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Ceramic phosphor wheels for high luminance SSL-light sources with >500W of laser power for digital projection
Author(s): Volker Hagemann; Albrecht Seidl; Günter Weidmann
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Paper Abstract

Lighting applications that require luminance levels above several 100 cd/mm2 cannot be addressed with LEDs today. Laser pumped phosphor (LPP) light sources are an emerging technology that helps to address this field with solid state lighting (SSL). Digital projectors with a LPP light source are already commercially available. They make use of phosphor wheels that are irradiated with blue laser light to generate light via photo-luminescence. The power limit of the phosphor wheel is determined by the peak temperature of the phosphor at the laser spot. We present experimental and numerical studies on the temperature contribution of both, the wheel geometry and the phosphor material, and show that ceramic phosphor rings are the best choice for high power and high luminance applications. Results for power levels close to 700W and an irradiance above 180 W/mm2 are presented.

Paper Details

Date Published: 1 March 2019
PDF: 16 pages
Proc. SPIE 10940, Light-Emitting Devices, Materials, and Applications, 1094017 (1 March 2019); doi: 10.1117/12.2508860
Show Author Affiliations
Volker Hagemann, SCHOTT AG (Germany)
Albrecht Seidl, SCHOTT AG (Germany)
Günter Weidmann, SCHOTT AG (Germany)

Published in SPIE Proceedings Vol. 10940:
Light-Emitting Devices, Materials, and Applications
Jong Kyu Kim; Michael R. Krames; Martin Strassburg, Editor(s)

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