Si,Lu掺杂Ca0.8Zn0.2TiO3:Pr3+荧光粉的光学性能改善

采用高温固相法合成Ca_0.8Zn_0.2TiO₃：0.2% Pr³⁺，Si⁴⁺和Ca_0.8Zn_0.2TiO₃：0.2% Pr³⁺，Si⁴⁺，Lu³⁺荧光粉。通过X射线衍射仪、电子顺磁共振光谱仪、显微拉曼光谱仪和荧光光谱仪等表征了该系列荧光粉的物相组成、微观结构和发光性质。结果表明，以β-Si₃N₄为硅源制备的荧光粉具有最佳的光学性能。加入ZnO后，荧光粉由CaTiO₃、Zn₂TiO₄和Ca₂Zn₄Ti₁₆O₃₈三相组成，其中CaTiO₃为主相。电子顺磁共振谱证实了Pr⁴⁺存在，Lu³⁺的添加使Pr⁴⁺Ti³⁺O₃]⁺簇显著增加，电子顺磁共振谱和拉曼光谱均证实Si⁴⁺、Lu³⁺的掺杂使局部TiO₆簇对称性提高，有利于Pr³⁺发光中心的能量传递。在336 nm激发下，荧光粉展示了很强的位于612 nm的红光发射（归属于Pr³⁺的¹D₂→³H₄跃迁）及理想的红光色坐标（x=0.670，y=0.330）。Si⁴⁺和Lu³⁺的添加显著增强了370 nm激发下红光发射，Ca_0.8Zn_0.2TiO₃：0.2% Pr³⁺，3.2% Si⁴⁺荧光粉的余辉寿命最长。

Improved Luminescence Properties of Ca0.8Zn0.2TiO3:Pr3+ Phosphors Doped with Si and Lu

Ca_0.8Zn_0.2TiO₃:0.2%Pr³⁺,Si⁴⁺ and Ca_0.8Zn_0.2TiO₃:0.2%Pr³⁺,Si⁴⁺,Lu³⁺ phosphors were synthesized by high temperature solid-state method. Crystalline phase, microstructure and luminescence properties of phosphors were characterized with X-ray diffractometer (XRD), electron paramagnetic resonance spectrometer (EPR), microscopic Raman spectrometer and photoluminescence spectrometer, respectively. The results show that phosphor prepared using β-Si₃N₄ as Si source has the optimal luminescence properties. Phosphors with the addition of ZnO were confirmed to be constituted of CaTiO₃, Zn₂TiO₄ and Ca₂Zn₄Ti₁₆O₃₈, and CaTiO₃ is major phase. EPR spectra confirm that the presence of Pr⁴⁺ andPr⁴⁺Ti³⁺O₃]⁺ clusters remarkably increase with the Lu³⁺ addition. Increasing local symmetry of TiO₆ clusters with the addition of Si⁴⁺ and Lu³⁺ is verified by EPR and Raman spectra, which is beneficial for the energy transfer of luminescent center Pr³⁺. The obtained phosphor exhibited the intense red emission centered at 612 nm (originated from ¹D₂→³H₄ transition of Pr³⁺) with an ideal chromaticity coordinate located at (x=0.670, y=0.330) under 336 nm excitation. Red emission excited by 370 nm remarkably increases with the addition of Si⁴⁺ and Lu³⁺. The synthetic Ca_0.8Zn_0.2TiO₃:0.2%Pr³⁺,3.2%Si⁴⁺ phosphor has the longest average lifetime.