【摘要】 通过共沉淀法制备了掺镨（Pr）的纯相CaTiO₃∶Pr纳米荧光粉。采用差热和热重分析（DSC/TG）,X射线衍射仪（XRD）,荧光光谱仪（PL）研究了前驱体和荧光粉的热动力学行为,晶体结构和光学性能。讨论了前驱体在煅烧过程中所经历的化学反应,研究了pH值和掺杂浓度对CaTiO₃结构和性能的影响。结果表明,升高pH值可以明显减少晶体内部缺陷,却不改变晶粒尺寸;当pH值和Pr³⁺离子掺杂浓度分别为8.5和0.1%（原子分数）时,荧光粉的发光性能最好。光谱分析结果表明,Pr³⁺离子间的电偶极作用是产生浓度淬灭效应的主要原因。更多还原

【Abstract】 Pure praseodymium doped calcium titanate nanophosphors with average grain size of 56 nm was synthesized by coprecipitation and followed by sintering at 900 ℃. Thermodynamic behavior, crystal structure and optical properties of precursors and CaTiO₃∶Pr nanophosphors were studied by DSC/TG, XRD and PL, respectively. Specific reaction processes during calcination of precursors, and effect of pH and Pr³⁺ doping concentration on structure and properties of CaTiO₃∶Pr powders were examined and discussed in detail. Experimental results showed that grain size of CaTiO₃∶Pr nanophosphors was consistent regardless of pH（5.5-8.5）, but increasing pH was beneficial to luminescent performance due to decrease of microstrain inside grain. Optimal Pr³⁺ doping concentration was determined to be 0.1 at%. The results of spectral analysis showed that electric dipole action was dominant cause of concentration quenching effect.更多还原