The photoluminescence spectra of K2GdF5:Tb3 + (0. 5% , mole fraction) single crystal under various excitations were measured and compared. The room temperature excitation spectra of 5D3→7F6 and 5D4→7F5 transitions exhibited three broad bands and three groups of narrow peaks. The narrow peaks were assigned as 8S7/2→6FJGJ, 8S7/2→6DJ and 8S7/2→6IJ transition of Gd3+ and the broad bands were assigned as the absorption from the ground state 7F6 to the low-spin states of 4f7(8S)5d configurations of Tb3+. The mechanism of energy transfer from Gd3 + to Tb3 + and the cross relaxation between Tb3 + ions were also analyzed.%对比了不同激发波长下水热法合成的K2GdF5:Tb3+(摩尔分数0.5％)单晶材料的光致发光谱线；监测了5 D3→7F6和5 D4→7 F5的激发谱,给出了几组窄带吸收和3个宽带吸收；分析表明窄带发射为Gd3+的8 S7/2→6FJ、8S7/2→6GJ、8S7/2→6DJ、8S7/2→6IJ的跃迁,宽带发射为Gd3+的基态7F6到4f7(8S) 5d组态中的低自旋态的跃迁；此外,还对Gd3+→Tb3+的能量传递和Tb3之间的交叉弛豫进行了初步分析.
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