Controlled synthesis of ultrasmall hexagonal NaTm0.02Lu 0.98-xYbxF4 nanocrystals with enhanced upconversion luminescence

Xuesong Zhai; Shusen Liu; Yongling Zhang; Guanshi Qin; Weiping Qin

doi:10.1039/c3tc31760a

Controlled synthesis of ultrasmall hexagonal NaTm_0.02Lu _0.98-xYb_xF₄ nanocrystals with enhanced upconversion luminescence

Xuesong Zhai, Shusen Liu, Yongling Zhang, Guanshi Qin, Weiping Qin

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

Abstract

Ultrasmall upconversion (UC) nanoparticles with intense luminescence are quite desirable for in vitro and in vivo bioimaging. Herein, we report the successful synthesis of sub-10 nm hexagonal NaTm_0.02Lu _0.98-xYb_xF₄ nanocrystals via a high boiling solvent process. The sizes and phases of the crystals can be finely tailored by tuning the amounts of the ligands used (octadecylamine and sodium oleate) and the temperature. The intensity of the UC emission of the nanocrystals increases as the the relative content of Yb³⁺ ions increases from 20% to 98%, owing to improved near-infrared absorption and energy-transfer from Yb ³⁺ to Tm³⁺. The experimental results indicate that hexagonal NaYbF₄ is the best host for ultrasmall Tm ³⁺-doped UC nanoparticles and shows great potential in biomedical applications.

Original language	English
Pages (from-to)	2037-2044
Number of pages	8
Journal	Journal of Materials Chemistry C
Volume	2
Issue number	11
DOIs	https://doi.org/10.1039/c3tc31760a
State	Published - 21 Mar 2014
Externally published	Yes

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title = "Controlled synthesis of ultrasmall hexagonal NaTm0.02Lu 0.98-xYbxF4 nanocrystals with enhanced upconversion luminescence",

abstract = "Ultrasmall upconversion (UC) nanoparticles with intense luminescence are quite desirable for in vitro and in vivo bioimaging. Herein, we report the successful synthesis of sub-10 nm hexagonal NaTm0.02Lu 0.98-xYbxF4 nanocrystals via a high boiling solvent process. The sizes and phases of the crystals can be finely tailored by tuning the amounts of the ligands used (octadecylamine and sodium oleate) and the temperature. The intensity of the UC emission of the nanocrystals increases as the the relative content of Yb3+ ions increases from 20% to 98%, owing to improved near-infrared absorption and energy-transfer from Yb 3+ to Tm3+. The experimental results indicate that hexagonal NaYbF4 is the best host for ultrasmall Tm 3+-doped UC nanoparticles and shows great potential in biomedical applications.",

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AU - Zhai, Xuesong

AU - Liu, Shusen

AU - Zhang, Yongling

AU - Qin, Guanshi

AU - Qin, Weiping

PY - 2014/3/21

Y1 - 2014/3/21

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AB - Ultrasmall upconversion (UC) nanoparticles with intense luminescence are quite desirable for in vitro and in vivo bioimaging. Herein, we report the successful synthesis of sub-10 nm hexagonal NaTm0.02Lu 0.98-xYbxF4 nanocrystals via a high boiling solvent process. The sizes and phases of the crystals can be finely tailored by tuning the amounts of the ligands used (octadecylamine and sodium oleate) and the temperature. The intensity of the UC emission of the nanocrystals increases as the the relative content of Yb3+ ions increases from 20% to 98%, owing to improved near-infrared absorption and energy-transfer from Yb 3+ to Tm3+. The experimental results indicate that hexagonal NaYbF4 is the best host for ultrasmall Tm 3+-doped UC nanoparticles and shows great potential in biomedical applications.

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Controlled synthesis of ultrasmall hexagonal NaTm0.02Lu 0.98-xYbxF4 nanocrystals with enhanced upconversion luminescence

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Controlled synthesis of ultrasmall hexagonal NaTm_0.02Lu _0.98-xYb_xF₄ nanocrystals with enhanced upconversion luminescence