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Hybrid Colloidal Stabilization Mechanism toward Improved Photoluminescence and Stability of CdSe/CdS Core/Shell Quantum Dots
Langmuir ( IF 3.7 ) Pub Date : 2017-07-07 00:00:00 , DOI: 10.1021/acs.langmuir.7b01438 Fengyi Wu 1, 2 , Yugang Zhang 2 , Zhongping Zhang 1 , Guopeng Li 2 , Mingling Li 1 , Xinzheng Lan 2 , Tietun Sun 3 , Yang Jiang 2
Langmuir ( IF 3.7 ) Pub Date : 2017-07-07 00:00:00 , DOI: 10.1021/acs.langmuir.7b01438 Fengyi Wu 1, 2 , Yugang Zhang 2 , Zhongping Zhang 1 , Guopeng Li 2 , Mingling Li 1 , Xinzheng Lan 2 , Tietun Sun 3 , Yang Jiang 2
Affiliation
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Colloidal quantum dots can be stabilized in either a polar solvent or a nonpolar solvent depending on their surface chemistry. The former is typically achieved by charge stabilization while the latter by steric hindrance. This allows reversible tuning of their surface polarity for targeted application by engineering their ligand profile. Here we developed a hybrid stabilization approach that leveraged a combination of steric hindrance and charge stabilization simultaneously. We demonstrated this mechanism in a phase transfer process where hexane dispersed and hydrophobic CdSe/CdS core/shell quantum dots were exchanged into the hydrophilic dimethylformamide (DMF) phase. This was achieved by employing both Z-type cadmium acetate and X-type halide ligands. The results suggested only by using this hybrid stabilization strategy were we able to achieve good colloidal stability while preserving their photoluminescence quantum yield. This hybrid ligand strategy may promise new opportunities for the application of QDs in optoelectronic areas.
中文翻译：
混合胶体稳定机制，可改善CdSe / CdS核/壳量子点的光致发光和稳定性
胶体量子点可以在极性溶剂或非极性溶剂中稳定，具体取决于它们的表面化学性质。前者通常通过电荷稳定来实现，而后者则通过位阻实现。通过设计配体的轮廓，可以针对目标应用对它们的表面极性进行可逆调节。在这里，我们开发了一种混合稳定方法，该方法同时利用了位阻和电荷稳定的组合。我们在相转移过程中证明了这种机理，在该相转移过程中，已分散的己烷和疏水的CdSe / CdS核/壳量子点被交换为亲水的二甲基甲酰胺（DMF）相。这是通过同时使用Z型乙酸镉和X型卤化物配体实现的。仅通过使用这种杂化稳定策略表明的结果，我们就能够在保持其光致发光量子产率的同时实现良好的胶体稳定性。这种混合配体策略可能为量子点在光电领域的应用带来新的机遇。
更新日期：2017-07-08
中文翻译：
混合胶体稳定机制，可改善CdSe / CdS核/壳量子点的光致发光和稳定性
胶体量子点可以在极性溶剂或非极性溶剂中稳定，具体取决于它们的表面化学性质。前者通常通过电荷稳定来实现，而后者则通过位阻实现。通过设计配体的轮廓，可以针对目标应用对它们的表面极性进行可逆调节。在这里，我们开发了一种混合稳定方法，该方法同时利用了位阻和电荷稳定的组合。我们在相转移过程中证明了这种机理，在该相转移过程中，已分散的己烷和疏水的CdSe / CdS核/壳量子点被交换为亲水的二甲基甲酰胺（DMF）相。这是通过同时使用Z型乙酸镉和X型卤化物配体实现的。仅通过使用这种杂化稳定策略表明的结果，我们就能够在保持其光致发光量子产率的同时实现良好的胶体稳定性。这种混合配体策略可能为量子点在光电领域的应用带来新的机遇。
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