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http://dx.doi.org/10.5012/jkcs.2009.53.6.677

Syntheses and Properties of ZnS:Mn/ZnS Core-Shell Quantum Dots Prepared via Thermal Decomposition Reactions of Organometallic Precursors at Various Reaction Temperatures  

Lee, Jae-Woog (Department of Chemistry, Institute of Nanosensor and Biotechnology, Dankook University)
Hwang, Cheong-Soo (Department of Chemistry, Institute of Nanosensor and Biotechnology, Dankook University)
Publication Information
Journal of the Korean Chemical Society / v.53, no.6, 2009 , pp. 677-682 More about this Journal
Abstract
ZnS:Mn/ZnS core-shell quantum dots (QDs), were synthesized via a thermal decomposition reaction of organometallic precursors in a hot solvent mixture. The synthetic conditions of the quantum dots were monitored at various reaction temperatures for the core formation, while the shell formation temperature was fixed at 135$^{\circ}C$. The obtained colloidal nanocrystals at corresponding temperatures were characterized by UV-Vis, solution photoluminescence (PL) spectroscopies, and further obtained powders were characterized by XRD, HR-TEM, and EDXS analyses. The synthetic temperature condition to obtain the best PL emission intensity for the core-shell QD was 135$^{\circ}C$, for both core and shell formation. At this temperature, solution PL spectrum showed a narrow emission peak at 583 nm with a relative PL quantum efficiency of 42.15%. In addition, the measured spherical particle sizes for the ZnS:Mn/ZnS nanocrystals via HR-TEM were in the range of 4.0 to 5.4 nm, while ellipsoidal particles were obtained at 150$^{\circ}C$.
Keywords
Core-shell quantum dot; ZnS:Mn/ZnS nanocrystal; Organometallic route;
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