Synthesis of hexagonal-phase core-shell NaYF4 nanocrystals with tunable upconversion fluorescence.
Hexagonal-phase core-shell-structured NaYF 4:Yb,Tm@beta-NaYF 4:Yb,Er and beta-NaYF 4:Yb,Tm@beta-NaYF 4:Yb,Er@beta-NaYF 4:Yb,Tm nanocrystals were synthesized by a seeded growth approach. beta-NaYF 4:Yb,Tm nanocrystals with 20 nm diameter were used as seed crystals to induce the growth of beta-NaYF 4:Yb,Er and then beta-NaYF 4:Yb,Tm crystals, resulting in the formation of core-shell-structured nanocrystals with upconverting lanthanide ions Tm and Er doped in the core and shell, respectively.
Division of Bioengineering, Faculty of Engineering, National University of Singapore, Singapore.
Hai-Sheng
HS
Qian
Yong
Y
Zhang
D005453:Fluorescence; D005459:Fluorides / Q000138:chemical synthesis*; D053758:Nanoparticles; D015019:Yttrium
C525362:sodium yttriumtetrafluoride; D015019:Yttrium; D005459:Fluorides