Multicolor light emitters based on energy exchange between Tb and Eu ions co-doped into ultrasmall β-NaYF 4 nanocrystals
AuthorsPodhorodecki, Artur P.
Misiewicz, Jan J.
O'Brien, Paul J.
Cha, Dong Kyu
KAUST DepartmentImaging and Characterization Core Lab
Advanced Nanofabrication, Imaging and Characterization Core Lab
MetadataShow full item record
AbstractMulticolor emission is reported from ultrasmall (<10 nm) β-NaYF4:Eu,Tb nanocrystals depending on the excitation wavelengths or emission detection delay time. Detailed optical investigations of three samples (NaYF4:Eu, NaYF4:Tb and NaYF4:Eu,Tb) obtained by a co-thermolysis method have been carried out. Photoluminescence, photoluminescence excitation and emission decay time obtained at different excitation wavelengths have been measured. Excitation mechanisms of Eu and Tb ions have been explained based on the experimental results and calculations using Judd-Ofelt theory. It has been shown that efficient energy transfer from Tb to Eu ions accounts for the efficient red emission of NaYF4:Tb,Eu nanocrystals. © The Royal Society of Chemistry 2012.
SponsorsThe authors thank the National Centre for Research and Development for financial support within the LIDER project no. 014/L-2/10. Moreover, authors would like to thank Dr D. Piatkowski from Nicolaus Copernicus University, Torun, Poland, for writing the software used by us to calculate lanthanide energy levels. M.A. would like to thank the Center of Research Excellence in Renewable Energy, KFUPM, for the support and Prof. N. Tabet (Dept. Physics. KFUPM) for establishing the CORERE-KAUST collaboration. M.B. acknowledges the financial support from a fellowship co-financed by European Union within European Social Fund.
PublisherRoyal Society of Chemistry (RSC)
JournalJournal of Materials Chemistry