25 February 2014 High-power laser phosphor light source with liquid cooling for digital cinema applications
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Proceedings Volume 9005, Advances in Display Technologies IV; 900507 (2014) https://doi.org/10.1117/12.2044624
Event: SPIE OPTO, 2014, San Francisco, California, United States
Abstract
Laser excited phosphor has been used to excite phosphor material, producing high intensity light output with smaller etendue than that of LEDs with the same long lifetime. But due to the high intensity of the laser light, phosphor with organic binder burns at low power, which requires the phosphor to be deposited on a rotating wheel in practical applications. Phosphor with inorganic binders, commonly known as ceramic phosphor, on the other hand, does not burn, but efficiency goes down as temperature goes up under high power excitation. This paper describes cooling schemes in sealed chambers such that the phosphor materials using organic or inorganic binders can be liquid cooled for high efficiency operations. Confined air bubbles are introduced into the sealed chamber accommodating the differential thermal expansion of the liquid and the chamber. For even higher power operation suitable for digital cinema, a suspension of phosphor in liquid is described suitable for screen brightness of over 30,000 lumens. The aging issues of phosphor can also be solved by using replaceable phosphor cartridges.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kenneth Li, "High-power laser phosphor light source with liquid cooling for digital cinema applications", Proc. SPIE 9005, Advances in Display Technologies IV, 900507 (25 February 2014); doi: 10.1117/12.2044624; https://doi.org/10.1117/12.2044624
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