Silicate phosphors and white LED technology: improvements and opportunities
2007
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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