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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

Instituto de Ciência e Tecnologia, Universidade Federal de Alfenas, Poços de Caldas, Minas Gerais 37715-400, Brazil
Instituto de Física de São Carlos, Universidade de São Paulo, São Carlos, São Paulo 13560-970, Brazil
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]   |  


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

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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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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