Terbium-activated rare earth oxysulfide phosphor with enhanced blue emission
AssigneeOsram Sylvania Inc.
InventorRamon L. Yale
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Abstract
A terbium-activated rare earth oxysulfide phosphor with an enhanced blue emission is disclosed. The phosphor includes a rare earth oxysulfide matrix of the nominal formula M.sub.2-x O.sub.2 S:xTb, where M is lanthanum, gadolinium, yttrium, scandium, lutetium, or mixtures of these metals, and x is 0.001-0.2. Copper is incorporated in the matrix to enhance the blue emission of the phosphor. A method of enhancing the blue emission is also disclosed.
Claims13
A terbium-activated rare earth oxysulfide phosphor with an enhanced blue emission, said phosphor comprising:
- a rare earth oxysulfide matrix of the nominal formula:
- M.sub.2-x O.sub.2 S:xTb
- wherein M is at least one rare earth element selected from the group consisting of lanthanum, gadolinium, yttrium, scandium, and lutetium, and x is 0.001-0.2;
- and
- an amount of copper sufficient to enhance the blue emission of the phosphor incorporated in said matrix.
A method of enhancing the blue emission of a terbium-activated rare earth oxysulfide phosphor comprising a rare earth oxysulfide matrix of the formula:
- M.sub.2-x O.sub.2 S:xTb
- wherein M is at least one rare earth element selected from the group consisting of lanthanum, gadolinium, yttrium, scandium, and lutetium, and x is 0.001-0.2, said method comprising:
- incorporating an amount of copper sufficient to enhance the blue emission of the phosphor into said matrix.
Dependencies are inferred from the claim text.