Illuminant and illuminant lamp comprising said illuminant
AssigneeLedvance GmbH
InventorsRenate Hirrle, Armin Konrad, Robert Otto, Joerg Strauss
Life of this patent
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Abstract
A phosphor for low-pressure discharge lamps is disclosed, wherein the phosphor is present in the form of phosphor grains coated with a protective layer, wherein the protective layer consists of a metal oxide, a metal borate, a metal phosphate or mixtures thereof.
Claims14
A phosphor for low-pressure discharge lamps,
- wherein the phosphor is present in the form of phosphor grains coated with a protective layer, wherein the protective layer consists of a metal borate, a metal phosphate or mixtures thereof;
- wherein the metal borate or metal phosphate is a binary metal borate or metal phosphate of the formula MePO4 or MeBO3, wherein Me is selected from Sc, Y, La, Gd, and Lu;
- or
- the metal borate or metal phosphate is a ternary metal borate or metal phosphate of the formula or (Me11-xMe2x)PO4 or (Me11-xMe2x)BO3, wherein Me1 and Me2 are selected independently of one another from Sc, Y, La, Gd, and Lu;
- wherein the phosphor comprises rare earth compounds in an amount less than about 0.1% by weight.
A composition of phosphors for low-pressure discharge lamps, wherein the composition of phosphors comprises at least one halophosphate phosphor comprising rare earth compounds in an amount less than about 0.1% by weight, wherein the at least one halophosphate phosphor is present in the form of phosphor grains coated with a protective layer, wherein the protective layer consists of a metal borate, a metal phosphate or mixtures thereof;
- wherein the metal borate or metal phosphate is a binary metal borate or metal phosphate of the formula MePO4 or MeBO3, wherein Me is selected from Sc, Y, La, Gd, and Lu;
- or
- the metal borate or metal phosphate is a ternary metal borate or metal phosphate of the formula or (Me11-xMe2x)PO4 or (Me11-xMe2x)BO3, wherein Me1 and Me2 are selected independently of one another from Sc, Y, La, Gd, and Lu.
A low-pressure discharge lamp comprising a discharge vessel filled with a filling gas composition, and comprising a multilayered phosphor coating comprising a phosphor layer facing the inner side of the discharge vessel and a phosphor layer facing the discharge space,
- wherein the phosphor layer facing the inner side of the discharge vessel and/or the phosphor layer facing the discharge space contains a composition, wherein the composition within the phosphor layer facing the inner side comprises at least one halophosphate phosphor,
- wherein the at least one halophosphate phosphor is present in the form of phosphor grains coated with a protective layer, wherein the protective layer consists of a metal borate, a metal phosphate or mixtures thereof;
- wherein the metal borate or metal phosphate is a binary metal borate or metal phosphate of the formula MePO4 or MeBO3, wherein Me is selected from Sc, Y, La, Gd, and Lu;
- or
- the metal borate or metal phosphate is a ternary metal borate or metal phosphate of the formula (Me11-xMe2x)PO4 or (Me11-xMe2x)BO3, wherein Me1 and Me2 are selected independently of one another from Sc, Y, La, Gd, and Lu.
Dependencies are inferred from the claim text.