Cadmium telluride quantum-dot-doped glass by the sol-gel technique

Connie Chia; Yu-Hua Kao; Yuhuan Xu; John D. Mackenzie

doi:10.1117/12.284131

2 October 1997 Cadmium telluride quantum-dot-doped glass by the sol-gel technique

Connie Chia, Yu-Hua Kao, Yuhuan Xu, John D. Mackenzie

Proceedings Volume 3136, Sol-Gel Optics IV; (1997) https://doi.org/10.1117/12.284131
Event: Optical Science, Engineering and Instrumentation '97, 1997, San Diego, CA, United States

Abstract

CdTe quantum dot (QD)-doped sodium borosilicate (NBS) glasses with particle sizes ranging from 2.4 nm to 8.5 nm were synthesized by the sol-gel technique. Two sol-gel methods were developed. Method (1) involves the immersion of CdO-doped gels in Na₂Te/methanol (MeOH) solution for 1 to 4 days at 60 degrees Celsius, followed by heat-treatment at 540 degree Celsius or 570 degrees Celsius for 6 to 12 hours in an inert atmosphere. In method 2, CdTe QDs were directly formed at various temperatures (520 degrees Celsius to 570 degrees Celsius) under a reducing atmosphere. The synthesis of CdTe QDs in the NBS glass was accomplished using cadmium nitrate [Cd(NO₃)₂] and telluric acid (H₆TeO₆) as the starting materials. The number density and particle size distribution of the CdTe nanocrystallites depend on the heat- treatment conditions for the reduction of Te⁶⁺ to Te^2- ions and their subsequent ions react with Cd²⁺ ions to form CdTe. The absorption edges of these glasses were blue-shifted due to quantum confinement depending on the concentration of the initial salt and the heat- treatment conditions.

Citation Download Citation

Connie Chia, Yu-Hua Kao, Yuhuan Xu, and John D. Mackenzie "Cadmium telluride quantum-dot-doped glass by the sol-gel technique", Proc. SPIE 3136, Sol-Gel Optics IV, (2 October 1997); https://doi.org/10.1117/12.284131

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