NDLI: NaF-mediated controlled-synthesis of multicolor Na<sub>x</sub>ScF<sub>3+x</sub>:Yb/Er upconversion nanocrystals

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Inside back cover

Back cover

Nanoscale Vol - 7 Issue - 8

Nanoscale Vol - 7 Issue - 7

Nanoscale Vol - 7 Issue - 6

Nanoscale Vol - 7 Issue - 5

NaF-mediated controlled-synthesis of multicolor Na_xScF_3+x:Yb/Er upconversion nanocrystals

Content Provider	Royal Society of Chemistry (RSC)
Author	Lau, Raymond Wang, Lili Wu, Jiansheng Pei, Wen-Bo Huang, Ling Huang, Wei Chen, Bo Teng, Xue
Copyright Year	2015
Abstract	Synthesis of lanthanide-doped upconversion nanocrystals (LDUNs) with controlled morphology and luminescence has long been desired in order to fulfill various application requirements. In this work, we have investigated the effect of the NaF : Ln3+ molar ratio, in the range of 1 to 20, on the morphology, crystal structure, and upconversion properties of NaxScF3+x:Yb/Er nanocrystals that are reported to possess different upconversion properties from those of NaYF4:Yb/Er nanocrystals. The experimental results prove that the NaF : Ln3+ molar ratio influences significantly the growth process of the nanocrystals, i.e. a low NaF : Ln3+ molar ratio results in hexagonal NaScF4 nanocrystals, while a high NaF : Ln3+ molar ratio favors monoclinic Na3ScF6 nanocrystals. When the NaF : Ln3+ molar ratio is as high as 6 or above, phase separation is found and hexagonal NaYbF4 nanocrystals showed up for the first time. Simply by adjusting the NaF : Ln3+ molar ratio, we have successfully achieved the simultaneous control of the shape, size, as well as the crystallographic phase of the NaxScF3+x:Yb/Er nanocrystals, which give different red to green (R/G) ratios (integral area), leading to a multicolor upconversion luminescence from orange-red to green. This study provides a vivid example to track and interpret the formation mechanisms and growth processes of NaxScF3+x:Yb/Er nanocrystals, which shall be instructive for guiding the controlled synthesis of other LDUNs and extending their according applications in optical communication, color display, anti-counterfeiting, bioimaging, and so on.
Starting Page	4048
Ending Page	4054
Page Count	7
File Format	HTM / HTML PDF
ISSN	20403364
Volume Number	7
Issue Number	9
Journal	Nanoscale
DOI	10.1039/c4nr06637e
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Monoclinic crystal system Vivid (band) Luminescence Optical communication Integral Counterfeit
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology

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