机构地区: 中山大学化学与化学工程学院高分子研究所
出 处: 《中国稀土学报》 2005年第4期509-512,共4页
摘 要: 溶胶-凝胶法制备了掺稀土Eu3+的TiO2-SiO2杂化体系,发现随着Ti/Si摩尔比的增加,Eu3+特征发射峰的强度增强,荧光寿命延长,表明TiO2的加入能够有效降低Eu3+的团聚;同时,Eu3+发射光谱中5D0→7F2与5D0→7F1的荧光强度比值R也随着TiO2浓度的增加而增大,显示了Eu3+-O2--Ti4+键的形成。研究了Eu3+掺杂浓度的改变对Eu3+荧光强度和R值的影响。 TiO_2-SiO_2 hybrid materials containing Eu^(3+) ions were prepared via sol-gel method. Upon the introduction of TiO_2, the emission intensity and the average decay time increase, revealing that the incorporation of TiO_2 can reduce the extent of the Eu^(3+) clusters. At the same time, the intensity ratio of ()~5D_0→~7F_2 to (()~5D_0→~7F_1) increases as the TiO_2 concentration increases, indicating the formation of Eu^(3+)-O^(2-)-Ti^(4+) bonding. Moreover, the influence of the ion Eu^(3+) concentration on th...