TY - JOUR
T1 - Controlled Dopant Migration in CdS/ZnS Core/Shell Quantum Dots
AU - Hofman, Elan
AU - Robinson, Richard John
AU - Li, Zhi Jun
AU - Dzikovski, Boris
AU - Zheng, Weiwei
N1 - Publisher Copyright:
© 2017 American Chemical Society.
PY - 2017/7/5
Y1 - 2017/7/5
N2 - The physical properties of a doped quantum dot (QD) are strongly influenced by the dopant site inside the host lattice, which determines the host-dopant coupling from the overlap between the dopant and exciton wave functions of the host lattice. Although several synthetic methodologies have been developed for introducing dopants inside the size-confined semiconductor nanocrystals, the controlled dopant-host lattice coupling by dopant migration is still unexplored. In this work, the effect of lattice mismatch of CdS/ZnS core/shell QDs on Mn(II) dopant behavior was studied. It was found that the dopant migration toward the alloyed interface of core/shell QDs is a thermodynamically driven process to minimize the lattice strain within the nanocrystals. The dopant migration rate could be represented by the Arrhenius equation and therefore can be controlled by the temperature and lattice mismatch. Furthermore, the energy transfer between host CdS QDs and dopants can be finely turned in a wide range by dopant migration toward the alloyed interface during ZnS shell passivation, which provides an efficient method to control both the number of the emission band and the ratio of the emission from the host lattice and dopant ions.
AB - The physical properties of a doped quantum dot (QD) are strongly influenced by the dopant site inside the host lattice, which determines the host-dopant coupling from the overlap between the dopant and exciton wave functions of the host lattice. Although several synthetic methodologies have been developed for introducing dopants inside the size-confined semiconductor nanocrystals, the controlled dopant-host lattice coupling by dopant migration is still unexplored. In this work, the effect of lattice mismatch of CdS/ZnS core/shell QDs on Mn(II) dopant behavior was studied. It was found that the dopant migration toward the alloyed interface of core/shell QDs is a thermodynamically driven process to minimize the lattice strain within the nanocrystals. The dopant migration rate could be represented by the Arrhenius equation and therefore can be controlled by the temperature and lattice mismatch. Furthermore, the energy transfer between host CdS QDs and dopants can be finely turned in a wide range by dopant migration toward the alloyed interface during ZnS shell passivation, which provides an efficient method to control both the number of the emission band and the ratio of the emission from the host lattice and dopant ions.
UR - http://www.scopus.com/inward/record.url?scp=85022000615&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85022000615&partnerID=8YFLogxK
U2 - 10.1021/jacs.7b02320
DO - 10.1021/jacs.7b02320
M3 - Article
C2 - 28595009
AN - SCOPUS:85022000615
SN - 0002-7863
VL - 139
SP - 8878
EP - 8885
JO - Journal of the American Chemical Society
JF - Journal of the American Chemical Society
IS - 26
ER -