Compositions – Inorganic luminescent compositions – Zinc or cadmium containing
Reexamination Certificate
2006-02-28
2006-02-28
Koslow, C. Melissa (Department: 1755)
Compositions
Inorganic luminescent compositions
Zinc or cadmium containing
Reexamination Certificate
active
07005086
ABSTRACT:
A fluorescent substance is obtained by weighing and mixing CaS, Ga2S3, EuS and Ce2S3in 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 chip2and an LED chip sealing portion5, made of silicone resin and including the fluorescent substance, for enclosing the LED chip2. 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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Benalloul P. et al., “SrGa2S4: RE phosphors for full colour electroluminescent displays,” Journal of Alloys and Compounds, Elsevier Science S.A., Paris, France, vol. 275-277, Jul. 24, 1998, pp. 709-715.
Birch & Stewart Kolasch & Birch, LLP
Koslow C. Melissa
Seiwa Electric Mfg. Co., Ltd.
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