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Proceedings Paper

Thermal and optical aspects of glob-top design for phosphor converted white LED light sources
Author(s): Christian Sommer; Paul Fulmek; Johann Nicolics; Susanne Schweitzer; Wolfgang Nemitz; Paul Hartmann; Peter Pachler; Hans Hoschopf; Franz Schrank; Gregor Langer; 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 individual sources of error for correlated color temperature (CCT) reproducibility and maintenance under control. In this regard, it is of essential importance to understand how geometrical, optical and thermal properties of the color conversion elements (CCE), which typically consist of phosphor particles embedded in a transparent matrix material, affect the constancy of a desired CCT value. In this contribution we use an LED assembly consisting of an LED die mounted on a printed circuit board by chip-on-board technology and a CCE with a glob-top configuration on the top of it as a model system and discuss the impact of the CCE shape and size on CCT constancy with respect to substrate reflectivity and thermal load of the CCEs. From these studies, some general conclusions for improved glob-top design can be drawn.

Paper Details

Date Published: 30 September 2013
PDF: 8 pages
Proc. SPIE 8835, LED-based Illumination Systems, 88350J (30 September 2013); doi: 10.1117/12.2024887
Show Author Affiliations
Christian Sommer, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Paul Fulmek, Technische Univ. Wien (Austria)
Johann Nicolics, Technische Univ. Wien (Austria)
Susanne Schweitzer, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Wolfgang Nemitz, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Paul Hartmann, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Peter Pachler, Tridonic Jennersdorf GmbH (Austria)
Hans Hoschopf, Tridonic Jennersdorf GmbH (Austria)
Franz Schrank, Tridonic Jennersdorf GmbH (Austria)
Gregor Langer, Austria Technologie & Systemtechnik AG (Austria)
Franz P. Wenzl, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)

Published in SPIE Proceedings Vol. 8835:
LED-based Illumination Systems
Jianzhong Jiao, Editor(s)

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