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Proceedings Paper

LED light engine concept with ultra-high scalable luminance
Author(s): Christoph Hoelen; Dick de Boer; Dominique Bruls; Joost van der Eyden; Rolf Koole; Yun Li; Mo Mirsadeghi; Vincent Vanbroekhoven; John-John Van den Bergh; Patrick Van de Voorde
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Paper Abstract

Although LEDs have been introduced successfully in many general lighting applications during the past decade, high brightness light source applications are still suffering from the limited luminance of LEDs. High power LEDs are generally limited in luminance to ca 100 Mnit (108 lm/m2sr) or less, while dedicated devices for projection may achieve luminance values up to ca 300 Mnit with phosphor converted green. In particular for high luminous flux applications with limited étendue, like in front projection systems, only very modest luminous flux values in the beam can be achieved with LEDs compared to systems based on discharge lamps. In this paper we introduce a light engine concept based on a light converter rod pumped with blue LEDs that breaks through the étendue and brightness limits of LEDs, enabling LED light source luminance values that are more than 4 times higher than what can be achieved with LEDs so far. In LED front projection systems, green LEDs are the main limiting factor. With our green light emitting modules, peak luminance values well above 1.2 Gnit have been achieved, enabling doubling of the screen brightness of LED based DLP projection systems, and even more when this technology is applied to other colors as well. This light source concept, introduced as the ColorSpark High Lumen Density (HLD) LED technology, enables a breakthrough in the performance of LED-based light engines not only for projection, where >2700 ANSI lm was demonstrated, but for a wide variety of high brightness applications.

Paper Details

Date Published: 8 March 2016
PDF: 12 pages
Proc. SPIE 9768, Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XX, 976810 (8 March 2016); doi: 10.1117/12.2224042
Show Author Affiliations
Christoph Hoelen, Philips Lighting Research (Netherlands)
Dick de Boer, Philips Lighting Research (Netherlands)
Dominique Bruls, Philips Lighting Research (Netherlands)
Joost van der Eyden, Philips Lighting B.V. (Netherlands)
Rolf Koole, Philips Lighting (Belgium)
Yun Li, Philips Lighting (China)
Mo Mirsadeghi, Philips Innovation Services (Netherlands)
Vincent Vanbroekhoven, Philips Lighting N.V. (Belgium)
John-John Van den Bergh, Philips Lighting N.V. (Belgium)
Patrick Van de Voorde, Philips Lighting N.V. (Belgium)

Published in SPIE Proceedings Vol. 9768:
Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XX
Heonsu Jeon; Li-Wei Tu; Michael R. Krames; Martin Strassburg, Editor(s)

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