2021/12/14 by A. Allemand, Florian Kulzer, Allemand, A. +7
Engineering · Materials Science · Physics and Astronomy · #Chemical Physics (physics.chem-ph) #FOS: Physical sciences #Photonic and Optical Devices #Quantum Dots Synthesis And Properties #Semiconductor Quantum Structures and Devices
paper · pdf · doi:10.48550/arxiv.2112.07788
openalex publication_date 2021/12/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We have synthesized CdS(1.3 nm)/CdSe(1.7 nm)/CdS(3.4 nm) spherical quantum wells with 13 nm diameter and demonstrated the first antibunching of their emission, labelling them as single-photon sources. Antibunching survives even at high excitation intensities, ruling-out bi-exciton emission. For the largest intensities, antibunching coupled to spectral measurements, reveal the signature of a blue-shifted emission, associated to an irreversible photo-aging effect. We demonstrate a moderate correlation between the main and the blue-shifted emission energy. Intensity-timetraces show low-blinking, with a median time spent in the bright state of 89 %. Emission lifetime measurements reveal a complex emission dynamic with either three or four components. While spherical quantum wells have been initially designed for laser-oriented applications, we demonstrate that they can serve as single-photon sources.