AVS 53rd International Symposium
    Nanometer-scale Science and Technology Thursday Sessions
       Session NS-ThA

Paper NS-ThA8
ZnCdSe Ternary Nanophosphors

Thursday, November 16, 2006, 4:20 pm, Room 2016

Session: Nanoscale Material Processing
Presenter: P.H. Holloway, University of Florida
Authors: H.-J. Lee, University of Florida
H. Yang, Hongik University, South Korea
S.Y. Seo, University of Florida
P.H. Holloway, University of Florida
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ZnCdSe quantum dots have been synthesized by a high temperature colloidal method using trioctylphosphine oxide (TOPO) solutions. Oleic acid complexes of Cd and Zn were used for the metal sources in reactions that produced air-stable nanoparticles of CdSe and ZnSe, respectively. Minimal alloying was achieved during a one-step synthesis process that led to a ZnSe shell on a CdSe core. Reaction temperatures below 250C led to less alloying as evidenced by spectral shifts. The kinetics of alloying were slower at 250C as compared to quantum dots synthesized at 320C. Smaller nanocrystals were obtained at the lower growth temperature due to a smaller critical radius of nucleation, leading to a large nucleation rate. ZnCdSe nanorods were also synthesized from CdSe/ZnSe coreshell nanorods via a solution thermal alloying process at 270~280C. CdSe nanorods were prepared using tetradecylphosphonic acid (TDPA)/TOPO surfactants, and a ZnSe shell was grown on CdSe nanorods at 180~190C. These nanorods were characterized as a function of alloying time using X-ray diffraction, Raman, and transmission electron microscopy. The kinetics of alloying and properties of ZnCdSe nanophosphors will be discussed.