Photoluminescence (PL) efficiency of thioglycolic-acid (TGA)-stabilized CdTe nanocrystals in water depends strongly on the amount of TGA upon synthesis. The less the amount, the higher the PL efficiency obtained if the colloid is not precipitated. When the molar ratio of TGA against Cd2+ upon preparation is ca. 1.3, PL efficiency of as-prepared solution becomes the maximum and exceeds 60% in red-emitting region. In this case, the spectral widths of the PL become the minimum. We have encapsulated these highly luminescent nanocrystals into glass matrices by using a sol-gel method. Silane coupling agent having an amino-group is effective to preserve the surface of the nanocrystals. The glass thus prepared is stable and shows PL efficiency as high as 40%.
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This study was supported by the Nano-Glass Project of the Nanotechnology Materials Program, sponsored by the New Energy and Industrial Technology Development Organization, Japan. We acknowledge Dr. M. Ando for his help of preparing colloidal CdTe nanocrystals.
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Murase, N., Li, C. Synthesis of Highly Photoluminescent CdTe Nanocrystals and Their Incorporation into Glass Matrices. MRS Online Proceedings Library 829, 263–267 (2004). https://doi.org/10.1557/PROC-829-B3.6