Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Reexamination Certificate
2011-04-12
2011-04-12
Won, Bumsuk (Department: 2889)
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
C313S501000, C313S502000, C313S506000
Reexamination Certificate
active
07923918
ABSTRACT:
The present invention provides a reliable, long-life phosphor, or the like, which is prevented from darkening due to aging. A light emitting apparatus has a light emitting element and a phosphor layer. The phosphor layer has a phosphor excited by light from the light emitting element, and a binder which binds the phosphor. The binder is hydroxide oxide gel obtained by curing sol of a hydroxide oxide mixed with sol containing at least one metallic element selected from the group consisting of Al, Y, Gd, Lu, Sc, Ga, In, and B. Transmittance of hydroxide oxide in a gel state is higher than the transmittance in the polycrystal state where the sol-gel reaction is proceeded. In addition, the content of hydroxyl group or water of crystallization in the hydroxide oxide is 10% or less by weight.
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Izuno Kunihiro
Sofue Shinsuke
Takeichi Junji
Tamaki Hiroto
Nichia Corporation
Wenderoth , Lind & Ponack, L.L.P.
Won Bumsuk
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