Investigation of Factors Induced the Non-Intrinsic Optical Properties for Water-Soluble CdSe Semiconductor Quantum Dots

Abstract:

For the purpose of investigating the factors induced the non-band-edge excitation optical properties of water-soluble CdSe semiconductor quantum dots (QDs), the initial molar ratio of Cd and Se(or Cd/Se), the temperature of crystal nucleation and growing, the time of the growth etc. are systematically studied in the fabricated process. The properties of the as-prepared nano-particles (NPs) have been characterized by ultraviolet-visible absorption spectra (UV-Vis), photoluminescence (PL) spectroscopy, X-ray powder diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), and X-ray photoelectron spectroscopy (XPS). The measured results show that it is possible to exist surface trapping, impurities and other defect energy states in the products with the non-band-edge excitation PL properties, and all the characteristics are involved with the different synthetic routes and prepared techniques.

• Periodical: Materials Science Forum (Volumes 663-665)
• Pages: 437-440
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.663-665.437
• Online since: November 2010
• Authors: Heng Kang Qiu, Yue Shen, Lin Jun Wang, Jian Cheng Zhang, Kai Feng Qin
• Keywords: CdSe, Non-Band-Edge Excitation, Quantum Dot (QD)

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