Facile synthesis of multicolor tunable ultrasmall LiYF4:Yb,Tm,Er/LiGdF4 core/shell upconversion nanophosphors with sub-10 nm size
- Authors
- Hong, A-Ra; Kim, Su Yeon; Cho, So-Hye; Lee, Kwangyeol; Jang, Ho Seong
- Issue Date
- 4월-2017
- Publisher
- ELSEVIER SCI LTD
- Keywords
- Upconversion; Nanophosphors; Core/shell structure; Multicolor tuning; Ultrasmall nanocrystals
- Citation
- DYES AND PIGMENTS, v.139, pp.831 - 838
- Indexed
- SCIE
SCOPUS
- Journal Title
- DYES AND PIGMENTS
- Volume
- 139
- Start Page
- 831
- End Page
- 838
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/84041
- DOI
- 10.1016/j.dyepig.2016.12.048
- ISSN
- 0143-7208
- Abstract
- Sub-10 nm-sized LiYF4:Yb,Tm/Er upconversion nanophosphors (UCNPs) and multicolor-emitting LiYF4:Yb,Tm,Er/LiGdF4 core/shell (C/S) UCNPs were facilely synthesized by using rare earth-oleate (RE(oleate)(3)) precursors. The size of LiYF4:Yb,Tm and LiYF4: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 degrees C under the use of RE(oleate)(3) precursors. The sub-10 nm-sized LiYF4:Yb(25%),Tm(0.5%)/LiGdF4 (9.7 nm) and LiYF4:Yb(18%),Er(2%)/LiGdF4 (9.5 nm) C/S UCNPs were successfully synthesized from ultrasmall LiYF4-based UCNP cores smaller than 5 nm in size. The blue-and green-emitting sub-10 nm-sized LiYF4:Yb,Tm/LiGdF4 and LiYF4:Yb,Er/LiGdF4 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 LiYF4:Yb,Tm,Er/LiGdF4 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. (C) 2016 Elsevier Ltd. All rights reserved.
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