Journal
JOURNAL OF LUMINESCENCE
Volume 188, Issue -, Pages 529-532Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2017.05.001
Keywords
MoS2; Nanocrystal; Nanopowder; Pulsed cathodoluminescence; Raman spectra; Electron-holes; Electron energy density
Categories
Funding
- National Nanotechnology Laboratory of open type of al-Farabi Kazakh National University, Almaty, Kazakhstan [0263/PSF]
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Molybdenum disulfide nanocrystals exhibit direct dependencies of the Raman peaks' intensities and their positions on the thicknesses of the nanocrystals. This indicates dependencies of the electronic structure on the thickness of the flakes, which scatter differently various laser wavelengths (473 nm, 532 nm and 633 nm). Pulsed cathodoluminescence spectra of MoS2 nanocrystals under the action of high-energy electron pulse show an increase in the luminescence intensities with the increasing input of electron energy densities, where higher electron densities induce greater amount of electron-holes, which afterwards recombining release the energy in the form of luminescence. Irradiation of nanocrystals at maximum electron energy density of 200 mJ cm(-2) leads to a strong luminescence band at 655 nm (1.88 eV), which is explained by recombination of A exciton. The luminescence decay kinetics of the nanocrystals under the action of different electron energy densities is presented.
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