Synthesis of Highly Luminescent CdSe/ZnCdS Quantum Dots with Deep-Red Emissions

Abstract:

CdSe cores with larger radius were prepared by means of two-steps injection of the Cd precursor. Efforts were made to avoid the Ostwald ripening process during the quantum dots grown up. The prepared CdSe cores showed zinc-blende structure with size exceeded over 7 nm. The emission efficiency of prepared quantum dots were 15%, while it increased drastically up to 43% after the formation of ZnCdS shells on the CdSe cores. Morphologies and structures of the quantum dots were characterized by HR-TEM and XRD diffraction. The obtained quantum dots with emission wavelengths more than 660 nm were expected to find their applications in bio-imaging and plant illuminations.

• Periodical: Materials Science Forum (Volume 848)
• Pages: 466-471
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.848.466
• Online since: March 2016
• Authors: Jing Tan, Jian Quan Guo, Wei Na Wu, Qian Shi, Wei Li, Chun Liang Li
• Keywords: CdSe/ZnCdS, Deep-Red Emission, Luminescence Efficiency, Two-Step Injection

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