Up-conversion nanowire and preparation method and application thereof

A nanowire and aqueous solution technology, applied in the field of upconversion nanowire and its preparation, can solve the problems of small aspect ratio, tedious and time-consuming one-dimensional structure, and achieve bright upconversion luminescence, good ductility and stretchability, high The effect of flexibility

Active Publication Date: 2020-10-09
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are few reports on the preparation of rare earth fluoride nanowires. The existing reports are basically synthesized by template method or hydrothermal method, which is tedious and time-consuming, and the obtained one-dimensional structure has a small aspect ratio (<50), and most of them are nanometers. rods not nanowires

Method used

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  • Up-conversion nanowire and preparation method and application thereof
  • Up-conversion nanowire and preparation method and application thereof
  • Up-conversion nanowire and preparation method and application thereof

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Embodiment 1

[0031] A method for preparing upconversion nanowires, comprising the following steps:

[0032] Synthesis of K by co-precipitation 2 YF 5:18%Yb / 2%Er, that is, the molar ratio of Y:Yb:Er=0.8:0.18:0.02, 1.6mL yttrium acetate aqueous solution (0.2M, namely 0.2mol / L), 0.36mL ytterbium acetate aqueous solution (0.2M , ie 0.2mol / L) and 0.04mL erbium acetate aqueous solution (0.2M, ie 0.2mol / L) were added into a 50mL double-necked flask containing 1.5mL oleic acid, and the above mixed solution was stirred and heated in an oil bath, and the temperature was raised to 160 ℃. After all the water was removed, 12 mL of 1-octadecene was added and maintained for 1.25 hours, then the heating was stopped and cooled to room temperature 25°C with stirring. Mix 3.5mL KF methanol solution (0.5M, ie 0.5mol / L) with 3mL KOH methanol solution (0.5M, ie 0.5mol / L) and quickly add to the two-necked flask, heat to 50°C under stirring and keep half Hours, continue to heat up to 100 ° C, cross vacuum and...

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Abstract

The invention discloses an up-conversion nanowire and a preparation method and application thereof. According to the method, a coprecipitation method is used for the first time, the up-conversion nanowire K2YF5: 18% Yb/2% Er which is consistent in shape and uniform in size is prepared by regulating and controlling conditions such as oleic acid content, fluorine ion content and reaction time, and the up-conversion nanowire K2YF5: 18% Yb/2% Er has extremely strong luminescence under the excitation of near-infrared light. According to the method, rare earth element acetate is used as a precursorto prepare the up-conversion material, and the nanowire morphology can be regulated and controlled by regulating the oleic acid proportion, the fluorine ion concentration and the reaction time. The one-dimensional nanowire prepared by the technology has high flexibility, can be bent without breakage, has good ductility and stretchability, and can be applied to flexible optical devices and the like.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to an up-conversion nanowire and its preparation method and application. Background technique [0002] Due to its unique cascaded energy level structure, up-conversion materials can continuously absorb multiple long-wavelength photons and emit short-wavelength photons under the excitation of long-wavelength light sources, so they can convert low-energy long-wavelength near-infrared excitation light into high-energy energy of ultraviolet light or short-wavelength visible light. Among them, infrared light accounts for a high proportion of sunlight, and its penetrating ability is stronger than ultraviolet light and visible light. It can penetrate large volumes of wastewater and haze weather, so it has better application prospects in actual pollution control. [0003] Compared with bulk structures, one-dimensional nanostructures (such as nanowires, nanorods, and nanotubes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/85B82Y20/00B82Y40/00
CPCC09K11/7773B82Y20/00B82Y40/00
Inventor 王娟王嘉莹
Owner ZHEJIANG UNIV
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