【作者】 余方以；

【导师】 杨晴； 左健；

【作者基本信息】 中国科学技术大学 ， 凝聚态物理， 2011， 硕士

【摘要】 本论文旨在探索条件简易成本低廉的途径合成铕掺杂钼酸盐红色荧光粉。选择不同的碱源作为添加剂,通过低温水热反应得到不同形貌的微纳米掺杂目标产物。另外掺杂样品也通过Pechini反应制备得到,通过光学性质测试和分析,详细探讨其涉及的能量传递途径及可能存在的影响能量转移的有关因素。研究的主要内容如下:1.在无表面活性剂条件下选用不同的碱性溶剂作为碱源,通过简易的低温水热反应得到不同形貌的产物。实验考察了pH值、溶液浓度以及反应时间对于产物形貌的影响,探讨了产物的形成机理;不同形貌的实验产物表现出不同的发光性质,对其诱因做了相关的分析和研究。最终实验结果表明,用氨水作碱源120 oC条件下水热反应10 h得到的均匀饼形Eu³⁺掺杂CaMoO₄产物发光性能最优。2.通过Pechini方法得到分子水平上均匀的铕掺杂MMoO₄ （M = Ca, Sr）红色荧光粉。对比研究了铕掺不同基质材料产生的结构差异和关联;通过系列掺杂研究了能量传递和浓度淬灭效应;对于表现出的不同光学性质提出了可能的影响因素。实验表明,CaMoO₄:Eu³⁺ （7.5 mol%）表现出最优红色发光性质,将在荧光粉转换型白光LED领域有着潜在的应用。更多还原

【Abstract】 The aim of this dissertation is to explore the preparation of Eu³⁺-doped molybdates phosphors by facile and low-cost method. Selecting different alkaline sources as additive, different morphologies doping target products with uniform micro- and nano-structures were obtained by via the facile hydrothermal method at low temperature. In addition, the doping samples were also prepared by Pechini method. By photoluminescence measurements and analyses, we carefully investigate the pathway of energy transfer and relevant factors which may affect energy transfer. The main research contents are summarized as follow:1. Selecting different alkalis as alkaline sources in surfactant-free environment, products with different morphologies were obtained by facile hydrothermal method under low temperature. We investigated the influences of pH value, concentration and reaction time on shapes, and we studied the formation mechanism of the products; the experimental products with different morphologies showed different luminescent properties, so we have analyzed and researched the relevant inducement factors. Final results show that cake-like CaMoO₄:Eu³⁺ prepared by a facile hydrothermal method at 120 oC for 10 h using NH3·H2O as additive performs good photoluminescent properties.2. We obtained the Eu³⁺-doped MMoO₄ （M = Ca,Sr） with uniform composition at the molecular level. We comparably studied the discrepancy and relationship between structures produced by Eu³⁺ doped into different sustrates; we investigated the energy transfer and concentration quenching effect through a series of doping and proposed possible factors which may affect luminescent performance. The experiments showed that Eu³⁺-doped CaMoO₄ with doping concentration as 7.5 mol% would have potential applications in phosphor-converted white light-emitting diodes （LEDs）.更多还原