Luminescence of Cu²⁺-Doped ZnSe Quantum Dots with Different Parameters

Abstract:

Cu2+-doped ZnSe quantum dots (ZnSe:Cu2+ QDs) are synthesized in aqueous solution via a co-precipitation method with thioglycolic acid (TGA) as a stabilizer. Green emission is observed under 365 nm UV excitation. X-ray diffraction patterns and transmission electron microscopy image show that ZnSe:Cu2+ QDs are sphalerite cubic structure, similar to round in shape, the average diameter is 6 nm. The concentration of Cu2+ ions and TGA, pH, reaction time and aging time have influences on optical properties of ZnSe:Cu2+ QDs. The luminescence of as-prepared products with different parameters is characterized using fluorescence spectrophotometer. The high fluorescence intensity has been got when the concentration of Cu2+ ions is 4.0% (molar ratio), TGA is 83.4 μl (mol ratio Zn: TGA=1:2), pH is 9.5, reaction time is 2h. The luminous intensity increases with the extension of aging time.

• Periodical: Advanced Materials Research (Volumes 148-149)
• Pages: 1268-1272
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.148-149.1268
• Online since: October 2010
• Authors: Qun Wang, Fu Tian Liu, Qing Hui Jiang, Xiu Xiu Chen, Dong Zhi Wang
• Keywords: Co-Precipitation, Fluorescence Property, Water-Soluble, ZnSe:Cu²⁺QDs

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