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Proceedings Paper

The impact of individual materials parameters on color temperature reproducibility among phosphor converted LED sources
Author(s): Susanne Schweitzer; Wolfgang Nemitz; Christian Sommer; Paul Hartmann; Paul Fulmek; Johann Nicolics; 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 color temperature reproducibility under control. In this regard, it is imperative to understand how compositional, optical and materials properties of the color conversion element (CCE), which typically consists of phosphor particles embedded in a transparent matrix material, affect the constancy of a desired color temperature of a white LED source. In this contribution we use an LED assembly consisting of an LED die mounted on a printed circuit board (PCB) by chip-on-board technology and a CCE with a glob-top configuration as a model system and discuss the impact of potential sources for color temperature deviation among individual devices. Parameters that are investigated include imprecisions in the amount of materials deposition, deviations from the target value for the phosphor concentration in the matrix material, deviations from the target value for the particle sizes of the phosphor material, deviations from the target values for the refractive indexes of phosphor and matrix material as well as deviations from the reflectivity of the substrate surface. From these studies, some general conclusions can be drawn which of these parameters have the largest impact on color deviation and have to be controlled most precisely in a fabrication process in regard of color temperature reproducibility among individual white LED sources.

Paper Details

Date Published: 25 September 2014
PDF: 8 pages
Proc. SPIE 9190, Thirteenth International Conference on Solid State Lighting, 91900S (25 September 2014); doi: 10.1117/12.2061921
Show Author Affiliations
Susanne Schweitzer, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Wolfgang Nemitz, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Christian Sommer, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Paul Hartmann, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)
Paul Fulmek, Technische Univ. Wien (Austria)
Johann Nicolics, Technische Univ. Wien (Austria)
Peter Pachler, Tridonic Jennersdorf GmbH (Austria)
Hans Hoschopf, Tridonic Jennersdorf GmbH (Austria)
Franz Schrank, Tridonic Jennersdorf GmbH (Austria)
Gregor Langer, Austria Technologie & Systemtechnik Aktiengesellschaft (Austria)
Franz P. Wenzl, JOANNEUM RESEARCH Forschungsgesellschaft mbH (Austria)


Published in SPIE Proceedings Vol. 9190:
Thirteenth International Conference on Solid State Lighting
Matthew H. Kane; Jianzhong Jiao; Nikolaus Dietz; Jian-Jang Huang, Editor(s)

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