Fluorescent substance, light-emitting diode and method for producing fluorescent substance
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United States of America Patent
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Feb 28, 2006
Grant Date -
May 13, 2004
app pub date -
Nov 6, 2003
filing date -
Nov 8, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A fluorescent substance is obtained by weighing and mixing CaS, Ga2S3, EuS and Ce2S3 in a mole ratio of (1-x):a:x:y (wherein 0.001≦x≦0.2, 0.0001≦y≦0.02 and 0.5≦a≦5) and by sintering the mixture. A light-emitting diode comprises an LED chip 2 and an LED chip sealing portion 5, made of silicone resin and including the fluorescent substance, for enclosing the LED chip 2. Hence, a fluorescent substance that is excited by light having a predetermined wavelength to emit light, a light-emitting diode having excellent luminous efficiency and luminous intensity, and a method for producing the fluorescent substance are attained by the present invention.
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