One-Step Synthesis of High-Quality Gradient CdHgTe Nanocrystals: A Prerequisite to Prepare CdHgTe−Polymer Bulk Composites with Intense Near-Infrared Photoluminescence
One-Step Synthesis of High-Quality Gradient CdHgTe Nanocrystals: A Prerequisite to Prepare CdHgTe−Polymer Bulk Composites with Intense Near-Infrared Photoluminescence
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DOI：
10.1021/cm8018296
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发表时间：
2008-10
影响因子：
8.6
通讯作者：
Haizhu Sun;Hao Zhang;Jieun Ju;Junhu Zhang;Gang Qian;Chunlei Wang;Bai Yang;Z. Wang
中科院分区：
文献类型：
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作者：
Haizhu Sun;Hao Zhang;Jieun Ju;Junhu Zhang;Gang Qian;Chunlei Wang;Bai Yang;Z. Wang
利用CdTe和HgTe在水介质中溶解度的巨大差异，我们证明了一种制备高质量的CdHgTe合金化纳米晶(NCS)的有效方法。得到的纳米碳管呈现出一种“核/壳”的梯度准“核/壳”结构，其中“核”富含HgTe，“壳”富含CdTe。这种独特的结构使其光致发光量子产率(QY)高达45%，并显著提高了其稳定性。由于CdHgTe NCS具有良好的稳定性，使得在550 nm激发下，成功地制备了在近红外光谱区(可调至1100~1400 nm)具有强荧光的纳米聚合物块体复合材料。不仅克服了制备−聚合物块体复合材料的困难，而且复合材料具有良好的热稳定性和发光稳定性，这对其未来的应用具有重要的意义。
We have demonstrated an efficient method to prepare high-quality CdHgTe alloyed nanocrystals (NCs) by making use of a large difference in the solubility between CdTe and HgTe in aqueous medium. The resultant NCs show a gradient quasi “core/shell” structure in which the “core” is rich in HgTe and the “shell” is rich in CdTe. This unique structure makes the photoluminescence (PL) quantum yield (QY) of CdHgTe NCs up to 45% and remarkably improves their stability. The excellent stability of CdHgTe NCs allows for the successful preparation of NC-polymer bulk composites with intense PL in the near-infrared spectral region (tunable from 1100 to 1400 nm) upon excitation at 550 nm. Not only is the difficulty of preparing the CdHgTe NC−polymer bulk composites overcome, but also the composites show excellent thermal and luminescent stabilities, which is of importance for their future applications.