Study of quantum size effects and optical characteristics in colloidal Cd1-xSnxTe quantum dotes

International Journal of Nano Dimension

مقاله 9، دوره 5، شماره 1، خرداد 2014، صفحه 57-61   

نوع مقاله: Reasearch Paper

شناسه دیجیتال (DOI): 10.7508/ijnd.2014.01.008

نویسندگان

M. Seyedsadjadi^{* 1}؛ F. Asgari¹؛ N. Farhadyar²؛ N. Molahasani³

¹Department of Chemistry, Science and Research Branch, Islamic Azad University, Tehran, 1477892855 Iran.

²Department of Chemistry, Varamin –Pishva Branch, Islamic Azad University, Varamin, Iran.

³Department of Chemistry, Tehran Shargh (Qiamdasht) Branch, Islamic Azad University, Tehran, Iran.

چکیده

In this work, we report, optical properties of Cd_1-xSn_xTe quantum dots (x= 0.05, 0.10 and 0.15) synthesized in water using thioglycolic acid (TGA) as a modifier agent. The optical characterization of the samples was performed through absorption (UV) and photoluminescence spectra (PL). A red shift absorption and fluorescent emission peaks was observed which can be related to the increase of nanocrystals diameter with pass the reaction time. This size dependent phenomenon is concerned to the known “quantum confinement” effect and the highest quantum yield has been achieved under our experimental conditions (using thioglycolic acid (TGA) as a modifier agent) when the processing time reached to 150 min.

کلیدواژه‌ها

Semiconductor nanocrystals؛ Colloidal quantum dots؛ Quantum yield؛ Crystalline growth؛ Quantum confinement