Cr<3+>-doped near-infrared nano fluorescent powder as well as preparation method and application thereof

A nano-phosphor and phosphor technology are applied in the field of near-infrared nano-phosphors doped with Cr3+ and their preparation, which can solve unfavorable encapsulation and propagation of ultraviolet excitation light, affect the conversion efficiency of near-infrared light, and are difficult to dope due to large size. Uniformity and other problems, to achieve the effect of easy industrial production, low price, low requirements for preparation equipment and conditions

Active Publication Date: 2021-12-31
宁波美成生物科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of Cr 3+ The preparation of doped phosphor requires solid-state reaction at a high temperature of 700-1500°C for 5-10 hours, which is time-consuming and energy-consuming; and the luminescent material produced is in the order of micromillimeters, so it is not easy to be uniformly doped when the size is large, and it is also difficult to It is not conducive to the propagation of encapsulation and ultraviolet excitation light, and affects the conversion efficiency of near-infrared light

Method used

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  • Cr&lt;3+&gt;-doped near-infrared nano fluorescent powder as well as preparation method and application thereof
  • Cr&lt;3+&gt;-doped near-infrared nano fluorescent powder as well as preparation method and application thereof
  • Cr&lt;3+&gt;-doped near-infrared nano fluorescent powder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] S1, choose Ga(NO 3 ) 3 , CrCl 3 , sodium hydroxide, sodium chloride, and water as raw materials, according to the phosphor chemical expression Ga 2-X o 3 :xCr 3+ The stoichiometric ratio of each chemical component in, weighed 1.99mmol Ga(NO 3 ) 3 , 0.01mmol CrCl 3 , 1mmol sodium hydroxide, 2mmol sodium chloride raw materials are mixed;

[0030] S2. Add 5 mL of water to the mixture obtained in step S1, grind for 15 minutes and mix well;

[0031] S3, vacuum drying the mixture obtained in step S2 for 20 minutes;

[0032] S4. Transfer the powder in step S3 to an alumina crucible, put it into a box furnace, and calcinate at 200° C. for 1 hour;

[0033] S5, after the mixture obtained in step S4 is cooled to room temperature, wash, dry and grind to obtain Ga 1.99 o 3 :0.01Cr 3+ Nano phosphor.

Embodiment 2

[0035] S1, choose Ga(NO 3 ) 3 , CrCl 3 , sodium hydroxide, sodium chloride, and water as raw materials, according to the phosphor chemical expression Ga 2-X o 3 :xCr 3+ The stoichiometric ratio of each chemical component in, weighed 1.6mmol Ga(NO 3 ) 3 , 0.4mmol CrCl 3 , 2mmol sodium hydroxide, 8mmol sodium chloride raw material mixing;

[0036] S2. Pour the mixture obtained in step S1 into 10 mL of water, grind for 15 minutes and mix well;

[0037] S3, vacuum drying the mixture obtained in step S2 for 20 minutes;

[0038] S4. Transfer the powder in step S3 to an alumina crucible, put it into a box furnace, and calcinate at 500° C. for 5 hours;

[0039] S5, after the mixture obtained in step S4 is cooled to room temperature, wash, dry and grind to obtain Ga 1.6 o 3 :0.4Cr 3 + Nano phosphor.

Embodiment 3

[0041] S1, choose GaCl 3 , Cr(NO 3 ) 3 , Potassium Hydroxide, Potassium Chloride, and Ethanol as raw materials, according to the chemical expression of phosphor powder Ga 2-X o 3 :xCr 3+The stoichiometric ratio of each chemical component in, weighed 1.55mmol Ga(NO 3 ) 3 , 0.45mmol CrCl 3 , 1.5mmol potassium hydroxide, 10mmol potassium chloride raw materials are mixed;

[0042] S2. Pour the mixture obtained in step S1 into 10 mL of ethanol, grind for 20 minutes and mix well;

[0043] S3, vacuum drying the mixture obtained in step S2 for 15 minutes;

[0044] S4. Transfer the powder in step S3 to an alumina crucible, put it into a box furnace, and calcinate at 300° C. for 3 hours;

[0045] S5, after the mixture obtained in step S4 is cooled to room temperature, wash, dry and grind to obtain Ga 1.55 o 3 :0.45Cr 3+ Nano phosphor.

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Abstract

The invention provides Cr<3+>-doped near-infrared nano fluorescent powder and a preparation method and application thereof. The chemical expression of the fluorescent powder is Ga2-XO3:xCr<3+>, wherein x is larger than 0 and smaller than 0.5. The fluorescent powder prepared through the preparation method is nano particles, matrix materials are easy to dope, and efficient conversion from blue-violet light to near-infrared light is achieved. The strongest excitation peak of the fluorescent powder is highly coupled with the strongest emission peak of a GaN LED, efficient emission of near-infrared light can be achieved under excitation of blue-violet light of a GaN LED chip, the requirement of a light source of a fresh food decay detection system is highly met, and the fluorescent powder can be applied to the field of nondestructive detection of fresh food.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a Cr-doped 3+ Near-infrared nano-phosphor powder and its preparation method and application. Background technique [0002] Fruits and vegetables provide the human body with rich vitamins and various minerals, and are an important source of nutrient intake that is indispensable in people's daily life. Fruits and vegetables are fresh products, which are not easy to preserve, easy to break, rot, and breed bacteria. People eating these spoiled fruits and vegetables can easily cause health problems. Therefore, people need a kind of method that can judge fresh product quality fast. [0003] In recent years, spectroscopic technology has been widely used in the field of food detection. Among them, the near-infrared spectroscopy technology mainly uses the absorption of electromagnetic waves in the wavelength range of 700-1500nm by the molecular vibration of plant organism...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/62G01N21/64
CPCC09K11/621G01N21/64Y02B20/00
Inventor 李岳彬陈道定张化梅万端阳潘海宗李根蔡倩
Owner 宁波美成生物科技有限公司
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