Photoluminescent Properties of TGA-Capped CdTe Quantum Dots

Abstract:

An environmentally friendly synthesis was developed to fabricate aqueous CdTe quantum dots (QDs) using thilglycolic acid (TGA) as a capping agent. Optimal preparation conditions including pH (11.2) and TGA/Cd molar ratio (1.5:1) resulted in CdTe QDs with high photoluminescence (PL) quantum yield up to 56%. The TGA-capped CdTe QDs exhibited tunable PL from green to red. Lifetime measurement indicated that the average lifetime of the TGA-capped QDs increased with increasing their sizes (27.5 and 37.2 ns for the QDs with PL peak wavelength of 607 and 636 nm, respectively). The PL of the QDs revealed the dependence of temperature, in which the QDs exhibited a red-shifted PL peak with increasing temperature. Such PL behavior depended strongly on the QD sizes.

• Periodical: Advanced Materials Research (Volumes 306-307)
• Pages: 1262-1265
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.306-307.1262
• Online since: August 2011
• Authors: Zhi Min Yuan, Jie Yang, Yu Lan Zhang, Rui Li Zhang, Ning Liu, Yong Qiang Cao, Ai Yu Zhang, Yuan Na Zhu, Ping Yang
• Keywords: CdTe, Lifetime, Photoluminescence (PL), QDs, Temperature Dependence

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