A phosphorescent substance near ultraviolet excitation

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Compounds which are excited in the near UV light are disclosed. These have the formula : X(YO4)3 wherein X represents a rare earth metal or more than one rare earth metal such that the total number of rare earth atoms represents a third of the number of YO4 ions and Y represents tungsten, molybdenum, niobium or tantalum and are obtained by reacting ions of X with YO4 ions in solution and recovering the resulting precipitate.