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Proceedings Paper

The impact of the silicone encapsulation layers on the white light quality of phosphor converted LEDs
Author(s): Susanne Schweitzer; Christian Sommer; Paul Hartmann; Wolfgang Nemitz; Peter Pachler; Hans Hoschopf; Gregor Langer; Paul Fulmek; Johann Nicolics; Franz P. Wenzl
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Paper Abstract

For a systematic approach to improve the white light quality of phosphor converted light-emitting diodes (LEDs) for general lighting applications it is imperative to get the sources of error for color constancy under control. In this context, it is essential to gain a deeper insight how the individual components of an LED package may contribute to color deviation. Typically, both monochromatic and phosphor converted light-emitting diodes are finally encapsulated by a pristine silicone layer in order to prevent mechanical damage of the LED packages. In this contribution we focus on the shapes of such encapsulation layers and discuss, based on an optical simulation procedure, their impact on the color temperatures of phosphor converted white LEDs as well as the ramifications of manufacturing imprecision of these shapes on the constancy and reproducibility of a desired color temperature.

Paper Details

Date Published: 15 October 2012
PDF: 8 pages
Proc. SPIE 8484, Twelfth International Conference on Solid State Lighting and Fourth International Conference on White LEDs and Solid State Lighting, 84840N (15 October 2012); doi: 10.1117/12.929950
Show Author Affiliations
Susanne Schweitzer, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Christian Sommer, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Paul Hartmann, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Wolfgang Nemitz, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Peter Pachler, Tridonic Jennersdorf GmbH (Austria)
Hans Hoschopf, Tridonic Jennersdorf GmbH (Austria)
Gregor Langer, Austria Technologie & Systemtechnik AG (Austria)
Paul Fulmek, Vienna Univ. of Technology (Austria)
Johann Nicolics, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Franz P. Wenzl, Institute for Surface Technologies and Photonics, Weiz (Austria)


Published in SPIE Proceedings Vol. 8484:
Twelfth International Conference on Solid State Lighting and Fourth International Conference on White LEDs and Solid State Lighting
Matthew H. Kane; Christian Wetzel; Jian-Jang Huang; Ian T. Ferguson, Editor(s)

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