29 April 2016 LED-based projection source based on luminescent concentration
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The concept of an LED-based source with high lumen density is described. It contains a luminescent rod in which LED light is converted to light with a longer wavelength that is extracted from a small face of the rod. The fundamental limitations and possibilities are discussed, as well as the constituents needed. Results are shown for two realized high lumen density sources. A source with YAG:Ce as phosphor is extensively characterized and the results are compared to modeling results. A source with an optimized green emitting phosphor is used for projection. With 64 pump LEDs at 490 W peak electrical input and 50% duty cycle, a peak luminous flux of 18000 lm and a peak luminance of over 1000 cd/mm2 is obtained, with an efficacy of 37 peak lm/W.
© (2016) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Dick K. G. de Boer, Dick K. G. de Boer, Dominique Bruls, Dominique Bruls, Christoph Hoelen, Christoph Hoelen, Henri Jagt, Henri Jagt, "LED-based projection source based on luminescent concentration", Proc. SPIE 9896, Optics, Photonics and Digital Technologies for Imaging Applications IV, 989606 (29 April 2016); doi: 10.1117/12.2225614; https://doi.org/10.1117/12.2225614


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