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Träfflista för sökning "WFRF:(Wallenberg R) srt2:(2000-2004)"

Sökning: WFRF:(Wallenberg R) > (2000-2004)

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  • Chen, Wei, et al. (författare)
  • Crystal field, phonon coupling and emission shift of Mn2+ in ZnS:Mn nanoparticles
  • 2001
  • Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 89, s. 1120-1129
  • Tidskriftsartikel (refereegranskat)abstract
    • The Mn2+ emission wavelengths are at 591, 588, 581 and 570 nm, respectively, for the similar to 10, similar to4.5, similar to3.5 nm sized nanoparticles and the ZnS:Mn nanoparticles formed in an ultrastable zeolite-Y. To reveal the cause for the shift, the crystal field and phonon coupling were investigated. The results show that the predominant factor for the shift is the phonon coupling, whose strength is size dependent and is determined by both the size confinement and the surface modification of the nanoparticles. Although the crystal field strength decreases with the decreasing of the particle size, its change has little contribution to the emission shift of Mn2+ in ZnS:Mn nanoparticles. (C) 2001 American Institute of Physics.
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  • Chen, W, et al. (författare)
  • Pressure dependence of Mn2+ fluorescence in ZnS:Mn2+ nanoparticles
  • 2000
  • Ingår i: Journal of Luminescence. - 0022-2313. ; 91:3-4, s. 139-145
  • Tidskriftsartikel (refereegranskat)abstract
    • The photoluminescence of Mn2+ in ZnS : Mn2+ nanoparticles with an average size of 4.5 nm has been measured under hydrostatic pressure from 0 to 6 GPa. The emission position is red-shifted at a rate of −33.3±0.6 meV/GPa, which is in good agreement with the calculated value of −30.4 meV/GPa using the crystal field theory.
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  • Chen, W, et al. (författare)
  • Size dependence of Eu2+ fluorescence in ZnS:Eu2+ nanoparticles
  • 2001
  • Ingår i: Journal of Applied Physics. - : AIP Publishing. - 0021-8979 .- 1089-7550. ; 89:5, s. 2671-2675
  • Tidskriftsartikel (refereegranskat)abstract
    • The emission bands of the 4.2, 3.2 and 2.6 nm sized ZnS:Eu2+ nanoparticles are peaking at 670, 580 and 520 nm, respectively. The emission of the 4.2 nm sized nanoparticles originates from the recombination of the Eu2+-bound exciton, while the emission of the 3.2 and 2.6 nm sized nanoparticles is from the Eu2+ intra-ion transition of 4f(6)5d(1)(t(2g))-4f(7). Possible mechanisms for the size dependence of the 4f(6)5d(1)(t(2g))-4f(7) transition of Eu2+ in ZnS:Eu2+ nanoparticles were investigated, and it was concluded that the decreases in the electron-phonon coupling and in crystal field strength upon a decrease in size are the two major factors responsible for the shift. (C) 2001 American Institute of Physics.
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