Enhancement effect of illumination on the photoluminescence of water-soluble CdTe nanocrystals: Toward highly fluorescent CdTe/CdS core-shell structure
Enhancement effect of illumination on the photoluminescence of water-soluble CdTe nanocrystals: Toward highly fluorescent CdTe/CdS core-shell structure
复制标题
光照对水溶性 CdTe 纳米晶光致发光的增强效应：走向高荧光 CdTe/CdS 核壳结构
DOI：
10.1021/cm049172b
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发表时间：
2004-10-05
影响因子：
8.6
通讯作者：
Gao, MY
中科院分区：
文献类型：
--
作者：
Bao, HB;Gong, YJ;Gao, MY
用巯基乙酸（TGA）稳定的CdTe纳米晶在光照下有很强的光致发光增强效应。在优化条件下，室温下水溶液中CdTe纳米晶的荧光量子产率达到85%。光学测量结果表明，TGA的光降解而不是NC的光降解是导致PL增强效应的主要原因，因为在光照过程中TGA释放的硫离子与CdTe表面的镉离子配位，并在那里形成CdS的壳结构。X射线光电子能谱的结果进一步证明了在光照过程中在CdTe核上形成了CdS壳层。结果表明，CdTe/ CdS核壳纳米晶的胶体溶液非常稳定，光致发光量子产率高于80%。因此，本研究不仅揭示了光照的PL增强效应，而且为制备水溶性、高荧光的CdTe/CdS核壳纳米晶提供了一条有效的合成途径。
A strong photoluminescence enhancement effect of illumination on CdTe nanocrystals stabilized by thioglycolic acid (TGA) was observed. Under optimized conditions, the fluorescence quantum yield of CdTe nanocrystals in aqueous solution reached 85% at room temperature. Optical measurements indicated that the photodegradation of TGA rather than NCs was the main reason for the PL enhancement effect since sulfide ions released from TGA during illumination coordinated with cadmium ions on the surface of CdTe and formed a shell structure of CdS there. X-ray photoelectron spectroscopic results further proved the formation of CdS shell on the CdTe core during illumination. The colloidal solution of CdTe/ CdS core-shell nanocrystals with photoluminescence quantum yield higher than 80% turned out to be very stable. Therefore, the current investigations not only reveal the PL enhancement effect of illumination, but also provide a useful synthetic route for producing water-soluble and highly fluorescent CdTe/CdS core-shell nanocrystals.