Suppression of grey state and optimization of the single photon emission of a colloidal semiconductor at room temperature

The excitation energy dependency of single colloidal CdSe-CdS core-shell nanocrystals is investigated at ambient conditions. It was demonstrated that the photoluminescence blinking effect is totally suppressed by optically exciting nanocrystals with a laser wavelength located at a very low absorptio...

Full description

Saved in:
Bibliographic Details
Published in:Applied physics letters 2018-09, Vol.113 (11)
Main Authors: Au, Thi Huong, Buil, Stéphanie, Quélin, Xavier, Hermier, Jean-Pierre, Lai, Ngoc Diep
Format: Article
Language:English
Subjects:
Absorption spectra
Applied physics
Blinking
Cadmium selenides
Condensed Matter
Excitation
Nanocrystals
Other
Photoluminescence
Photon emission
Physics
Quantum theory
Room temperature
Signal to noise ratio
Temperature dependence
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The excitation energy dependency of single colloidal CdSe-CdS core-shell nanocrystals is investigated at ambient conditions. It was demonstrated that the photoluminescence blinking effect is totally suppressed by optically exciting nanocrystals with a laser wavelength located at a very low absorption spectrum range. The mechanism of this effect is theoretically attributed to excitation of only the core instead of both the core and the shell. The signal to noise ratio and the photon count are also significantly improved and better purity in terms of single photon generation is achieved.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.5043250