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Synthesis of CdTe Quantum Dots with Tunable Photoluminescence Using Tellurium Dioxide as Tellurium Source
Author(s) -
Liu Shengyan,
Wang Yilin,
Yang Kun,
Zhou Liya
Publication year - 2012
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.201200601
Subject(s) - tellurium , photoluminescence , chemistry , cadmium telluride photovoltaics , quantum dot , quantum yield , aqueous solution , yield (engineering) , analytical chemistry (journal) , inorganic chemistry , nanotechnology , optoelectronics , optics , organic chemistry , materials science , fluorescence , physics , metallurgy
A simple and convenient method has been developed for synthesis of water‐soluble CdTe quantum dots (QDs) under ambient atmospheric conditions. In contrast to the traditional aqueous synthesis, green to red emitting CdTe QDs were prepared by using TeO 2 to replace Te or Al 2 Te 3 as tellurium source in this method. The influences of experimental variables, including pH value, 3‐mercaptopropionic acid (MPA)/Cd and Te/Cd molar ratios, on the emission peak and photoluminescence (PL) quantum yield (QY) of the obtained CdTe QDs have been systematically investigated. Experimental results indicate that green to red emitting CdTe QDs with a maximum photoluminescence quantum yield of 35.4% can be prepared at pH 11.3 and n (Cd) : n (Te) : n (MPA) =1:0.1:1.7.