Luminescent material

Details Luminescent material Luminescent material

2007-07-18

2009-12-22

Koslow, C. Melissa (Department: 1793)

Compositions

Inorganic luminescent compositions

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

C313S503000, C257S098000

Reexamination Certificate

active

07635438

ABSTRACT:
A europium-activated alkaline earth orthosilicate luminescent material is provided, which includes a compound having a composition represented by a following formula 1:in-line-formulae description="In-line Formulae" end="lead"?(SrxBayCazEuw)2SiO4  formula 1in-line-formulae description="In-line Formulae" end="tail"?wherein, x, y, z and w satisfy following relational expressions 2, and 4 to 7, and are values satisfying the expression 3 when a, b, c and d are assumed to be 573, 467, 623 and 736, respectively:in-line-formulae description="In-line Formulae" end="lead"?x+y+z+w=1  expression 2in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?600≦ax+by+cz+dw  expression 3in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0≦x/(1−w)≦0.95  expression 4in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0≦y/(1−w)≦0.4  expression 5in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0<z/(1−w)≦0.95  expression 6in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.02≦w≦0.2  expression 7in-line-formulae description="In-line Formulae" end="tail"?the luminescent material shows an emission band having a peak wavelength of 600 nm or more when the luminescent material is excited by ultraviolet radiation having a wavelength of 254 nm.

REFERENCES:
patent: 2005/0199897 (2005-09-01), Setlur et al.
patent: 2007/0090381 (2007-04-01), Otsuka et al.
patent: 2008/0185956 (2008-08-01), Hiramatsu
patent: 2005-277441 (2005-10-01), None
Barry, Fluorescence of Eu2+-Activated Phases in Binary Alkaline Earth Orthosilicate Systems, Journal of Electrochemical Society, 1968, vol. 115, No. 11, pp. 1181-1184.

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