以Eu(NO3)3·6H2O为铕源,采用溶胶-凝胶法制备了TiO2∶Eu3+荧光粉,研究了Eu3+离子掺杂量对TiO2基质物相、发光性能的影响,进一步探讨了TiO2基质与Eu3+离子的能量传递机理,利用X射线衍射(XRD)、荧光光谱、荧光寿命衰减曲线进行表征。结果表明:样品为锐钛矿结构,在395nm、465nm波长激发下,发射主峰在615nm处,与Eu3+的5D0→7F2电偶极跃迁相对应,可用于红光荧光粉。TiO2基质到Eu3+离子的能量传递可通过氧空位缺陷作为能量捕获中心实现能量转移,增强Eu3+离子的发光。所制备的TiO2∶Eu3+荧光粉可用于硅太阳能电池。
TiO2∶Eu3+ phosphors were prepared by sol-gel method with Eu(NO3)3·6H2O as the source.The effect of Eu3+ ion doping amount on the phase and luminescence properties of TiO2 matrix was studied.The TiO2 matrix was further discussed.The energy transfer mechanism of Eu3+ ions was characterized by X-ray diffraction (XRD),fluorescence spectra,and fluorescence lifetime decay curves.The results shown that the sample was anatase.Under the excitation of 395nm and 465nm,the main emission peak was at 615nm,which corresponded to the 5D0→7F2 electric dipole transition of Eu3+,which can be used for red phosphor.The energy transfer from the TiO2 matrix to the Eu3+ ions can achieve energy transfer through oxygen vacancy defects as an energy capture center,enhancing the luminescence of Eu3+ ions.The prepared TiO2∶Eu3+ phosphor can be used for a silicon solar cell.
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