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

被引：3

作者：

Vivas, Marcelo Goncalves ^{[1
,2
]}

Leandro De Sousa, Jose Carlos ^{[3
]}

De Boni, Leonardo ^{[2
]}

Schiavon, Marco Antonio ^{[3
]}

Mendonca, Cleber Renato ^{[2
]}

机构：

[1] Univ Fed Alfenas, Inst Ciencia & Tecnol, BR-37715400 Pocos De Caldas, MG, Brazil

[2] Univ Sao Paulo, Inst Fis Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil

[3] Univ Fed Sao Joao del Rei, Dept Ciencias Nat, BR-36301160 Sao Joao Del Rei, MG, Brazil

来源：

MATERIALS | 2017年 / 10卷 / 04期

基金：

巴西圣保罗研究基金会;

关键词：

CdTe quantum dots; 2PA transition channels; femtosecond two-photon spectroscopy; SYMMETRY-BREAKING; ABSORPTION; SIZE; NANOCRYSTALS;

D O I：

10.3390/ma10040363

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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, 1S(3/2)(h) -> 1S(e) and 2S(3/2)(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.

引用

页数：8

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