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发明授权
CN101368098B YVO4:Eu3+/YPO4核壳结构纳米荧光粉及其制备方法 失效 - 权利终止

YVO4:Eu3+/YPO4核壳结构纳米荧光粉及其制备方法
摘要：
本发明公开了一种YVO4:Eu3+/YPO4核壳结构纳米荧光粉及其制备方法。该核壳结构荧光粉是通过在YVO4:Eu3+表面包覆YPO4实现的，YPO4与YVO4结构相同、晶格常数相近，可最大限度降低YVO4:Eu3+纳米发光颗粒的表面缺陷，使其发光效率比单纯的YVO4:Eu3+纳米粉提高5～30％。YVO4:Eu3+核心铕的摩尔浓度为1～8％，YVO4:Eu3+核心与YPO4外壳的摩尔比为1∶2～8∶1，该荧光粉的粒径为30～100纳米。本发明采用了两步水热法，先在150～250℃下水热合成YVO4:Eu3+纳米发光颗粒，再在水热条件下将YPO4包覆到纳米核心表面，得到该核壳结构纳米荧光粉。该制备方法生产工艺简单，操作方便，适合大规模产业化生产。
摘要（英）：

The invention discloses YVO4: Eu<3+>/YPO4 core-shell structure nano-phosphor powder and a preparation method thereof. The core-shell structure phosphor powder is achieved by coating YPO4 on the surface of YVO4: Eu<3+>. YPO4 is the same with YVO4 in structure with close lattice parameters. The surface defects of YVO4: Eu<3+> nano-luminescent granule can be minimized so that the luminous efficiency is improved by 5 to 30 percent compared with the luminous efficiency of pure YVO4: Eu<3+> nano-powder. The molarity of the core europium of YVO4: Eu<3+> is 1 to 8 percent. The mol ratio of the core of YVO4: Eu<3+> and the shell of YPO4 is 1:2-8:1. The particle size of the phosphor powder is 30 to 100 nanometers. The two-step hydrothermal method is adopted; YVO4: Eu<3+> nano-luminescent granule is hydrothermally synthesized in water at 250 DEG C. Subsequently, YPO4 is coated on the surface of the nano-core under hydrothermal conditions, thus getting the core/crust structure nano-phosphor powder. The preparation method of the invention has simple production process and convenient operation, which is applicable for large-scale industrialized production.

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