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Method for increasing quantum yield of up-conversion nano material

A technology of quantum yield and nanomaterials, applied in the field of preparation of upconversion nanomaterials

Inactive Publication Date: 2015-03-25
SHANDONG NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods are not sufficient to convert NaYF 4 : The quantum yields of Yb and Er are greatly improved

Method used

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  • Method for increasing quantum yield of up-conversion nano material
  • Method for increasing quantum yield of up-conversion nano material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Weigh 0.195g YCl 3 (1mmol) solid was added to a 100mL three-necked flask, followed by 6mL oleic acid (OA) and 15mL 1-octadecene (ODE), magnetically stirred under vacuum and gradually heated to 100°C, kept for 10min, and removed from the solvent O 2 and water. The temperature was then raised to 150 °C and maintained for 30 min to form a homogeneous transparent yellow solution. After naturally cooling to room temperature, stop vacuuming, and add 10 mL of dissolved 0.1482 g (4 mmol) NH 4 CH of F and 0.1 g (2.5 mmol) NaOH 3 OH solution, heated to 100°C in air and maintained for 10min to remove methanol in the solvent. Then vacuum at this temperature for 10 min to remove O in the system 2 and water. after N 2 Under the protective atmosphere, the temperature was raised rapidly to 290° C., and the reaction was maintained at this temperature for 240 minutes. After the system was naturally cooled to room temperature, stop passing N 2 . The resulting sample was wash...

Embodiment 2

[0044] (1) Nuclear NaYF 4 The preparation is the same as in Example 1, except that the reaction temperature is 300°C, and the reaction is kept at this temperature for 120 minutes to obtain NaYF 4 , the shape is polyhedron, the particle size is about 20nm, and the yield is about 27%.

[0045] (2) Core-shell structure NaYF 4 NaYF 4 : Yb, the preparation of Er is the same as in Example 1, the difference is that the reaction temperature is 300°C, and the reaction is kept at this temperature for 60min to obtain NaYF 4 NaYF 4 : Yb, Er, polyhedral morphology, particle size about 22nm, yield about 8%.

[0046] (3) δ-doped NaYF 4 : Yb, the preparation of Er is the same as in Example 1, the difference is that the reaction temperature is 300°C, and the reaction is kept at this temperature for 60min to obtain NaYF 4 NaYF 4 :Yb,ErNaYF 4 , the shape is polyhedron, the particle size is about 25nm, and the yield is <5%.

Embodiment 3

[0048] (1) Nuclear NaYF 4 The preparation is the same as in Example 1, except that the reaction temperature is 310°C, and the reaction is kept at this temperature for 60 minutes to obtain NaYF 4 , the morphology is hexagonal sheet, the particle size is about 20nm, and the yield is about 32%.

[0049] (2) Core-shell structure NaYF 4 NaYF 4 : Yb, the preparation of Er is the same as in Example 1, except that the reaction temperature is 310°C, and the reaction is kept at this temperature for 30min to obtain NaYF 4 NaYF 4 : Yb, Er, the shape is hexagonal plate, the particle size is about 22nm, and the yield is about 24%.

[0050] (3) δ-doped NaYF 4 : Yb, the preparation of Er is the same as in Example 1, except that the reaction temperature is 310°C, and the reaction is kept at this temperature for 30min to obtain NaYF 4 NaYF 4 :Yb,ErNaYF 4 , the morphology is hexagonal sheet, the particle size is about 25nm, and the yield is about 17%.

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Abstract

The invention provides a method for increasing quantum yield of an up-conversion nano material. The method for increasing quantum yield of the up-conversion nano material comprises the following steps: (1) by taking YCl3, NH4F and NaOH as main raw materials, and taking oleic acid and 1-octadecene as solvents, reacting at a high temperature for 30-240 minutes, washing, centrifuging and drying to obtain a core NaYF4; (2) by taking the core NaYF4, LnCl3 (Ln represents Y, Yb and Er), NH4F and NaOH as main raw materials, and taking oleic acid and 1-octadecene as solvents, reacting at a high temperature for 10-60 minutes, washing, centrifuging and drying to obtain a core-shell structure NaYF4@NaYF4:Yb, Er; and (3) by taking the core-shell structure NaYF4@NaYF4:Yb, Er, YCl3, NH4F and NaOH as main raw materials, and taking oleic acid and 1-octadecene as solvents, reacting at a high temperature for 10-60 minutes, washing, centrifuging and drying to obtain a core-shell structure NaYF4@NaYF4:Yb, Er@NaYF4 which is delta-doped NaYF4:Yb, Er. By adopting the method, the quantum yield of the NaYF4:Yb, Er is greatly increased; the method has important significance for expanding application of the NaYF4:Yb, Er to biomarkers, analysis and detection, fluorescence imaging and solar cells.

Description

technical field [0001] The invention belongs to the field of preparation of up-conversion nanometer materials, in particular to a method for improving the quantum yield of upconversion nanometer materials. Background technique [0002] Up-conversion fluorescent materials doped with rare earth elements are widely used in biomarkers, analysis and detection, fluorescence imaging, solar cells, optical information storage and display, optical fiber communication technology and so on. Currently, NaYF 4 The research on the preparation and application of up-conversion fluorescent materials represented by :Yb and Er has become a hot spot in the world, and great progress has been made in biomarkers and fluorescence imaging. Nevertheless, NaYF 4 The low quantum yield of :Yb,Er limits its in-depth application and becomes the bottleneck of its wide application. Therefore, how to improve NaYF 4 : The quantum yield of Yb, Er has become the focus and difficulty of current research. Cur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/02C09K11/85
Inventor 李志华王亚南苗海霞张然刘玉香付颖杜宇
Owner SHANDONG NORMAL UNIV
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