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Proceedings Paper

Novel chip coating approaches to improve white LED technology
Author(s): Paul Hartmann; Marko Schweighart; Christian Sommer; Franz-P. Wenzl; Ernst Zinterl; Hans Hoschopf; Peter Pachler; Stefan Tasch
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Paper Abstract

Key market requirements for white LEDs, especially in the general lighting and automotive headlamp segments call for improved concepts and performance of white LEDs based on phosphor conversion. Major challenges are small emission areas, highest possible intensities, long-term color stability, and spatial homogeneity of color coordinates. On the other hand, the increasingly high radiation power of the blue LEDs poses problems for all involved materials. Various thick film coating technologies are widely used for applying the color conversion layer to the semiconductor chip. We present novel concepts based on Silicate phosphors with high performance in terms of spatial homogeneity of the emission and variability of the color temperature. Numerical calculation of the optical properties with the help of state-of-the-art simulation tools was used as a basis for the practical optimization of the layer geometries.

Paper Details

Date Published: 14 February 2008
PDF: 8 pages
Proc. SPIE 6910, Light-Emitting Diodes: Research, Manufacturing, and Applications XII, 69101A (14 February 2008); doi: 10.1117/12.764477
Show Author Affiliations
Paul Hartmann, TridonicAtco Optoelectronics GmbH (Austria)
Marko Schweighart, TridonicAtco Optoelectronics GmbH (Austria)
Christian Sommer, Joanneum Research (Austria)
Franz-P. Wenzl, Joanneum Research (Austria)
Ernst Zinterl, Joanneum Research (Austria)
Hans Hoschopf, TridonicAtco Optoelectronics GmbH (Austria)
Peter Pachler, TridonicAtco Optoelectronics GmbH (Austria)
Stefan Tasch, TridonicAtco Optoelectronics GmbH (Austria)

Published in SPIE Proceedings Vol. 6910:
Light-Emitting Diodes: Research, Manufacturing, and Applications XII
Klaus P. Streubel; Heonsu Jeon, Editor(s)

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