Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Reexamination Certificate
2004-11-01
2008-12-02
Williams, Joseph L. (Department: 2889)
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
C313S498000, C252S30140R
Reexamination Certificate
active
07459846
ABSTRACT:
Provided is a red phosphor represented by formula 1:in-line-formulae description="In-line Formulae" end="lead"?(Li(2-z)-xMx)(MoO4)y:Euz,Smq (1)in-line-formulae description="In-line Formulae" end="tail"?where M is an element selected from K, Mg, Na, Ca, Sr, and Ba, 0≦x≦2, 0.5≦y≦5, 0.01≦z≦1.5, and 0.001≦q≦1.0. The red phosphor has emission characteristics such as high brightness when excited by, in particular, an excitation light source of around 405 nm. The red phosphor is 6 times brighter than conventional phosphors. Furthermore, the red phosphor can be used in a red light emitting diode (LED) that has a UV excitation light source, a white LED, and an active dynamic liquid crystal device (LCD). In addition, the white LED using the red phosphor has a color rendering index of 90 or greater and so has excellent color rendition.
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Cho Jae-hee
Kang Yun-chan
Sone Cheol-soo
Buchanan Ingersoll & Ronney PC
Korea Research Institute of Chemical Technology
Quarterman Kevin
Samsung Electro-Mechanics Co. Ltd.
Williams Joseph L.
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