Abstract

Solutions of (Zn, Pb, Mn)S quantum dots with different molar ratios between cations are produced by colloidal synthesis in a methyl methacrylate (MMA) medium. By the thermal polymerization of MMA in a block, the colloidal solutions are converted into the vitreous state. The optical transparency of the poly(MMA)/(Zn, Pb, Mn)S composites at the wavelengths >500 nm reaches 90% at a thickness of the absorbing layer up to 5 mm. The photoluminescence of the composites in the spectral range 400–480 nm is defined by the recombination of electrons at the levels of defects of the ZnS crystal structure, and photoluminescence in the range 520–620 nm by the ⁴T₁ → ⁶A₁ electronic transition in Mn²⁺ ions. Photoluminescence excitation is a result of interband transitions in ZnS, with energy transfer from the conduction band of ZnS to the levels of Mn²⁺ ions. The luminescence spectrum depends on the molar ratio between Mn²⁺ and Pb²⁺ ions, the order of introduction of substances into the reaction mixture, and the excitation-radiation wavelength.

中文翻译：

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聚丙烯酸酯基体中（Zn，Pb，Mn）S量子点的光致发光

摘要

通过在甲基丙烯酸甲酯（MMA）介质中进行胶体合成来生产阳离子之间具有不同摩尔比的（Zn，Pb，Mn）S量子点溶液。通过MMA的嵌段热聚合，胶体溶液转化为玻璃态。聚（MMA）/（Zn，Pb，Mn）S复合材料在大于500 nm的波长下的光学透明性在吸收层的厚度达到5 mm时达到90％。复合材料在400–480 nm光谱范围内的光致发光由ZnS晶体结构缺陷水平上的电子复合以及⁴ T ₁ → ⁶ A ₁电子在520–620 nm范围内的光致发光定义。Mn ^2+中的转变离子。光致发光激发是ZnS的带间跃迁的结果，能量从ZnS的导带转移到Mn ²⁺离子的能级。发光光谱取决于Mn ²⁺和Pb ²⁺离子之间的摩尔比，将物质引入反应混合物的顺序以及激发辐射波长。