Enhanced fluorescence, morphological and thermal properties of CdSe/ZnS quantum dots incorporated in silicone resin.
Enhanced fluorescence, morphological and thermal properties of CdSe/ZnS quantum dots incorporated in silicone resin.
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DOI：
10.1166/jnn.2013.7081
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发表时间：
2013
影响因子：
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通讯作者：
Trung Nn;Luu Qp;Son Bt;H. Sinhle;Bae Jy
中科院分区：
文献类型：
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作者：
Trung Nn;Luu Qp;Son Bt;H. Sinhle;Bae Jy
我们的研究重点是硅树脂中掺入的核/壳硒化镉/硫化锌（CdSe/ZnS）量子点的形态和光学性质。将配体涂覆的量子点分散到道康宁双组分有机硅树脂(OE6630A和OE6630B，重量比为1:4)中后，在150℃下固化树脂1.5小时，得到量子点-有机硅树脂纳米复合材料。通过紫外-可见光、荧光、原子力显微镜、场发射扫描电子显微镜、差示扫描量热法和热重分析研究了硅树脂中掺入的量子点的光学、形态和热性能。当最初涂覆有三辛胺配体的量子点从氯仿溶剂转移到高粘度的甲基苯基硅油和有机硅树脂时，量子点表现出浊度增加和荧光强度降低。通过使用聚(1, 1-二甲基硅氮烷)（多硅氮烷）、六亚甲基二胺（二胺）、半胱胺（氨基硫醇）、三乙基硅烷（反应性氢硅烷）、六甲基二硅氮烷、九甲基三硅氮烷、八甲基环四硅氮烷等各种功能配体研究荧光增强 （反应性胺）。结果表明，活性胺是增强分散在有机硅树脂中的CdSe/ZnS量子点荧光的良好添加剂配体，分别提供1.2-2.48 Im/W和4.2-5.56%的较高发光效率和光致发光转换效率。我们推测这些活性胺向表面电子陷阱提供电子，从而减少电荷复合。此外，量子点聚集形成相对均匀分散在有机硅树脂基体中的量子点簇，由于表面钝化而表现出良好的发射性能，并且在树脂中添加硅氮烷化合物而表现出良好的胶体稳定性。此外，在量子点-有机硅树脂体系中添加硅氮烷化合物也显示出所合成的纳米复合材料的热稳定性得到改善。
Our research focused on the morphological and optical properties of core/shell cadmium selenide/zinc sulfide (CdSe/ZnS) quantum dots incorporated in silicone resin. After dispersing ligand-coated quantum dots into Dow Corning two-component silicone resins (OE6630A and OE6630B at 1:4 mixing ratio by weight), the resins were cured at 150 degrees C for 1.5 hours to produce the quantum dot-silicone resin nanocomposites. The optical, morphological and thermal properties of the quantum dot incorporated in silicone resin were investigated by ultraviolet-visible, fluorescence, atomic force microscopy, field emission scanning electron microscopy, differential scanning calorimetry and thermogravimetric analysis. When the quantum dots, originally coated with trioctylamine ligand, were transferred from a chloroform solvent to methyl phenyl silicone oil and silicone resins of high viscosity, the quantum dots showed increased turbidity and lowered fluorescence intensity. Fluorescence enhancement was investigated by using various functional ligands such as poly(1, 1-dimethyl silazane) (multi-silazane), hexamethylenediamine (diamine), cysteamine (amino-thiol), triethylsilane (reactive hydrosilane), hexamethyldisilazane, nonamethyltrisilazane, octamethylcyclotetrasilazane (reactive amines). The results showed that the reactive amines were good additive ligands for enhancing the fluorescence of CdSe/ZnS quantum dots dispersed in the silicone resins, providing 1.2-2.48 Im/W and 4.2-5.56% higher luminous efficiency and photoluminescence conversion efficiency, respectively. We speculate that these reactive amines donate electrons to the surface electron traps, thereby reducing charge recombination. In addition, quantum dots aggregate to form quantum dot clusters with a relatively homogeneously dispersed in the silicone resin matrices, showing good emission properties due to surface passivation and good colloidal stability with the addition of silazane compounds to the resin. Furthermore, the addition of silazane compounds to quantum dots-silicone resin system also shows the improved thermal stability of the as-synthesized nanocomposites.