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High lumen density sources based on LED-pumped phosphor rods: opportunities for performance improvement
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Paper Abstract

Recently, LED-based sources with high luminance (109 cd/m2 ) have been developed. These sources can be applied in projection systems, as well as in other applications requiring high luminance. The technology makes use of a transparent phosphor rod that is pumped by a multitude of blue LEDs. Most of the converted light is guided in the rod towards one of its small sides, where it is extracted using suitable extraction optics. The radiant conversion efficiency (blue flux to converted flux) is presently approaching 0.3. The causes for this limitation are discussed. The available phosphor materials emit light in various wavelength regions, ranging from green to yellow and red. These can be used in various light sources, e.g. for DLP and LCD projection.

Paper Details

Date Published: 6 September 2017
PDF: 6 pages
Proc. SPIE 10378, Sixteenth International Conference on Solid State Lighting and LED-based Illumination Systems, 103780M (6 September 2017); doi: 10.1117/12.2275729
Show Author Affiliations
Dick K. G. de Boer, Philips Lighting Research (Netherlands)
Dominique Bruls, Philips Lighting Research (Netherlands)
Christoph Hoelen, Philips Lighting Research (Netherlands)
Henri Jagt, Philips Lighting Research (Netherlands)


Published in SPIE Proceedings Vol. 10378:
Sixteenth International Conference on Solid State Lighting and LED-based Illumination Systems
Nikolaus Dietz; Ian T. Ferguson, Editor(s)

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