Surface-modified conversion phosphors
AssigneeMerck Patent GmbH
InventorsRalf Petry, Reinhold Rueger, Tim Vosgroene, Holger Winkler
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Abstract
The invention relates to surface-modified phosphor particles based on luminescent particles which comprise at least one luminescent compound, where (Ca,Sr,Ba)2SiO4 and other silicates having one or more activator ions, such as Eu, Ce and Mn, are excluded as luminescent compounds, and where at least one inorganic layer comprising oxides/hydroxides of Si, Al, Zr, Zn, Ti and/or mixtures thereof and an organic coating of organosilanes or polyorganosiloxanes (silicones) and/or mixtures thereof are applied to the luminescent particles, and to a production process.
Claims22
Surface-modified phosphor particles based on luminescent particles comprising:
- at least one luminescent compound selected from:
- (Y,Gd,Lu,Sc,Sm,Tb)3(Al,Ga)5O12:Ce with Pr;
- (Y,Gd,Lu,Sc,Sm,Tb)3(Al,Ga)5O12:Ce without Pr;
- YSiO2N:Ce;
- Y2Si3O3N4:Ce;
- Gd2Si3O3N4:Ce;
- BaMgAl10O17:Eu with Mn;
- BaMgAl10O17:Eu without Mn;
- Sr4Al14O25:Eu;
- (Ca,Sr,Ba)Si2N2O2:Eu;
- SrSiAl2O3N2:Eu;
- (Ca,Sr,Ba)2Si5N8:Eu;
- (Ca,Sr,Ba)SiN2:Eu;
- CaAlSiN3:Eu;
- molybdates;
- tungstates;
- vanadates;
- group III nitrides;
- and group III oxides, in each case individually or mixtures thereof with one or more activator ions,
- at least one inorganic layer comprising oxides/hydroxides of Si, Al, Zr, Zn, Ti and/or mixtures thereof, and
- an organic coating of organosilanes or polyorganosiloxanes and/or mixtures thereof are applied to the luminescent particles, wherein said at least one inorganic layer is between said at least one luminescent compound and said organic coating,
- wherein the amount of the organic coating is between 0.02 and 5% by weight based on the surface-coated phosphor particles.
Dependencies are inferred from the claim text.