Alkaline earth aluminate phosphor, phosphor paste...

Details Alkaline earth aluminate phosphor, phosphor paste... Alkaline earth aluminate phosphor, phosphor paste...

2007-10-16

2007-10-16

Guharay, Karabi (Department: 2879)

Electric lamp and discharge devices

With luminescent solid or liquid material

With gaseous discharge medium

C252S30140R, C252S30160R

Reexamination Certificate

active

10485260

ABSTRACT:
A phosphor improved against luminance deterioration with time under vacuum ultraviolet irradiation, a phosphor paste composition, and a vacuum ultraviolet excitation light emitting element high in luminance retaining rate and improved in luminance, are presented. An alkaline earth aluminate phosphor which is a phosphor represented by the formula a (M1-xEux)O.6Al2O3(wherein M represents at least one alkaline earth metal element selected from the group consisting of Ba, Sr and Ca, and x and a satisfy 0<x<1 and O.9≦a≦1.8, respectively) and which has a wide-band peak over an angle region of diffraction angle (2θ) of from 28° to 31° in powder diffraction X-ray spectrum by CuKα1 characteristics X-ray, and a vacuum ultraviolet excitation light emitting element provided with a fluorescent layer made of the phosphor.

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