Red phosphor and method of preparing the same, and red light...

Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type

Reexamination Certificate

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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.

REFERENCES:
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patent: 2006/0017365 (2006-01-01), Nagatomi et al.
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patent: 03/032407 (2003-04-01), None
Cheng-Huang Kuo et al., “n-UV+Blue/Green/Red White Light Emitting Diode Lamps,”Japan J. Appl. Phys., Apr. 2003, pp. 2284-2287, vol. 42.
J.K. Sheu et al., “White-Light Emission from Near UV InGaN-GaN LED Chip Precoated with Blue/Green/Red Phosphors,”IEEE Photonics Technology Letters, Jan. 2003, pp. 18-20, vol. 15, No. 1.
European Search Report for EP 04 25 6679, dated Feb. 8, 2005.
Official Action issued by the Japanese Patent Office in corresponding JP Patent Application No. 2004-316453, Jun. 12, 2007; and English translation thereof.
Office Action from Chinese Intellectual Property Office dated Apr. 4, 2008, with translation.

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