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Materials 2017, 10(4), 363; doi:10.3390/ma10040363

Observation of Distinct Two-Photon Transition Channels in CdTe Quantum Dots in a Regime of Very Strong Confinement

1
Instituto de Ciência e Tecnologia, Universidade Federal de Alfenas, Poços de Caldas, Minas Gerais 37715-400, Brazil
2
Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, São Paulo 13560-970, Brazil
3
Departamento de Ciências Naturais, Universidade Federal de São João del-Rei, São João del-Rei, Minas Gerais 36301-160, Brazil
*
Authors to whom correspondence should be addressed.
Academic Editor: Qing-Hua Xu
Received: 20 January 2017 / Revised: 21 March 2017 / Accepted: 23 March 2017 / Published: 30 March 2017
(This article belongs to the Special Issue Two-Photon Absorption Materials)
View Full-Text   |   Download PDF [1016 KB, uploaded 30 March 2017]   |  

Abstract

We report here on the direct observation of distinct two-photon transition channels in glutathione-capped (GSH) CdTe quantum dots (QDs) in a very strong confinement regime. CdTe-GSH QDs with different average diameters (2.5, 3.0, and 3.3 nm) were synthesized through the one-pot method and their two-photon absorption (2PA) spectrum determined by a femtosecond wavelength-tunable Z-scan. Our results show that the two lower-energy one-photon-allowed excitonic transitions, 1S3/2(h) → 1S(e) and 2S3/2(h) → 1S(e), are also accessed via 2PA. These results were ascribed to the relaxation of the parity selection rules due to the noncentrosymmetric structure of the CdTe QDs (zinc-blended structure), whose magnitude are determined by surface defects and structural irregularities present in CdTe-GSH QDs, in the strong confinement regime. View Full-Text
Keywords: CdTe quantum dots; 2PA transition channels; femtosecond two-photon spectroscopy CdTe quantum dots; 2PA transition channels; femtosecond two-photon spectroscopy
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MDPI and ACS Style

Gonçalves Vivas, M.; Leandro De Sousa, J.C.; De Boni, L.; Schiavon, M.A.; Mendonca, C.R. Observation of Distinct Two-Photon Transition Channels in CdTe Quantum Dots in a Regime of Very Strong Confinement. Materials 2017, 10, 363.

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