Synthesis of Hexagonal-Phase Core−Shell NaYF4 Nanocrystals with Tunable Upconversion Fluorescence

Hexagonal-phase core−shell-structured NaYF4:Yb,Tm@β-NaYF4:Yb,Er and β-NaYF4:Yb,Tm@β-NaYF4:Yb,Er@β-NaYF4:Yb,Tm nanocrystals were synthesized by a seeded growth approach. β-NaYF4:Yb,Tm nanocrystals with 20 nm diameter were used as seed crystals to induce the growth of β-NaYF4:Yb,Er and then β-NaYF4:Yb...

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Bibliographic Details
Published in:Langmuir 2008-11, Vol.24 (21), p.12123-12125
Main Authors: Qian, Hai-Sheng, Zhang, Yong
Format: Article
Language:English
Subjects:
Chemistry
Colloidal state and disperse state
Exact sciences and technology
Fluorescence
Fluorides - chemical synthesis
General and physical chemistry
Nanoparticles
Surface physical chemistry
Yttrium
Online Access:Get full text
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Summary:Hexagonal-phase core−shell-structured NaYF4:Yb,Tm@β-NaYF4:Yb,Er and β-NaYF4:Yb,Tm@β-NaYF4:Yb,Er@β-NaYF4:Yb,Tm nanocrystals were synthesized by a seeded growth approach. β-NaYF4:Yb,Tm nanocrystals with 20 nm diameter were used as seed crystals to induce the growth of β-NaYF4:Yb,Er and then β-NaYF4: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.
ISSN:0743-7463
1520-5827
DOI:10.1021/la802343f