Plasmon-exciton nanostructures, based on CdS quantum dots with exciton and trap state luminescence

Derepko, Violetta N.; Ovchinnikov, O. V.; Grevtseva, I. G.; Kondratenko, T. S.; Selyukov, A. S.; Turishchev, S. Yu.

doi:10.1016/j.jlumin.2022.118874

Cited by 7 publications

(1 citation statement)

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“…Because of the small particle size, the probability for defect to localize near the nanoparticle boundary is high. An electron excited inside a defect can be captured by surface functional groups, dangling bonds, and traps. − Electron trapping induces a dipole moment in the particle, which makes further excitation and emission of the defect impossible, until the electron is released from the trap and the surface state is empty. Such charged states can also affect dipole transitions of the defect.…”

Section: Resultsmentioning

confidence: 99%

Photocontrol of Single-Photon Generation in Boron Nitride Nanoparticles: Implications for Quantum Photon Sources, Sub-Diffraction Nanoscopy, and Bioimaging

Gritsienko

Matveev

Kurochkin

et al. 2022

ACS Appl. Nano Mater.

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Hexagonal boron nitride (h-BN) is a promising material for nanophotonics. Intrinsic and artificially induced defects in h-BN films, flakes, and nanoparticles are potential candidates as quantum emitters at room temperature. However, the energy structure and the methods for controlling these defects are still unclear. In this paper, we have obtained single-photon sources in ultrafine h-BN nanoparticles fabricated by a cost-effective ammonothermal dehydration. We demonstrate quantum-dot-like emission using photon autocorrelation and fluorescence intensity trace measurements in the red range. The results obtained using low-power near-ultraviolet coexcitation reveal the distinctive photophysical properties of fluorescent defects in the synthesized h-BN nanoparticles. We show that quantum emitters in nanoparticles can be switched from dark to bright mode by coexcitation photocontrol. The observed effects in nanoparticles were explained by various mechanisms of metastable state disabling. We also report a 2-fold improvement in the contrast of fluorescence images from h-BN nanoparticles under low-intensity laser scanning coexcitation. The research results can be used to develop efficient solid-state photon sources, as well as in nanoscopy employing biocompatible fluorescent nanoparticles.

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