Photoluminescence decay dynamics and mechanism of energy transfer in undoped and Mn2+ doped ZnSe nanoparticles.
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.
Olano
Edward M
EM
Department of Chemistry, University of California, Santa Cruz, California 95064, USA.
Grant
Christian D
CD
Norman
Thaddeus J
TJ
Castner
Edward W
EW
Zhang
Jin Z
JZ
D003198:Computer Simulation; D003460:Crystallization / Q000379:methods; D004735:Energy Transfer; D007700:Kinetics; D008027:Light; D049449:Luminescence; D008345:Manganese / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects; D008422:Materials Testing; D008956:Models, Chemical; D049329:Nanostructures / Q000032:analysis / Q000737:chemistry*; D010777:Photochemistry / Q000379:methods*; D018036:Selenium Compounds / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects; D012666:Semiconductors; D012996:Solutions; D017967:Zinc Compounds / Q000032:analysis / Q000737:chemistry* / Q000528:radiation effects
D018036:Selenium Compounds; D012996:Solutions; D017967:Zinc Compounds; D008345:Manganese; C044696:zinc selenide