| http://www.w3.org/ns/prov#value | - A process for the preparation of a phosphor represented by the following general formula: M3-x Tbx BO6 wherein M stands for at least one element selected from the group consisting of La, Gd and Y, and x is a number of 0.1???x???0.8,which comprises heating an oxide of at least one rare earth element selected from the group consisting of La, Gd and Y or a rare earth metal compound capable of being c
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