The ~5D_1 emission of Eu~(3+) in the La_(1-x)Eu_xF_3 nanoparticles can be observed at room temperature when doping concentration of Eu~(3+) ions is lower than 30 mol%.

• Eu~(3+)掺杂LaF_3纳米晶体的激发光谱和发射光谱表明,Eu~(3+)在晶体中处于C_2对称中心。