Optical properties of individual CdS/CdSe/CdS nanocrystals: spherical quantum wells as single-photon sources - Archive ouverte HAL Access content directly
Journal Articles Nanotechnology Year : 2022

Optical properties of individual CdS/CdSe/CdS nanocrystals: spherical quantum wells as single-photon sources

Benoit Mahler
Christophe Dujardin
Julien Houel

Abstract

We have synthesized CdS(1.3 nm)/CdSe(1.7 nm)/CdS(3.4 nm) spherical quantum wells (SQWs) with a diameter of 13 nm and demonstrated the first photon-antibunching from their emission, labelling them as single-photon sources. Antibunching survives even at high excitation intensities, ruling-out strong emission from the bi-exciton. For the largest intensities, antibunching coupled to spectral measurements reveal the signature of a blue-shifted emission, associated to an irreversible photo-aging effect. A statistical analysis over 26 SQWs demonstrates a moderate correlation between the energy of the main and the blue-shifted emission. Intensity-timetraces recorded on 28 single SQWs show weak blinking, with a median time spent in the bright state of 89%. Their emission decay reveals a complex dynamic with either three or four exponential components. We assigned three of them to the neutral and singly-charged excitons and the slowest to defect emission. While SQWs have been initially designed for laser-oriented applications, we demonstrate that they can serve as efficient single-photon sources.

Dates and versions

hal-03650451 , version 1 (25-04-2022)

Identifiers

Cite

Aymeric Allemand, Florian Kulzer, Benoit Mahler, Christophe Dujardin, Julien Houel. Optical properties of individual CdS/CdSe/CdS nanocrystals: spherical quantum wells as single-photon sources. Nanotechnology, 2022, 33 (27), pp.275703. ⟨10.1088/1361-6528/ac5ee3⟩. ⟨hal-03650451⟩
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