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Interstitial sulfur photoluminescence in thermochemically synthesized CdS nanocrystals (NCs)

Published online by Cambridge University Press:  28 September 2011

M. Molaei ,
E. Saievar Iranizad ,
M. Marandi  and
N. Taghavinia
M. Molaei
Affiliation:
Physics Department, Tarbiat Modares University, Tehran, Islamic Republic of Iran
E. Saievar Iranizad*
Affiliation:
Physics Department, Tarbiat Modares University, Tehran, Islamic Republic of Iran
M. Marandi
Affiliation:
Physics Department, Arak University, Arak, Islamic Republic of Iran
N. Taghavinia
Affiliation:
Physics Department, Sharif University of Technology, Tehran, Islamic Republic of Iran
*
ae-mail: [email protected]
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Abstract

We have synthesized CdS NCs (NCs) by a thermochemical approach. CdSO4 and Na2S2O3 were used as the precursors and thioglycolic acid (TGA) was used as capping agent molecule. The structure and optical property of the NCs were characterized by means of XRD, TEM, UV-visible optical spectroscopy and photoluminescence (PL). XRD and TEM analyses demonstrated hexagonal phase CdS NCs with an average size of around 2 nm. Synthesized NCs exhibited a band gap of about 3.21 eV and showed a broad band emission from 400 to 750 nm centered at 503 nm. This broad band emission is related to surface states of CdS and our results showed that the emission peak can be attributed to the interstitial sulfur. The best attained photoluminescence quantum yield of the NCs was about 11%. At the same conditions the PL quantum yield of TGA capped NCs was about 20 times higher than that of TG capped NCs.

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 56 , Issue 1: Topical Issue: 5th Colloquium Interdisciplinary in Instrumentation (C2I) 2010 , October 2011 , 10401
Copyright
© EDP Sciences, 2011

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