稀土镨掺杂的CaTiO₃发光材料的制备与表征

【作者】 尚用甲；

【导师】 郑峰；

【作者基本信息】 中南大学 ， 材料物理与化学， 2008， 硕士

【摘要】 本文以CaTiO₃为基质,采用不同的原料和方法,制备了稀土元素镨掺杂的CaTiO₃:Pr³⁺发光材料。通过差热-热重、XRD、SEM、荧光光谱等研究手段对材料进行测试和表征,深入探讨了Pr³⁺在CaTiO₃基质中的发光机制,并考察了在不同实验条件和方法下对材料荧光性能的影响因素。以钛酸钙和硝酸镨为原料,采用高温固相法合成了稀土镨掺杂的钛酸钙发光材料。研究结果表明前躯体在1200℃的温度下煅烧时具有较好的发光性能。以乙醇为溶剂,采用溶胶-凝胶法合成了稀土镨掺杂的钛酸钙发光材料。经过表征分析发现干凝胶在900℃下煅烧时,产物形成了结晶较好的钙钛矿结构CaTiO₃,发光性能达到最优（发光强度最高且余晖最长）。以尿素为燃料,硼酸为助熔剂,采用燃烧法合成了稀土镨掺杂的钛酸钙发光材料。研究了尿素、硼酸的用量以及初始炉温对长余辉材料性能的影响。以草酸铵和氨水为沉淀剂,采用共沉淀法合成了稀土镨掺杂的钛酸钙发光材料。当煅烧温度为900℃,溶液的pH值为9时,所得产物的发光性能最佳。最后,对以上四种制备方法进行了综合的比较。只有把多种制备方法优化组合,才能制备出发光性能更加优良,余辉时间更加持久的发光材料。更多还原

【Abstract】 In this paper,adopted CaTiO₃ as the host,a kind of pr³⁺-doped phosphors was prepared used different starting materials and by different methods,and characterized by PL spectrum,XRD,SEM,DSC-Tg.The PL property and mechanism of pr³⁺-doped in the host were discussed.The influence to the PL intensity and morphology of experimental conditions and synthetic methods were also studied.Using CaCO₃ and Pr（NO₃）₃ as raw materials,CaTiO₃:Pr³⁺ have been synthesized via a solid-state reaction.Photoluminescence and decay curves show that the sample obtained at the sintering temperature of 1200℃exhibited the optimal luminous property.Phosphors CaTiO₃:Pr³⁺ have been synthesized by sol-gel method using ethanol as solvent.CaTiO₃:Pr³⁺ synthesized at the sintering temperature of 900℃exhibits the optimal luminous property.DSC-TG curves and X-ray diffraction analysis indicate that CaTiO₃:pr³⁺ has been synthesized at the sintering temperature of 900℃exhibited the optimal luminous property.Using urea as fuel and boric acid as flux material,red persistent phosphors CaTiO₃:Pr³⁺ have been successfully synthesized by combustion method.The photoluminescence,crystal and particle morphology of persistent phosphors were investigated.Using oxalate and ammonia as raw materials,CaTiO₃:Pr³⁺ have been synthesized via a co-precipitated reaction.Photoluminescence and decay curves show that the sample obtained at the sintering temperature of 900℃and at PH of 9 exhibited the optimal luminous property.At last,four methods are compared comprehensively.To optimize organization the four methods,CaTiO₃:Pr³⁺ could have stronger optimal luminous property.更多还原