White-light emitting device and preparation method and application of the same
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United States of America Patent
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Nov 20, 2012
Grant Date -
Apr 7, 2011
app pub date -
Oct 5, 2010
filing date -
Oct 5, 2009
priority date (Note) -
Expired
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Abstract
A white-light emitting device and its preparation method are provided. The white-light emitting device comprises an ultraviolet (UV) light emitting diode (LED) chip, a first phosphor, and a second phosphor, wherein the UV LED chip generates a first radiation; the first phosphor is composed of Zn(C3N2H4)2 powder and is excited by the first radiation to generate a second radiation; and the second phosphor is excited by the first radiation and/or the second radiation to generate a third radiation. The third radiation is then mixed with the first radiation and/or the second radiation to generate a white light.
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