By adding a rare earth or the like having a fluorescent emission characteristics and its manufacturi

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PROBLEM TO BE SOLVED : To provide a phosphor which is chemically stable, excels in heat resistance and resistance to radiation properties, can stably emit fluorescence even in a severe environment and in extreme conditions. ŽSOLUTION : A cBN or hBN crystal which exhibits the inherent fluorescence properties of an activator is synthesized by adding an activator containing at least one activating ion selected from a trivalent europium ion, a trivalent terbium ion, a trivalent samarium ion, a trivalent cerium ion, and a divalent manganese ion to a solvent for synthesizing a BN crystal by the high-pressure solvent method and subjecting the crystal raw material to a high-temperature high-pressure treatment in this solvent to form the cBN or hBN crystal uniformly activated by the activating ion. ŽCOPYRIGHT : (C)2007, JPO&INPIT Ž