Light source with wavelength conversion device and filter plate
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United States of America Patent
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Jul 7, 2015
Grant Date -
Sep 5, 2013
app pub date -
Aug 27, 2012
filing date -
Aug 27, 2011
priority date (Note) -
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status (Latency Note)
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Abstract
A light source device uses a wavelength down conversion material for absorbing an excitation light and generating a converted light, and a color filter for filtering the converted light to generate a different color light as output. The wavelength conversion material is a yellow or green phosphor which absorbs blue or UV light and generates a yellow or green converted light, which has a sufficiently wide spectrum to cover some of the red color region. The color filter only allows the red component of the converted light to be output. This system is more energy efficient than using a red phosphor. This light source may be implemented as a moving phosphor wheel having multiple segments, one of which being the yellow or green phosphor with the corresponding color filter, the other segments being used to generate other colored lights such as green and blue lights.
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