Up-conversion phosphors

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Problem to be Solved To provide a novel up-conversion phosphor excellent in light-emitting properties. Solution The up-conversion phosphor of the present invention is an up-conversion phosphor including, in a ZnMoO 4 -based matrix material thereof, Yb 3+ , at least one rare earth metal ion selected from the group consisting of Tm 3+ , Er 3+ and Ho 3+ , and at least one monovalent metal ion selected from the group consisting of Li + , K + , Na + and Rb + .