title: Temperature dependence of up-conversion luminescence and photoluminescence of Mn2+ in ZnS:Mn2+ nanoparticles.
abstract: The photoluminescence (excited at both 300 nm and 383.5 nm) and up-conversion luminescence (excited at 767 nm) of the Mn2+ 4T1-->6A1 transition in both bulk and ZnS:Mn2+ nanoparticles have been measured as a function of temperature. The Mn2+ emission spectra shift monotonically to longer wavelengths at lower temperatures, whereas the intensity change of the luminescence is more complex. The complicated temperature behavior is explained by considering the processes of nonradiation relaxation via phonon coupling, exciton thermal dissociation (binding energy), energy transfer, carrier trapping, and the temperature change of the absorption spectra. The fact that the temperature dependence of the 767 nm excited up-conversion luminescence is the same as the 383.5 nm excited photoluminescence in both bulk and nanoparticles supports the conclusion that the up-conversion luminescence is due to two-photon absorption.
authors.affiliation: Pacific Northwest National Laboratory, P.O. Box 999, Richland, Washington 99352, USA.
authors.forename: A G
authors.initials: AG
authors.lastname: Joly
authors.forename: W
authors.initials: W
authors.lastname: Chen
authors.forename: J
authors.initials: J
authors.lastname: Roark
authors.forename: J Z
authors.initials: JZ
authors.lastname: Zhang
mesh_terms: D003460:Crystallization / Q000379:methods; D004735:Energy Transfer; D049449:Luminescence; D008345:Manganese / Q000737:chemistry* / Q000528:radiation effects*; D008863:Microspheres; D036103:Nanotechnology / Q000379:methods; D010777:Photochemistry / Q000379:methods; D012666:Semiconductors; D013057:Spectrum Analysis / Q000379:methods; D013440:Sulfides / Q000737:chemistry* / Q000528:radiation effects*; D013696:Temperature; D017967:Zinc Compounds / Q000737:chemistry* / Q000528:radiation effects*
chemical_list: D013440:Sulfides; D017967:Zinc Compounds; D008345:Manganese; C031238:zinc sulfide