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Cr<3+> ion-activated near-infrared fluorescent powder, preparation method and application thereof

A phosphor and near-infrared technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of high melting point, luminescence quenching, poor stability, etc., and achieve the effects of simple synthesis process, high luminous efficiency, and low equipment requirements

Active Publication Date: 2020-04-07
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are many types of laser crystals in the prior art, among which metal oxide crystals are based on CaWO 4 Crystal-based laser crystals obtained by doping trivalent transition metal ions or trivalent rare earth ions, but they have the disadvantages of high melting point and difficulty in growing high-quality single crystals
However, rare earth organic complexes have weak near-infrared luminescence intensity and poor stability.
This is because the rare earth organic complex contains O-H and C-H. These two bonds have high-frequency vibrations, and it is easy to make the excited state non-radiative to the ground state, causing luminescence quenching, thereby greatly reducing the efficiency of near-infrared luminescence.

Method used

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  • Cr&lt;3+&gt; ion-activated near-infrared fluorescent powder, preparation method and application thereof
  • Cr&lt;3+&gt; ion-activated near-infrared fluorescent powder, preparation method and application thereof
  • Cr&lt;3+&gt; ion-activated near-infrared fluorescent powder, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] According to the chemical formula NaAl 0.95 Cr 0.05 VPO 7 , where x is Cr 3+ Doping instead of Al 3+ The molar ratio of 0.001≤x≤0.1. The sample of the present invention adopts the stoichiometric ratio of elements Na, Al, Cr, P and V, respectively weighs sodium carbonate Na 2 CO 3 : 0.530 g, aluminum oxide Al 2 o 3 : 0.484 g, chromium oxide Cr 2 o 3 : 0.038 g, ammonium metavanadate NH 4 VO 3 : 1.170 g, monoammonium phosphate NH 4 h 2 PO 4 : 1.150 g. Add acetone to the weighed raw materials for wet grinding, so as to mix evenly, and the obtained mixture is calcined for the first time under the air atmosphere, the calcining temperature is 300 ° C, and the calcining time is 1 hour; the calcined samples are ground evenly, and the calcined samples are Calcining for the second time, the calcination temperature is 750°C, and the calcination time is 4 hours to obtain a Cr 3+ Ion-activated near-infrared phosphors.

[0031] See attached figure 1 , is the X-ray po...

Embodiment 2

[0037] According to the chemical formula NaAl 0.999 Cr 0.001 VPO 7 , where x is Cr 3+ Doping instead of Al 3+ The molar ratio of 0.001≤x≤0.1. The sample of the present invention adopts the stoichiometric ratio of elements Na, Al, Cr, P and V, respectively weighs sodium hydroxide NaOH: 0.400 grams, aluminum oxide Al 2 o 3 : 0.509 g, chromium oxide Cr 2 o 3 : 0.076 g, vanadium pentoxide V 2 o 5 : 0.909 g, Phosphate H 3 PO 4 : 0.980 g. Mix the weighed raw materials and add acetone to carry out wet grinding, so as to mix evenly, and the obtained mixture is calcined for the first time under the air atmosphere, the calcining temperature is 400 ° C, and the calcining time is 3 hours; Calcining for the second time, the calcination temperature is 820°C, and the calcination time is 5 hours to obtain Cr 3+ Ion-activated near-infrared phosphors.

[0038] The structure, morphology, excitation spectrum, emission spectrum, and luminescence attenuation of the phosphor sample pre...

Embodiment 3

[0040] According to the chemical formula NaAl 0.9 Cr 0.1 VPO 7 , where x is Cr 3+ Doping instead of Al 3+ The molar ratio of 0.001≤x≤0.1. The sample of the present invention adopts the stoichiometric ratio of elements Na, Al, Cr, P and V, respectively weighs sodium sulfate Na 2 SO 4 : 0.710 g, aluminum hydroxide Al(OH) 3 : 0.702 grams, chromium nitrate Cr (NO 3 ) 3 9H 2 O: 0.400 g, vanadium pentoxide V 2 o 5 : 0.909 g, Phosphate H 3 PO 4 : 0.980 g. After mixing the weighed raw materials, add acetone for wet grinding, so as to mix uniformly, and the obtained mixture is calcined for the first time under air atmosphere, the calcining temperature is 450 ° C, and the calcining time is 3.5 hours; the calcined samples are ground evenly, and the The second calcination under air atmosphere, the calcination temperature is 800 ℃, and the calcination time is 6 hours, to obtain a Cr 3+ Ion-activated near-infrared phosphors.

[0041] The structure, morphology, excitation spe...

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Abstract

Belonging to the technical field of inorganic fluorescent powder materials, the invention relates to a Cr<3+> ion-activated near-infrared fluorescent powder, a preparation method and application thereof. The chemical formula of the Cr<3+> ion-activated near-infrared fluorescent powder is NaAl1-xCrxVPO7, wherein x is the molar ratio of Cr<3+> doping substituted Al<3>, and x is greater than or equalto 0.001 and less than or equal to 0.1. The preparation method includes: according to the stoichiometric ratio of each element in the chemical formula NaAl1-xCrxVPO7, weighing compounds containing ions of the elements, respectively carrying out wet grinding on the weighed raw materials with acetone as a grinding aid, mixing the substances uniformly, and then conducting calcining for two times tofinish preparation. The synthesis method has the characteristics of simple process, convenient operation, low equipment requirement, energy-saving and environmental friendliness, and the prepared powder has high luminous efficiency and good stability. After ultraviolet excitation, the fluorescent powder can emit red light of about 703 nanometers, the Cr<3+> ion-activated fluorescent powder can beapplied to near-infrared lasers, and provides more material choices are provided for solid-state lasers.

Description

technical field [0001] The invention relates to the technical field of inorganic fluorescent materials, specifically a Cr 3+ Ion-activated near-infrared phosphor and its preparation method and application. Background technique [0002] The progress of society is inseparable from the development of science and technology, and the invention and application of lasers is a big step forward for human civilization. In 1960, Maiman made the first ruby ​​laser, declaring that laser technology has officially entered the stage of human history. Today, lasers have been widely used in various fields, especially in industry, commerce, medical care, information, scientific research, Military and other fields, and play an irreplaceable role. With the rapid development of laser technology, it has also combined with many disciplines to form a large number of new technical fields and disciplines, which has greatly promoted the development of various new and old industries. [0003] It is w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/70
CPCC09K11/70
Inventor 乔学斌许臣臣王胜家王艳丽
Owner XUZHOU NORMAL UNIVERSITY
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