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.
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Dick K. G. de Boer, Dominique Bruls, Christoph Hoelen, 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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