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14 September 2007 Silicate phosphors and white LED technology: improvements and opportunities
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With the advent of a new generation of high brightness LEDs especially in the blue spectral range, white light technology based on phosphor conversion gains maturity for a successful penetration of, e.g., the general lighting market within the next years. Major challenges ahead are originating from the specific demands of the markets on small emission areas, highest possible intensities, long-term color stability, and spatial homogeneity of color coordinates. The LED industry more or less relies on the conversion phosphor classes of YAG, Sulfates, and Silicates, embedded in silicone matrices. A number of conformal coating technologies are in use. The optimization of the coating geometries with the help of software simulation offers a high potential for increased angular color homogeneity and high package densities, especially when secondary optics is in use. We report on recent progress in simulating parameters for improved white LEDs manufactured by coating technologies.
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Christian Sommer, Franz P. Wenzl, Paul Hartmann, Peter Pachler, Marko Schweighart, Guenther Leising, and Stefan Tasch "Silicate phosphors and white LED technology: improvements and opportunities", Proc. SPIE 6669, Seventh International Conference on Solid State Lighting, 66690O (14 September 2007);

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