Device for converting invisible and visible radiation to visible light and/or UV radiation
AssigneeEastman Kodak Company
InventorsGustavo R. Paz-Pujalt, James M. Chwalek, Anna L. Hrycin, Dilip K. Chatterjee, Liang-Sun Hung
Life of this patent
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Abstract
An amorphous upconversion phosphor comprising barium fluoride a combination of rare-earth fluorides including yttrium and lanthanum and dopants, and a waveguide thereof on a substrate selected to have a refractive index lower than a thin film of the phosphor material or any other substrate with an appropriate buffer layer of lower refractive index that the film wherein infrared radiation is converted into visible or visible and ultra violet light. The amorphous upconversion phosphor is deposited at temperatures low enough to permit integration into semiconductor materials.
Claims20
A process for converting infrared light to visible light for use in recording and printing information on a photographic media comprising:
- (a) providing a substrate;
- (b) depositing on the substrate a thin amorphous glassy phosphor film including an alkaline earth fluoride and a mixture of rare-earth fluorides on the substrate which film has an index of refraction greater than the substrate and converts infrared radiation into visible or ultraviolet and visible radiation;
- (c) illuminating the thin amorphous glassy phosphor film with infrared light which is converted to visible light;
- and
- (d) recording on photographic media.
A process for converting infrared light to visible light for use in recording and printing information on photographic media comprising:
- (a) providing a substrate;
- (b) depositing on the substrate a buffer layer;
- (c) depositing on the buffer layer a thin amorphous glassy phosphor film including an alkaline earth fluoride and a mixture of rare-earth fluorides, which film has an index of refraction greater than the buffer layer and converts infrared radiation into visible or ultraviolet and visible radiation;
- (d) illuminating the thin amorphous glassy phosphor film with infrared light which is converted to visible light;
- and
- (e) recording on photographic media.
Dependencies are inferred from the claim text.