Electronic Origin of Linearly Polarized Emission in CdSe/CdS Dot-in-Rod Heterostructures
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Altres documents de l'autoria: Planelles, Josep; Rajadell Viciano, Fernando; Climente, Juan I.
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Mostra el registre complet de l'elementcomunitat-uji-handle:10234/9
comunitat-uji-handle2:10234/7013
comunitat-uji-handle3:10234/8638
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Títol
Electronic Origin of Linearly Polarized Emission in CdSe/CdS Dot-in-Rod HeterostructuresData de publicació
2016-11Editor
American Chemical SocietyISSN
1932-7447Cita bibliogràfica
PLANELLES, Josep; RAJADELL, Fernando; CLIMENTE, Juan I. Electronic Origin of Linearly Polarized Emission in CdSe/CdS Dot-in-Rod Heterostructures. The Journal of Physical Chemistry C, 2016, vol. 120, no 48, p. 27724-27730.Tipus de document
info:eu-repo/semantics/articleVersió de l'editorial
http://pubs.acs.org/doi/abs/10.1021/acs.jpcc.6b11240Versió
info:eu-repo/semantics/acceptedVersionParaules clau / Matèries
Resum
Seeded CdSe/CdS nanorods exhibit intense polarized emission along the rod main axis. The degree of linear polarization cannot be explained by dielectric effects alone; an additional electronic contribution is present ... [+]
Seeded CdSe/CdS nanorods exhibit intense polarized emission along the rod main axis. The degree of linear polarization cannot be explained by dielectric effects alone; an additional electronic contribution is present whose nature has not been settled up to date. Using multiband k·p theory, we analyze the potential influence of several factors affecting excitonic emission and show that shear strain is the main electronic mechanism promoting linear polarization. It favors energetically light hole excitons over heavy hole ones, via deformation potential, and makes their radiative recombination faster via piezoelectricity. The implication of this mechanism is that linear emission can be enhanced by growing long but thin CdS shells around large, prolate CdSe cores, which indeed supports and rationalizes recent experimental findings. Together with the well-known dielectric effects, these results pave the way for controlled degree of linear polarization in dot-in-rods through dedicated structural design. [-]
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The Journal of Physical Chemistry C, 2016, vol. 120, no 48Drets d'accés
Copyright © 2016 American Chemical Society
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