Oxynitride phosphors for use in lighting applications having...

Details Oxynitride phosphors for use in lighting applications having... Oxynitride phosphors for use in lighting applications having...

2005-03-01

2008-10-21

Patel, Nimeshkumar D. (Department: 2879)

Electric lamp and discharge devices

With luminescent solid or liquid material

Solid-state type

C252S30140R, C252S30140F

Reexamination Certificate

active

07439668

ABSTRACT:
Disclosed are oxynitride phosphor compositions having the formula (RE1-xCex)3Ala-y-z-wSiyGazScwO12-yNy, where RE is at least one of Lu, Gd, Y, and Tb, 0.001≦x≦0.10, 0≦w≦2, 0.001≦y≦0.50, 0≦z≦4.999, and 4.5≦a≦5.0. When combined with radiation from a blue or UV LED, these phosphors can provide light sources with good color quality having high CRI over a large color temperature range. Also disclosed are blends of the above oxynitride phosphors and additional phosphors.

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W. Lehmann and F.M. Ryan, “Cathodulminescence of CaS:Ce3+and CaS:Eu2+Phosphors”, J. Electrochem. Soc., Mar. 1971, vol. 118, pp. 477-482.

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