Coated fluorescent substance, light emitting device comprising said substance and a method for producing said substance
AssigneesOSRAM GmbH, OSRAM Opto Semiconductors GmbH
InventorsBert Braune, Torsten Fries, Rainer Schirmer, Martin Zachau, Franz Zwaschka
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Abstract
A coated phosphor, formed by a powder of individual grains of a phosphor as base material, the grains being coated with a coating material. The layer comprises a plurality of individual layers and is particulate in form, the individual primary particles of the layer being at least 5 nm in size. The mean layer thickness is at least 20 nm.
Claims14
A coated phosphor comprising a powder of individual grains of a phosphor as base material, the grains being coated with a coating material, wherein the layer comprises a plurality of individual layers and is particulate in form, the individual primary particles of the layer being at least 5 nm in size, and the mean layer thickness being at least 20 nm.
A process for producing a coated phosphor, comprising the steps of:
- a) providing a phosphor powder as base material;
- b) providing a metal oxide produced by flame hydrolysis as coating material;
- and
- c) dry-mixing the two materials.
Dependencies are inferred from the claim text.