Electric lamp and discharge devices – With luminescent solid or liquid material – Solid-state type
Reexamination Certificate
2006-01-03
2006-01-03
Patel, Nimeshkumar D. (Department: 2879)
Electric lamp and discharge devices
With luminescent solid or liquid material
Solid-state type
C313S498000, C313S499000, C313S501000, C313S502000, C313S512000, C257S089000, C257S090000, C257S098000, C257S100000, C252S30140R, C252S30140P, C252S301500
Reexamination Certificate
active
06982523
ABSTRACT:
As a red light emitting phosphor capable of efficiently emitting red light at a high luminance in response to exciting light having a wavelength of 350-420 nm, and practically used in a light emitting device for red display or a light emitting device for white or intermediate color display in combination with green and blue light emitting phosphors, the invention provides a red light emitting phosphor capable of emitting red light upon excitation with light having a wavelength of 350-420 nm and having compositional formula (1):in-line-formulae description="In-line Formulae" end="lead"?AEuxLn(1-x)M2O8 (1)in-line-formulae description="In-line Formulae" end="tail"?wherein A is at least one element selected from among Li, Na, K, Rb and Cs, Ln is at least one element selected from among Y and rare earth elements exclusive of Eu, M is at least one element selected from among W and Mo, and x is a positive number satisfying 0<x≦1; and a red light emitting phosphor having compositional formula (2):in-line-formulae description="In-line Formulae" end="lead"?D0.5EuyLn(1-y)M2O8 (2)in-line-formulae description="In-line Formulae" end="tail"?wherein D is at least one element selected from among Mg, Ca, Sr and Ba, Ln is at least one element selected from among Y and rare earth elements exclusive of Eu, M is at least one element selected from among W and Mo, and y is a positive number satisfying 0<y≦1. Methods for preparing the red light emitting phosphors, and light emitting devices using the red light emitting phosphors are also provided.
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Hodges Matt
Kabushiki Kaisha Fine Rubber Kenkyuusho
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Patel Nimeshkumar D.
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