For an up-conversion of single crystal fluoride bulk material

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PROBLEM TO BE SOLVED : To realize an up-conversion material having high luminous efficiency in a not extremely low temperature region (0°C or above) and having a uniform composition in the plane by a fluoride bulk single crystal. ŽSOLUTION : The fluoride bulk single crystal for up-conversion is expressed by MxYbyCa(1-x-y)F2+x+y. But the oxygen concentration in the crystal is not more than 1, 000 wt.ppm and further x is 0.0100COPYRIGHT : (C)2008, JPO&INPIT Ž