METHODS OF USING RARE-EARTH OXIDE COMPOSITIONS AND RELATED SYSTEMS

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A method for communicating between a surface containing a rare-earth oxide phosphor, which emits a second wavelength photon when excited by a first wavelength photon, and an article mounted on a device, wherein the method includes exciting the phosphor with a source that emits a first wavelength photon to produce a second wavelength photon response in the surface; and detecting the second wavelength photon with a means in communication with the article, wherein the article is capable of emitting a signal based upon receipt of the second wavelength photon.