4.8 Article

One-Step Synthesis of High-Quality Gradient CdHgTe Nanocrystals: A Prerequisite to Prepare CdHgTe-Polymer Bulk Composites with Intense Near-Infrared Photoluminescence

期刊

CHEMISTRY OF MATERIALS
卷 20, 期 21, 页码 6764-6769

出版社

AMER CHEMICAL SOC
DOI: 10.1021/cm8018296

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资金

  1. National Basic Research Program of China [2007CB936402]
  2. National Natural Science Foundation of China [20804008, 20704014, 20534040]
  3. National Excellent Doctoral Dissertation of China [200734]
  4. Program of Introducing Talents of Discipline to Universities [B06009]
  5. Northeast Normal University [20070306]
  6. Program of Technological Progress of Jilin Province [20080101]

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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 photo I umi nescence (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.

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