Ca9Y(PO4)7:Ce3+,Tb3+纳米荧光粉的制备及发光性能

采用水热法制备出Ca_9Y(PO4)7∶Ce~(3+),Tb~(3+)纳米荧光粉,通过XRD、SEM和荧光光谱等对样品进行了分析,研究在Ca_9Y(PO4)7基质中引入Ce~(3+),Tb~(3+)离子对发光性能的影响规律。研究发现因Tb~(3+)离子自身能量交叉驰豫的存在,使得单掺Tb~(3+)时,通过调节Tb~(3+)离子的浓度可以实现对发光颜色的控制。同时研究了Ce~(3+)-Tb~(3+)之间的能量传递为电多极相互作用的偶极-四极机制,Ce~(3+)-Tb~(3+)之间最大的能量传递效率为55.6%。Ca_9Y(PO4)7∶Ce~(3+),Tb~(3+)的发光颜色可以通过激活离子之间的能量传递和共发射得到可控调节。SEM分析表明荧光粉颗粒尺寸在100 nm左右,分散性好。

Preparation and Luminescent Properties of Ca9Y(PO4)7: Ce3+,Tb3+ Nano-phosphors

Ca₉Y(PO₄)₇:Ce³⁺,Tb³⁺ nano-phosphors were synthesized by hydrothermal method. X-ray diffraction (XRD), Scanning electron microscope (SEM) and Photoluminescence (PL) spectra and so on were used to characterize the samples. The effects of Ce³⁺ and Tb³⁺ on the luminescence properties of Ca₉Y(PO₄)₇:Ce³⁺,Tb³⁺ was studied in detail. The result indicates that the luminescence color of Ca₉Y(PO₄)₇:Tb³⁺ can be tuned through adjusting the concentration of Tb³⁺, which is attributed to the energy cross relaxation of Tb³⁺. And the energy transfer mechanism of Ce³⁺-Tb³⁺ was dipole-quadrupole mechanism of electric multipole interactional, the biggest energy transfer efficiency was 55.6%. The emission color of Ca₉Y(PO₄)₇:Ce³⁺,Tb³⁺ can be tuned by the energy transfer of ions and the total emission of activators. SEM showed that the samples had good dispersion, and the particle size of phosphors was about 100 nm.