Improved Luminescence Properties and Thermal Stability of ZnS
Quantum Dots by Organic and Inorganic Passivation

Chin. Phys. Lett.

2002, Vol. 19

Issue (7): 967-969 DOI:

Original Articles

Improved Luminescence Properties and Thermal Stability of ZnS Quantum Dots by Organic and Inorganic Passivation

Hatim Mohamed El-Khair;XU Ling;CHEN Kun-Ji;MA Yi;ZHANG Yu;LI Ming-Hai;HUANG Xin-Fan

State Key Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093

Cite this article:

Hatim Mohamed El-Khair, XU Ling, CHEN Kun-Ji et al 2002 Chin. Phys. Lett. 19 967-969

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Abstract ZnS quantum dots (QDs) synthesized in water and ethanol solutions were coated with polystyrene (PS) and SiO₂ shells, respectively. The band edge emission was enhanced by nearly five times after PS coating and about 13 times after SiO₂ coating, because the surface trap states were removed. From the photoluminescence properties of ZnS QDs coated with PS and SiO₂ shells we have detected the improvement of thermal stability. This is due to the fact that the surface passivation can prevent the further growth of the ZnS QDs and the diffusion of oxygen on the surface of ZnS QDs during thermal oxidation.

Keywords: 71.55.Gs 78.55.Et 81.65.Rv

Published: 01 July 2002

PACS:	71.55.Gs	(II-VI semiconductors)
	78.55.Et	(II-VI semiconductors)
	81.65.Rv	(Passivation)

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https://cpl.iphy.ac.cn/ OR https://cpl.iphy.ac.cn/Y2002/V19/I7/0967

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	Hatim Mohamed El-Khair
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	LI Ming-Hai
	HUANG Xin-Fan

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