Synthesis of Anisotropic CdSe/CdS Dot-in-Giant-Rod Nanocrystals with Persistent Blue-Shifted Biexciton Emission
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Otros documentos de la autoría: Polovitsyn, Anatolii; Khan, Ali Hossain; Angeloni, Ilaria; Grim, Joel Q.; Planelles, Josep; Climente, Juan I.
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http://dx.doi.org/10.1021/acsphotonics.8b01028 |
Metadatos
Título
Synthesis of Anisotropic CdSe/CdS Dot-in-Giant-Rod Nanocrystals with Persistent Blue-Shifted Biexciton EmissionAutoría
Fecha de publicación
2018Editor
American Chemical SocietyISSN
2330-4022Cita bibliográfica
POLOVITSYN, Anatolii, et al. Synthesis of Anisotropic CdSe/CdS Dot-in-Giant-Rod Nanocrystals with Persistent Blue-Shifted Biexciton Emission. ACS Photonics, 2018, vol. 5, no 11, p. 4561-4568Tipo de documento
info:eu-repo/semantics/articleVersión de la editorial
https://pubs.acs.org/doi/abs/10.1021/acsphotonics.8b01028Versión
info:eu-repo/semantics/publishedVersionPalabras clave / Materias
Resumen
Anisotropic single-phase wurtzite CdSe/CdS nanocrystals were synthesized by colloidal chemistry, introducing ZnCl2 to increase the shell growth in the radial direction. As a result, dot-in-giant-rod nanocrystals were ... [+]
Anisotropic single-phase wurtzite CdSe/CdS nanocrystals were synthesized by colloidal chemistry, introducing ZnCl2 to increase the shell growth in the radial direction. As a result, dot-in-giant-rod nanocrystals were obtained, with a core diameter that varied between 3.2 and 7.5 nm and an overall diameter between 15 and 22 nm, corresponding to a 14–26 ML CdS shell. In addition to an extended fluorescence lifetime, typical for CdSe/CdS heteronanocrystals, all samples also yielded a blue-shifted biexciton emission peak. This contrasts with existing data on CdSe/CdS dot-in-rod nanocrystals with a thin shell, which yield a type-I band offset and attractive biexciton interactions for CdSe/CdS with a core larger than about 2.8 nm. However, k·p calculations support the blue shift, with a significant electron delocalization into the CdS shell even for large core diameter. We assign this effect to the influence of strain at the CdSe/CdS interface and associated reduction of the conduction band offset, as well as the buildup of a piezoelectric field along the nanorod long axis. The strain-induced electron–hole separation is particularly effective in large-core nanocrystals, providing a tool to engineer electron and hole wave functions that is complementary to quantum confinement. [-]
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ACS Photonics, 2018, vol. 5, no 11Proyecto de investigación
Ministero degli Affari Esteri e della Cooperazione Internazionale: IONX-NC4SOL; MINECO: CTQ2017-83781-P; UJI project: B2017-59Derechos de acceso
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