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Quantum efficiency of colloidal suspensions containing quantum dot/silica hybrid particles

机译：包含量子点/二氧化硅杂化粒子的胶体悬浮液的量子效率

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We have investigated the fluorescence properties of colloidal suspensions conntaining quantum dot (QD)/silica hybrid particles. First, we synthesized QD/silica hybrid particles with silica-QD-silica (SQS) core-shell-shell geometry, and monitored the quantum efficiencies of their suspensions at various particle concentrations. We found that the quantum efficiency (QE) of SQS particles in deionized (DI) water was much lower than that of the QDs even at low particle concentration, mainly due to the light scattering of emitted photons at the silica/water interface, followed by reabsorption by QDs. As the concentration of SQS particles was increased, both light scattering and reabsorption by QDs became more important, which further reduced the QE. Refractive index-matched solvent, however, reduced light scattering, yielding greater QE than DI water. Next, we induced aggregation of SQS particles, and found that QE increased as particles aggregated in DI water because of reduced light scattering and reabsorption, whereas it remained almost constant in the refractive index-matched solvent. Finally, we studied aggregation of highly concentrated silica particle suspensions containing a low concentration of SQS particles, and found that QE increased with aggregation because light scattering and reabsorption were reduced.
机译：我们已经研究了包含量子点（QD）/二氧化硅杂化颗粒的胶体悬浮液的荧光特性。首先，我们合成了具有二氧化硅-QD-二氧化硅（SQS）核-壳-壳几何形状的QD /二氧化硅杂化颗粒，并监测了它们在各种颗粒浓度下的悬浮液的量子效率。我们发现，即使在低颗粒浓度下，去离子（DI）水中SQS颗粒的量子效率（QE）也比QDs低得多，这主要是由于在二氧化硅/水界面处发射的光子的光散射所致，其次是被量子点重新吸收。随着SQS颗粒浓度的增加，QD的光散射和重吸收变得越来越重要，这进一步降低了QE。但是，折射率匹配的溶剂减少了光散射，比去离子水产生的量子效率更高。接下来，我们诱导了SQS颗粒的聚集，并发现由于减少的光散射和重新吸收，QE随着颗粒在去离子水中的聚集而增加，而在与折射率匹配的溶剂中，其几乎保持恒定。最后，我们研究了包含低浓度SQS颗粒的高浓度二氧化硅颗粒悬浮液的聚集，发现随着聚集的增加，QE会增加，因为减少了光散射和重吸收。

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