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Up-conversion fluorescent powder capable of remarkably enhancing visible light and preparation method of up-conversion fluorescent powder

A fluorescent powder and visible light technology, applied in chemical instruments and methods, luminescent materials, etc., to achieve the effects of low production cost, significant enhancement of visible light, and low preparation cost

Pending Publication Date: 2022-03-22
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Up-conversion fluorescent powder capable of remarkably enhancing visible light and preparation method of up-conversion fluorescent powder
  • Up-conversion fluorescent powder capable of remarkably enhancing visible light and preparation method of up-conversion fluorescent powder

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Embodiment 1

[0031] A method for preparing an up-conversion phosphor significantly enhanced by visible light, specifically comprising the following steps:

[0032] S1. Add 1 ml of 4mol·L -1 Sodium hydroxide solution and 1.5 ml of 2mol L -1 Mix the citric acid solution with 10 ml of distilled water, and after stirring for 10 minutes, add 0.393 ml of 1mol·L -1 Yttrium chloride, 0.2ml 0.5mol·L -1 Ytterbium chloride, 0.05ml 0.1mol·L -1 Thulium chloride and 0.025 ml of 0.1mol L -1 Holmium chloride, after stirring for 30 minutes, add 1mol·L -1 Lithium nitrate solution and 2mol L -1 The mixed solution of ammonium bifluoride solution continued to stir for 10 to 15 minutes, and finally added 1mol L -1 Sodium fluoride solution, and 7.332 ml of distilled water were added, and stirred for 30 minutes to form a white colloidal suspension.

[0033] S2. Transfer the white colloidal suspension to a 50 ml stainless steel reaction kettle, package it and put it into an oven for hydrothermal reaction at...

Embodiment 2

[0037] Preparation of Hexagonal NaYF by Hydrothermal Method 4 : 20%Yb / 1%Tm / 0.5%Ho / xLi (x=0,5,8,12,15,18%) crystal, specifically comprising the following steps:

[0038] S1. Add 1 ml of 4mol·L -1 Sodium hydroxide solution and 1.5 ml of 2mol L -1 Mix the citric acid solution with 10 ml of distilled water, and after stirring for 10 minutes, add 0.393 ml of 1mol·L -1 Yttrium chloride, 0.2ml 0.5mol·L -1 Ytterbium chloride, 0.05ml 0.1mol·L -1 Thulium chloride and 0.025 ml of 0.1mol L -1 Holmium chloride, after fully stirring for 30 minutes, add (0ml / 0.25ml / 0.4ml / 0.6ml / 0.75ml / 0.9ml) 1mol L -1 Lithium nitrate solution, (0ml / 0.125ml / 0.2ml / 0.3ml / 0.375ml / 0.45ml) 2mol L -1 The mixed solution of ammonium bifluoride solution continued to stir for 10-15 minutes, and finally added (5ml / 4.625ml / 4.4ml / 4.1ml / 3.875ml / 3.65ml) 1mol L -1 Sodium fluoride solution, and 7.332 ml of distilled water were added, and stirred for 30 minutes to form a white colloidal suspension.

[0039] S2. Transfer...

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Abstract

The invention discloses up-conversion fluorescent powder capable of remarkably enhancing visible light and a preparation method of the up-conversion fluorescent powder, the chemical formula of the up-conversion fluorescent powder is NaYF4: 20% Yb / 1% Tm / 0.5% Ho / xLi, and x is equal to 0-18%. The hexagonal phase NaYF4 up-conversion fluorescent powder prepared by the invention has the advantages that the visible light is obviously enhanced, and the preparation cost is low. According to the invention, distilled water is used as a solvent, citric acid is used as a chelating agent, sodium hydroxide is used for adjusting the pH value of the solution, and the up-conversion fluorescent powder with remarkably enhanced visible light is prepared through a hydrothermal reaction, and the up-conversion fluorescent powder is simple in preparation process, high in repeatability, low in production cost, free of pollution and capable of being produced on a large scale. Certain technical parameters in the method can also be popularized to other preparation methods, and the obtained material has remarkably enhanced visible light and has huge application value in the fields of light emitting diodes, advanced display technologies, solar cells and the like.

Description

technical field [0001] The invention relates to the field of luminescent materials, in particular to an up-conversion fluorescent powder with significantly enhanced visible light and a preparation method thereof. Background technique [0002] Infrared-to-visible up-conversion material is a new type of functional material that can change invisible infrared light into visible light. It can be excited by photons with small energy (usually 980nm) to emit photons with large energy. Trivalent lanthanide-doped upconversion luminescent materials have attracted much attention for their potential applications in biomedicine, light-emitting diodes, solar cells, optoelectronic devices, biosensors, fingerprint detection, fluorescent encoding, advanced displays, and solid-state lighting. At present, the low luminous efficiency of upconversion materials is an important factor restricting their practical applications. The development of new up-conversion luminescent materials and the acqui...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/85
CPCC09K11/7773
Inventor 林浩郑雪刚潘书生陈滢葛军刘志宇
Owner GUANGZHOU UNIVERSITY
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