基于介孔纳米粒子模板合成兼有荧光和近红外发光的稀土核-壳结构纳米材料

Luminescence and Near-infrared Emission of Rare Earth Core-shell Nanomaterials Synthesized via Mesoporous Silica Nanoparticles as Template

利用单分散性良好的介孔SiO2纳米粒子为模板,选择Y2O3为基底,同时掺杂可见区红光发光中心Eu3+和近红外区发光中心Er3+(1.54μm),制备了特殊结构的核壳多功能发光纳米材料.光谱测试结果表明,这种核壳材料同时具有可见区发光和近红外发光的双重性质,表明Y2O3可作为红光Eu和近红外发光Er的良好基底材料.该方法可以大大降低纳米发光材料中稀土元素的使用量,降低发光材料的成本,并且该核壳结构材料密度相对较低,易于分散在有机溶剂或者水中,在药物释放和多功能生物标记等方面具有潜在的应用价值.

We have utilized a homogeneous precipitation method to fabricate core-shell Y2O3∶Er,Eu nanomaterials with colloidal mesoporous silica nanoparticles as templates followed by heat treatment at 800 ℃,and the luminescence properties of the as-synthesized nanomaterials have been investigated in detail.The core-shell nanoparticles exhibit properties of photoluminescence and near-infrared（NIR） luminescence.And Y2O3 is a promising host matrix for downconversion and NIR luminescence due to its good chemical,thermal stabilities and low phonon energy.The core-shell nanoparticles may have some advantages for potential applications in drug delivery or optical imaging.