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1.5microns Infrared Excitation of Visible Luminescence in Y sub (1-x) Er sub (x) F sub 3 and Y sub (1-x-y) Er sub (x) TiMyF sub 3 via Resonant Energy Transfer

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Intense visible emission in the red, green and blue has been observed by infrared to visible multi-photon Y sub (1-x) Er sub (x) F sub 3 upconversion phosphors pumped with 1.5microns radiation from InGaAsP laser sources. With 0.01