新型荧光粉Ca2Zn4Ti16O38：Pr^3＋Na^＋的合成和红色长余辉性质

Synthesis and Red Persistent Properties of Phosphor Ca_2Zn_4Ti_(16)O_(38):Pr～(3+),Na～+

采用溶胶-凝胶法合成了Ca2Zn4Ti16O38∶Pr3+,Na+荧光粉。通过X-射线衍射和荧光光谱表征样品的物相组成和发光性质。X射线衍射(XRD)分析表明添加适量的H3BO3作助熔剂有利于形成良好的Ca2Zn4Ti16O38晶体结构。荧光光谱表明Ca2Zn4Ti16O38∶Pr3+,Na+在可见光区(450～495nm)呈现Pr3+离子的4f→4f特征激发光谱以及613nm(1D2→3H4)和644nm(3P0→3F2)特征发射。Ca2Zn4Ti16O38∶Pr3+,Na+被可见光(475nm)激发产生的3P0→3F2(644nm)红色发射呈现出极慢的衰减特性。Ca2Zn4Ti16O38∶Pr3+,Na+是一种新型的可见光激发红色长余辉荧光粉。

Ca2Zn4Ti16O38：Pr^3＋Na^＋ red long decay phosphor was synthesized by sol-gel method. Crystallization and photoluminescence properties were investigated by using powder X-ray diffraction and by fluorescence spectrophotometer, respectively. XRD patterns show that the synthesized Ca2Zn4Ti16O3s crystalline powders possess the well structure when adding some H3BO3 as flux. Photoluminescence measurements indicate that the phosphors exhibit distinct excitation bands in visible region from 450-495 nm, which are originated from 4f→4ftransition, as well as red emitting of Pr^3＋ at 613 nm（^1D2→3H4）and 644 nm（3P0→^3F2）. Upon excitation with 475 nm, the red emission at 644 nm decays slower than ever before. Ca2Zn4Ti16O38：Pr^3＋Na^＋ is considered as a novel red long persistent phosphor candidate excitated by visible light.