| 摘要 |
PURPOSE: To obtain a crystal phosphor thin film of a low-loss highly oriented up-conversion phosphor, by using a thin film of a specified barium fluoride material deposited at a low temperature which is higher oriented, as an up- conversion waveguide. CONSTITUTION: On a substrate 10, a phosphor thin film 12 having a greater refractive index than the substrate 10 and highly oriented is provided. The phosphor thin film 12 is deposited on the substrate 10 from corresponding fluoride by electron evaporation or heat evaporation. The phosphor thin film 12 is selected from BaLn2 F8 and Ba1-x Lnx F2-x . In this case, Ln is Y, Yb, Ho, Er, Tm, Py, or combination thereof, and (x) has a range up to 27. The phosphor thin film on the substrate becomes a waveguide. When optically coupled with a pump source for radiation in an IR region, the up-conversion phosphor thin film waveguide converts this radiation into visible rays or UV radiation. |
