Enhanced Upconversion Luminescence in Yb3+/Tm3+-Codoped Fluoride Active Core/Active Shell/Inert Shell Nanoparticles through Directed Energy Migration
2014 (English)In: Nanomaterials, ISSN 2079-4991, Vol. 4, no 1, 55-68 p.Article in journal (Refereed) Published
The luminescence efficiency of lanthanide-doped upconversion nanoparticles is of particular importance for their embodiment in biophotonic and photonic applications. Here, we show that the upconversion luminescence of typically used NaYF4:Yb(3+)30%/Tm(3+)0.5% nanoparticles can be enhanced by similar to 240 times through a hierarchical active core/active shell/inert shell (NaYF4:Yb(3+)30%/Tm(3+)0.5%)/NaYbF4/NaYF4 design, which involves the use of directed energy migration in the second active shell layer. The resulting active core/active shell/inert shell nanoparticles are determined to be about 11 times brighter than that of well-investigated (NaYF4:Yb(3+)30%/Tm(3+)0.5%)/NaYF4 active core/inert shell nanoparticles when excited at similar to 980 nm. The strategy for enhanced upconversion in Yb3+/Tm3+-codoped NaYF4 nanoparticles through directed energy migration might have implications for other types of lanthanide-doped upconversion nanoparticles.
Place, publisher, year, edition, pages
2014. Vol. 4, no 1, 55-68 p.
upconversion, efficiency, core/shell, energy migration
IdentifiersURN: urn:nbn:se:kth:diva-154773DOI: 10.3390/nano4010055ISI: 000342201600004OAI: oai:DiVA.org:kth-154773DiVA: diva2:759656
QC 201410302014-10-302014-10-272014-10-30Bibliographically approved