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US 5,492,776 AGranted
Highly oriented metal fluoride thin film waveguide articles on a substrate
AssigneeEastman Kodak Company
InventorsGustavo R. Paz-Pujalt, Liang-Sun Hung, James M. Chwalek, Anna L. Hrycin, Dilip K. Chatterjee, Duncan A. Richards
Life of this patent
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Abstract
A highly oriented thin film of specific barium fluoride materials deposited at low temperatures are useful as Upconversion waveguides.
Claims4
An article which can be used as an Upconversion waveguide comprising:
- a substrate and a thin highly oriented crystalline film comprising an alkaline earth fluoride and at least one mixture of rare earth fluorides on the substrate selected so that the article is capable of converting IR radiation and visible light into visible RGB-UV radiation and which have the formula
- BaLn.sub.2 F.sub.8 I.
- or
- Ba.sub.1-x Ln.sub.x F.sub.2+x II.
- wherein
- Ln is a combination of at least two selected from the group consisting of Y, Yb, Ho, Er, Tm and Pr and x is in a sufficient amount up to 0.27 to cause Upconversion.
3 more elements
Dependencies are inferred from the claim text.