Photoluminescence decay dynamics and mechanism of energy transfer in undoped and Mn2+ doped ZnSe nanoparticles.
J Nanosci Nanotechnol
; 5(9): 1492-7, 2005 Sep.
Article
em En
| MEDLINE
| ID: mdl-16193963
ABSTRACT
Energy transfer dynamics in Mn2+-doped ZnSe nanoparticles have been studied by monitoring the photoluminescence using time-integrated and time-resolved spectroscopic techniques. Upon Mn2+ doping, static photoluminescence (PL) spectra show that the bandedge excitonic state is quenched and the characteristic Mn2+ emission appears at 584 nm. Picosecond PL kinetics and femtosecond transient absorption studies have both found that the Mn2+ doping substantially shortens the average lifetimes of the bandedge excitonic state as well as shallow trap states. The energy transfer from ZnSe to Mn2+ likely follows two mechanisms, one mediated through trap states and another without.
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Base de dados:
MEDLINE
Assunto principal:
Fotoquímica
/
Semicondutores
/
Compostos de Zinco
/
Compostos de Selênio
/
Luminescência
/
Nanoestruturas
/
Manganês
/
Modelos Químicos
Tipo de estudo:
Evaluation_studies
/
Prognostic_studies
Idioma:
En
Ano de publicação:
2005
Tipo de documento:
Article