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Proceedings Paper

Silicate phosphors and white LED technology: improvements and opportunities
Author(s): Christian Sommer; Franz P. Wenzl; Paul Hartmann; Peter Pachler; Marko Schweighart; Guenther Leising; Stefan Tasch
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Paper Abstract

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.

Paper Details

Date Published: 14 September 2007
PDF: 8 pages
Proc. SPIE 6669, Seventh International Conference on Solid State Lighting, 66690O (14 September 2007); doi: 10.1117/12.734191
Show Author Affiliations
Christian Sommer, Joanneum Research Forschungsges mbH (Austria)
Franz P. Wenzl, Joanneum Research Forschungsges mbH (Austria)
Paul Hartmann, TridonicAtco Optoelectronics GmbH (Austria)
Peter Pachler, TridonicAtco Optoelectronics GmbH (Austria)
Marko Schweighart, TridonicAtco Optoelectronics GmbH (Austria)
Guenther Leising, Joanneum Research Forschungsges mbH (Austria)
Graz Univ. of Technology (Austria)
Stefan Tasch, TridonicAtco Optoelectronics GmbH (Austria)

Published in SPIE Proceedings Vol. 6669:
Seventh International Conference on Solid State Lighting
Ian T. Ferguson; Nadarajah Narendran; Tsunemasa Taguchi; Ian E. Ashdown, Editor(s)

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