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11 results on '"Granados del Águila, Andrés"'

1. Optical Spectroscopy of Dark and Bright Excitons in CdSe Nanocrystals in High Magnetic Fields

Author

Granados Del Águila, Andrés, Pettinari, G., Groeneveld, E., De Mello Donegá, C., Vanmaekelbergh, D., Maan, Jan C., Christianen, Peter C. M., Granados Del Águila, Andrés, Pettinari, G., Groeneveld, E., De Mello Donegá, C., Vanmaekelbergh, D., Maan, Jan C., and Christianen, Peter C. M.

Abstract

Low-temperature polarized and time-resolved photoluminescence spectroscopy in high magnetic fields (up to 30 T) has been used to study the spin-polarization, spin-relaxation, and radiative lifetimes of excitons in wurtzite semiconductor (e.g., CdSe) colloidal nanocrystals. The applied magnetic field leads to a significant degree of circular polarization of the exciton photoluminescence, accompanied by a reduction in the photoluminescence decay time. The circular polarization arises from the Zeeman splitting of exciton levels, whereas lifetime reduction results from a polarization-preserving field-induced mixing of exciton levels. We analyze these experimental findings in terms of a simple model that combines both Zeeman effect and exciton-level mixing, as a function of the relative orientation of the nanocrystal c-axis and the magnetic field. This model is able to simultaneously describe the degree of circular polarization and lifetime reduction of the exciton photoluminescence, permitting us to quantify ...

Published
2017

2. Optical Spectroscopy of Dark and Bright Excitons in CdSe Nanocrystals in High Magnetic Fields

Author

Condensed Matter and Interfaces, Sub Condensed Matter and Interfaces, Granados Del Águila, Andrés, Pettinari, G., Groeneveld, E., De Mello Donegá, C., Vanmaekelbergh, D., Maan, Jan C., Christianen, Peter C. M., Condensed Matter and Interfaces, Sub Condensed Matter and Interfaces, Granados Del Águila, Andrés, Pettinari, G., Groeneveld, E., De Mello Donegá, C., Vanmaekelbergh, D., Maan, Jan C., and Christianen, Peter C. M.

Published
2017

3. Optical Spectroscopy of Dark and Bright Excitons in CdSe Nanocrystals in High Magnetic Fields

Author

Condensed Matter and Interfaces, Sub Condensed Matter and Interfaces, Granados Del Águila, Andrés, Pettinari, G., Groeneveld, E., De Mello Donegá, C., Vanmaekelbergh, D., Maan, Jan C., Christianen, Peter C. M., Condensed Matter and Interfaces, Sub Condensed Matter and Interfaces, Granados Del Águila, Andrés, Pettinari, G., Groeneveld, E., De Mello Donegá, C., Vanmaekelbergh, D., Maan, Jan C., and Christianen, Peter C. M.

Published
2017

4. Optical Spectroscopy of Dark and Bright Excitons in CdSe Nanocrystals in High Magnetic Fields

Author

Condensed Matter and Interfaces, Sub Condensed Matter and Interfaces, Granados Del Águila, Andrés, Pettinari, G., Groeneveld, E., De Mello Donegá, C., Vanmaekelbergh, D., Maan, Jan C., Christianen, Peter C. M., Condensed Matter and Interfaces, Sub Condensed Matter and Interfaces, Granados Del Águila, Andrés, Pettinari, G., Groeneveld, E., De Mello Donegá, C., Vanmaekelbergh, D., Maan, Jan C., and Christianen, Peter C. M.

Published
2017

5. Effect of Electron-Hole Overlap and Exchange Interaction on Excitation Radiative Lifetimes of CdTe/CdSe Heteronanocrystals

Author

Granados Del Águila, Andrés, Groeneveld, E., Maan, J.C., de Mello-Donega, C., Christianen, P.C.M., Granados Del Águila, Andrés, Groeneveld, E., Maan, J.C., de Mello-Donega, C., and Christianen, P.C.M.

Abstract

Wave function engineering has become a powerful tool to tailor the optical properties of semiconductor colloidal nanocrystals. Core–shell systems allow to design the spatial extent of the electron (e) and hole (h) wave functions in the conduction- and valence bands, respectively. However, tuning the overlap between the e- and h-wave functions not only affects the oscillator strength of the coupled e–h pairs (excitons) that are responsible for the light emission, but also modifies the e–h exchange interaction, leading to an altered excitonic energy spectrum. Here, we present exciton lifetime measurements in a strong magnetic field to determine the strength of the e–h exchange interaction, independently of the e–h overlap that is deduced from lifetime measurements at room temperature. We use a set of CdTe/CdSe core/shell heteronanocrystals in which the electron–hole separation is systematically varied. We are able to unravel the separate effects of e–h overlap and e–h exchange on the exciton lifetimes, and we present a simple model that fully describes the recombination lifetimes of heteronanostructures (HNCs) as a function of core volume, shell volume, temperature, and magnetic fields.

Published
2016

9. Observation of the full exciton and phonon fine structure in CdSe/CdS dot-in-rod heteronanocrystals

Author

Debye Institute, Sub Condensed Matter and Interfaces, Sub Soft Condensed Matter, Sub Physical and Colloid Chemistry, Condensed Matter and Interfaces, Granados Del Águila, Andrés, Jha, Bhawana, Pietra, Francesca, Groeneveld, Esther, De Mello Donegá, Celso, Maan, Jan C., Vanmaekelbergh, Daniël, Christianen, Peter C M, Debye Institute, Sub Condensed Matter and Interfaces, Sub Soft Condensed Matter, Sub Physical and Colloid Chemistry, Condensed Matter and Interfaces, Granados Del Águila, Andrés, Jha, Bhawana, Pietra, Francesca, Groeneveld, Esther, De Mello Donegá, Celso, Maan, Jan C., Vanmaekelbergh, Daniël, and Christianen, Peter C M

Published
2014

10. Observation of the full exciton and phonon fine structure in CdSe/CdS dot-in-rod heteronanocrystals

Author

Debye Institute, Sub Condensed Matter and Interfaces, Sub Soft Condensed Matter, Sub Physical and Colloid Chemistry, Condensed Matter and Interfaces, Granados Del Águila, Andrés, Jha, Bhawana, Pietra, Francesca, Groeneveld, Esther, De Mello Donegá, Celso, Maan, Jan C., Vanmaekelbergh, Daniël, Christianen, Peter C M, Debye Institute, Sub Condensed Matter and Interfaces, Sub Soft Condensed Matter, Sub Physical and Colloid Chemistry, Condensed Matter and Interfaces, Granados Del Águila, Andrés, Jha, Bhawana, Pietra, Francesca, Groeneveld, Esther, De Mello Donegá, Celso, Maan, Jan C., Vanmaekelbergh, Daniël, and Christianen, Peter C M

Published
2014

11. Observation of the full exciton and phonon fine structure in CdSe/CdS dot-in-rod heteronanocrystals

Author

Debye Institute, Sub Condensed Matter and Interfaces, Sub Soft Condensed Matter, Sub Physical and Colloid Chemistry, Condensed Matter and Interfaces, Granados Del Águila, Andrés, Jha, Bhawana, Pietra, Francesca, Groeneveld, Esther, De Mello Donegá, Celso, Maan, Jan C., Vanmaekelbergh, Daniël, Christianen, Peter C M, Debye Institute, Sub Condensed Matter and Interfaces, Sub Soft Condensed Matter, Sub Physical and Colloid Chemistry, Condensed Matter and Interfaces, Granados Del Águila, Andrés, Jha, Bhawana, Pietra, Francesca, Groeneveld, Esther, De Mello Donegá, Celso, Maan, Jan C., Vanmaekelbergh, Daniël, and Christianen, Peter C M

Published
2014

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