UV-emitting phosphor and lamp containing same

Details UV-emitting phosphor and lamp containing same UV-emitting phosphor and lamp containing same

2006-04-06

2008-07-08

Koslow, C. Melissa (Department: 1793)

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

C313S486000, C313S643000

Reexamination Certificate

active

07396491

ABSTRACT:
A UV-emitting phosphor and lamp containing same are described. The phosphor is a praseodymium-activated pyrophosphate-based phosphor which may be represented by the general formula (Ca2-x,Srx)P2O7:Pr where 0≦x≦2. The phosphor is excitable by vacuum ultraviolet (VUV) radiation and in particular it may be excited by Xe-excimer discharges and thereby provide a Hg-free UV-emitting lamp. The phosphor exhibits a broad emission in the UVC region in the wavelength range from about 220 nm to about 280 nm with the peak emission occurring in the wavelength range from about 230 nm to about 240 nm. The emission characteristics of the phosphor may be varied depending on the ratio of Sr/Ca.

REFERENCES:
patent: 3882041 (1975-05-01), Royce
patent: 4757233 (1988-07-01), Peters et al.
patent: 6246171 (2001-06-01), Vollkommer et al.
patent: 6398970 (2002-06-01), Juestel et al.
patent: 6469435 (2002-10-01), Seibold et al.
patent: 6566810 (2003-05-01), Seibold et al.
patent: 6734631 (2004-05-01), Juestel et al.

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