Na Jia, Li Youmo. THE LUMINESCNECE AND ENERGY TRANSFER OF Ce<sup>3+</sup>, Tb<sup>3+</sup> AND Eu<sup>3+</sup> IN HEXAGONAL-Na<i>Ln</i>F<sub>4</sub> (<i>Ln</i>=La, Gd or Y)[J]. Chinese Journal of Luminescence, 1987,8(1): 18-24
Na Jia, Li Youmo. THE LUMINESCNECE AND ENERGY TRANSFER OF Ce<sup>3+</sup>, Tb<sup>3+</sup> AND Eu<sup>3+</sup> IN HEXAGONAL-Na<i>Ln</i>F<sub>4</sub> (<i>Ln</i>=La, Gd or Y)[J]. Chinese Journal of Luminescence, 1987,8(1): 18-24DOI: