超声辅助合成CePO_4:Tb/LaPO_4核壳荧光粉发光性质的研究

Ultrasonic-assisted Synthesis CePO_4:Tb/LaPO_4 Core-shell Phosphor and Their Photoluminescence Properties

用超声辅助合成CePO_4:Tb/LaPO_4核/壳荧光粉,采用XRD、SEM及PL方法对样品进行了表征。结果显示:属于含结晶水的正磷酸盐六方晶系纳米棒状结构,并优先选择102和200晶面生长。在发射光谱中,呈现Tb^(3+)的特征发射峰5D4–7FJ(J={6,5,4,3}),在激发光谱中主要吸收的能量来自Ce^(3+),综合进一步说明了Ce^(3+)离子可以很好的敏化发光;CePO_4:Tb/LaPO_4核/壳结构的形成大大提高了其荧光强度,原因在于:La PO4与CePO_4同晶型,La PO4可以较好的起到屏蔽效应,且能量通过Ce^(3+)→La^(3+)→Tb^(3+)的能量传递。这一实验结果为研究高效的荧光材料提供了理论指导。

CePO4:Tb/LaPO4 core/shell phosphor was synthesized by ultrasonic and characterised by XRD, TEM,SEM, PL to analyze their formation mechanism, and the further study of relationship morphology, structure and photoluminescence properties. The results showed that the samples are hexagonal nano-bar structure orthophosphate containing crystal water. The [102] and [200] of crystals has priority to grow. At the emission spectrum, the samples show Tb3+characteristic emission, i.e 5 D4–7 FJ(J={6,5,4,3}),The most energy comes from Ce3+ ions at the excitation spectrum, which further proves that the Ce3+ ions can sensitize luminescence well. It is revealing the more intense emission of the CePO4:Tb/LaPO4 core-shell phosphor than CePO4:Tb phosphor, One reason is that La PO4 and CePO4 are the same crystal type, the anthers is that LaPO4 has shielding effect, and the energy is transmitted by the way of Ce3+→La3+→Tb3+.The results are useful developing effective phosphor.