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Treatment method for regulating and controlling morphology and particle size of oxysulfide fluorescent powder through laser irradiation

A technology of laser irradiation and sulfur oxides, applied in chemical instruments and methods, nano optics, luminescent materials, etc., can solve the problems of not being able to obtain pure, high-quality crystalline sulfur oxide phosphors, achieve enhanced luminescence performance, and avoid Effects of agglomeration and enhancement of fluorescence properties

Active Publication Date: 2021-10-22
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Regulating the morphology, size and crystalline quality of phosphors through reaction temperature, concentration and pH, etc., may introduce other impurities, so that pure, high crystalline quality sulfur oxide phosphors cannot be obtained.

Method used

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  • Treatment method for regulating and controlling morphology and particle size of oxysulfide fluorescent powder through laser irradiation
  • Treatment method for regulating and controlling morphology and particle size of oxysulfide fluorescent powder through laser irradiation
  • Treatment method for regulating and controlling morphology and particle size of oxysulfide fluorescent powder through laser irradiation

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Dissolve 0.724g of gadolinium oxide and 0.0374g of tetraterbium heptoxide in 1.95mL and 1mL of concentrated nitric acid respectively, stir at 45°C, add 15mL of ethylene glycol and 10mL of ethanol mixture, and then Slowly add 2gPVP. After the PVP was completely dissolved, 1.1 g of thiourea was dissolved in 10 mL of ethanol at 60° C. and added to the prepared solution. At this time, the acidity of the solution was very strong, and a 2mol / L NaOH solution was prepared and added thereto until the pH of the solution was 12. After magnetic stirring for 1 h, the solution was poured into a hydrothermal reaction kettle, and kept at 200° C. for 24 h. After the incubation, the solution was washed three times with ethanol and deionized water respectively. After washing, dry in a forced air drying oven at 60°C. Obtain the precursor; put the precursor into a crucible, and take another crucible filled with sublimed sulfur and place it at the air inlet of the tube furnace. The precu...

Embodiment 2

[0048] Take 0.452g of yttrium oxide and 0.0374g of tetrabium heptoxide and dissolve them in 1.95mL and 1mL of concentrated nitric acid respectively, and then prepare yttrium oxysulfide phosphor by the same method. Disperse the yttrium oxysulfide phosphor powder in ultrapure water to prepare a 1 mg / mL white suspension. The suspension was magnetically stirred at a rate of 500r / min, and while the suspension was magnetically stirred, a pulsed laser with a wavelength of 532nm, a pulse width of 8ns, a single pulse energy of 400mJ, and a pulse frequency of 10Hz was used to The fluorescent powder suspension was irradiated for 10 minutes, and then centrifuged at a speed of 10,000 rpm, and the precipitate obtained by centrifugation was washed three times with ultrapure water, and then dried in a blast drying oven at 60°C. Thus, the sulfur oxide cathodic ray phosphor whose morphology and size can be regulated by laser irradiation is obtained.

Embodiment 3

[0050] 0.838g of lutetium oxide and 0.0086g of cerium oxide were dissolved in 1.95mL and 1mL of concentrated nitric acid respectively, and then the lutetium oxysulfide phosphor was prepared by the same method. Disperse lutetium oxysulfide phosphor powder in ethylene glycol to prepare a 1 mg / mL white suspension. The suspension was magnetically stirred at a rate of 500r / min, and while the suspension was magnetically stirred, a pulsed laser with a wavelength of 532nm, a pulse width of 8ns, a single pulse energy of 400mJ, and a pulse frequency of 10Hz was used to The fluorescent powder suspension was irradiated for 10 minutes, and then centrifuged at a speed of 10,000 rpm, and the precipitate obtained by centrifugation was washed three times with ultrapure water, and then dried in a blast drying oven at 60°C. Thus, the sulfur oxide cathodic ray phosphor whose morphology and size can be regulated by laser irradiation is obtained.

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Abstract

The invention discloses a treatment method for regulating and controlling morphology and particle size of oxysulfide fluorescent powder through laser irradiation, and belongs to the field of photoelectric materials. A precursor is prepared by adopting a solvothermal method, and the magneton-shaped Gd2O2S: Tb single crystal fluorescent powder with high fluorescence property is prepared by calcining the precursor in a sulfur-containing atmosphere, and then irradiating suspended particles of the fluorescent powder by using laser, thereby regulating and controlling the morphology and the particle size of the fluorescent powder on the basis of ensuring the crystallization property. The method is characterized in that (1) the magneton-shaped Gd2O2S: Tb single crystal fluorescent powder is obtained through a solvothermal method and a calcination mode in a sulfur-containing atmosphere; and (2) non-focused laser is introduced, and laser irradiation is performed on the fluorescent powder suspended particles under a stirring condition. The fluorescent powder is irradiated by laser, the regulation and control process is efficient, rapid, green and environment-friendly, other impurities are not introduced, the size and morphology of the fluorescent powder are controllable, and the surface is free of ligand and high in modifiability.

Description

technical field [0001] The invention relates to the technical field of preparation of sulfur oxide cathode ray phosphors, in particular to a treatment method for regulating the morphology and particle size of sulfur oxide phosphors by laser irradiation. Background technique [0002] Sulfur oxide cathodic ray phosphors will generate mobile electrons and holes under the condition of high-speed electron excitation of the matrix lattice, and the combination of electrons and holes will generate excitons. When the excitons return from the excited state to radiative transition In the ground state, luminescence can be observed. At present, it is mainly used in televisions, oscilloscopes, electron microscopes, rare earth doped intensifying screens, up-conversion luminescence and other fields. The preparation of high-quality rare earth-doped sulfur oxide materials will have potential applications and important influences in many fields such as lighting, display, medical treatment, an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/84B82Y20/00B82Y40/00
CPCC09K11/7771B82Y20/00B82Y40/00
Inventor 李志鹏蒋鹏田文怀吕威
Owner UNIV OF SCI & TECH BEIJING
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