摘要：目前，固体发光材料已经引起了研究人员的眷注，种类有许多。根据元素构成可分为有机与无机，而无机发光材料物理性质和化学性质相对于有机都更加稳定，因此固体无机发光材料的研究尤为重要。钼酸盐基质作为一种具有出色的物理和化学特性的固体无机发光材料，能够由许多完全不一样的方法合成，操作可选性大，并且原物质再掺杂稀土离子后拥有特别卓越的发光性能。掺杂的稀土离子不同，可以获得多色发光和白光发光，利用XRD、SEM和荧光光谱仪对其结构、形貌和发光性能进行研究。主要研究内容如下：72212

本论文选取CaLa2(MoO4)4 基质为研究对象，利用EDTA作为表面活性剂，采用水热法制备Eu3+、Sm3+、Dy3+单掺杂和Eu3+，Tb3+；Eu3+，Dy3+共掺杂的多钼酸盐发光材料。对合成样品的结构、形貌和发光性能进行了研究。如今取得了如下研究结果：

 通过改变EDTA的量、La-Mo比例及反应时间能够人为的调整CaLa2(MoO4)4的形貌，根据SEM检测得到的形貌图来选择合成最佳形貌（哑铃型）的条件为EDTA=0。20g、La：Mo=1:3、反应时间为20h。

 单掺杂Eu3+、Sm3+、Dy3+并不改变样品形貌。掺杂Eu3+时，显示出明亮的红光5D0→7F2 (616 nm)，未曾出现浓度猝灭现象，发射强度随着Eu3+浓度的增加而增强，Eu3+=0。5mmol时达到最大。Sm3+的最佳掺杂量为0。15mmol，在646nm处有强烈4G5/2→6H9/2跃迁（红光）。Dy3+的最佳掺杂量为0。5mmol，产生574nm（黄光）处的4F9/2→6H13/2跃迁。

 Eu3+，Dy3+共掺杂呈现出强烈红光→橙红→黄光的色光变化，最终在掺杂Dy3+的量为0。5mmol时，获得白色荧光粉。共掺杂Eu3+，Tb3+，显示Tb3+在545nm（5D4→7F5）的绿光和Eu3+在616 nm (5D0→7F2)的红光。

毕业论文关键词： 固体发光材料；钼酸盐基质；稀土离子掺杂；可控形貌；光致发光

Preparation and Properties of CaLa2 (MoO4)4 Luminescent Materials

Abstract：At present, solid luminescent materials have attracted much attention from researchers and it has many kinds, according to the composition of elements can be pided into organic luminescent materials and inorganic luminescent materials, and the physical and chemical properties of inorganic luminescent materials are more stable than organic ones。 Therefore, the research of solid inorganic luminescent materials is very important。 As a member of the solid inorganic luminescent material, the molybdate matrix has good physical and chemical properties, and its synthesis method is large, so the selectivity is large, and it has excellent luminescence properties after doping rare earth ions。 Doped different rare earth ions, can be multi-color luminescence and white light emission。 The structure and luminescence properties of the films were investigated by XRD, SEM and Fluorescence spectroscopy。 The main research contents are as follows:

In this paper, the research object was CaLa2 (MoO4)4。 Eu3+, Sm3+, Dy3+ single doped and( Eu3+, Tb3+) ,(Eu3+, Dy3+) co-doped molybdate used EDTA as surfactant prepared by hydrothermal method。 Synthesized samples’ structure and luminescence properties were studied。 Now the following research results have been achieved:

 The morphology of CaLa2 (MoO4)4 can be adjusted by changing the amount of EDTA, La-Mo ratio and reaction time。 The optimal morphology (dumbbell type) is EDTA = 0。20 G, La: Mo = 1: 3, and the reaction time was 20 h。

 Single doped Eu3+, Sm3+, Dy3+ did not change the morphology of the samples。 When the Eu3+ is doped, the bright red light 5D0→7F2 (616 nm) is shown, as the concentration of Eu3+ increases, the luminous intensity increases。 When Eu3+=0。5mmol, it has the best glowing。 0。15mmol is the best doping amount of Sm3+, and there is a strong 4G5/2→6H9/2 transition (red light) at 646nm。 The optimum doping amount of Dy3+ is 0。5mmol, resulting in a 4F9/2→6H13/2 transition at 574 nm (yellow)。