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Studies from Fujian Institute of Research on the Structure of Matter Yield New Data on Crystal Growth [The relationship between photoluminescence...

August 8, 2014



Studies from Fujian Institute of Research on the Structure of Matter Yield New Data on Crystal Growth [The relationship between photoluminescence (PL) decay and crystal growth kinetics in thioglycolic acid (TGA) capped CdTe quantum dots (QDs)]

By a News Reporter-Staff News Editor at Health & Medicine Week -- Researchers detail new data in Crystal Growth. According to news reporting out of Fujian, People's Republic of China, by NewsRx editors, research stated, "The PL lifetime optimization of CdTe QDs capped with TGA has yet to be understood from a perspective of growth kinetics. In this work, the growth kinetics and PL properties of CdTe QDs growing in aqueous solutions of two TGA concentrations, 0 mM and 57 mM, were systematically investigated using UV, TEM, and PL methods."

Our news journalists obtained a quote from the research from the Fujian Institute of Research on the Structure of Matter, "CdTe QDs in 0 mM TGA solution were found to follow the mixed OA (Oriented Attachment)-OR (Ostwald Ripening) growth kinetics. The PL peaks experienced a red-shift with almost unchanged intensity and the PL lifetimes increased gradually. In 57 mM TGA solution, the QDs followed the OA dominated growth mechanism. The PL peak broadened greatly with a red-shift and its intensity decreased significantly. The PL lifetime increased much higher than that in 0 mM TGA solution. Based on the different growth kinetic models of the two systems, we suggest that in the low (0 mM) TGA solution, the increased surface defects induced by TGA desorption and the existence of partial internal defects caused by OA growth were the main reasons for the gradual increase of PL lifetime, while in high (57 mM) TGA solution, the increase of PL lifetime was ascribed to the abundant internal defects produced by OA collision. Finally, kinetic data showed the effect of the TGA concentration on crystal growth and PL lifetime of CdTe QDs."

According to the news editors, the research concluded: "The results might provide guidance for understanding the mechanism behind the phenomena of ligand-related PL properties."

For more information on this research see: The relationship between photoluminescence (PL) decay and crystal growth kinetics in thioglycolic acid (TGA) capped CdTe quantum dots (QDs). Physical Chemistry Chemical Physics, 2014;16(23):11747-53. (Royal Society of Chemistry - www.rsc.org/; Physical Chemistry Chemical Physics - pubs.rsc.org/en/journals/journalissues/cp)

Our news journalists report that additional information may be obtained by contacting X. Lv, State Key Laboratory of Structures, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, People's Republic of China. Additional authors for this research include X. Xue, Y. Huang, Z. Zhuang and Z. Lin (see also Crystal Growth).

Keywords for this news article include: Asia, Fujian, Quantum Dots, Crystal Growth, Quantum Physics, People's Republic of China.

Our reports deliver fact-based news of research and discoveries from around the world. Copyright 2014, NewsRx LLC


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Source: Health & Medicine Week


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