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Facile synthesis of multicolor tunable ultrasmall LiYF4:Yb,Tm,Er/LiGdF4 core/shell upconversion nanophosphors with sub-10 nm size.
- Source :
-
Dyes & Pigments . Apr2017, Vol. 139, p831-838. 8p. - Publication Year :
- 2017
-
Abstract
- Sub-10 nm-sized LiYF 4 :Yb,Tm/Er upconversion nanophosphors (UCNPs) and multicolor-emitting LiYF 4 :Yb,Tm,Er/LiGdF 4 core/shell (C/S) UCNPs were facilely synthesized by using rare earth-oleate (RE(oleate) 3 ) precursors. The size of LiYF 4 :Yb,Tm and LiYF 4 :Yb,Er UCNPs with single tetragonal phase was controlled in the range of 3.2–9.6 nm and 3.0–9.0 nm, respectivley, by varying reaction temperature from 230 to 320 °C under the use of RE(oleate) 3 precursors. The sub-10 nm-sized LiYF 4 :Yb(25%),Tm(0.5%)/LiGdF 4 (9.7 nm) and LiYF 4 :Yb(18%),Er(2%)/LiGdF 4 (9.5 nm) C/S UCNPs were successfully synthesized from ultrasmall LiYF 4 -based UCNP cores smaller than 5 nm in size. The blue- and green-emitting sub-10 nm-sized LiYF 4 :Yb,Tm/LiGdF 4 and LiYF 4 :Yb,Er/LiGdF 4 C/S UCNPs exhibited 566 and 48,245 times higher upconversion luminescence intensities than their core counterparts, respectivley, under excitation with 980 nm near infrared light. In addition, multicolor tunable sub-10 nm-sized LiYF 4 :Yb,Tm,Er/LiGdF 4 C/S UCNPs were synthesized and they emitted bright blue, sky blue, aquamarine, and green light by varying dopant composition (Tm and Er) and concentration. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01437208
- Volume :
- 139
- Database :
- Academic Search Index
- Journal :
- Dyes & Pigments
- Publication Type :
- Academic Journal
- Accession number :
- 120984904
- Full Text :
- https://doi.org/10.1016/j.dyepig.2016.12.048