoca, National Institute for Materials Science (Japan)
Daisuke Inomata, Tamura Corp. (Japan)
Kiyoshi Shimamura, National Institute for Materials Science (Japan)

Published in SPIE Proceedings Vol. 9768:
Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XX
Heonsu Jeon; Li-Wei Tu; Michael R. Krames; Martin Strassburg, Editor(s)

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