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A kind of far-red and near-infrared emitting fluoride fluorescent material and its preparation and application

A fluorescent material and near-infrared technology, applied in the directions of luminescent materials, chemical instruments and methods, semiconductor devices, etc., can solve the problems of low plant efficiency, lack of far-red light and near-infrared light, and inability to adjust the proportion of light, and achieve the preparation method. Simple, wide-ranging, and easy-to-operate effects

Active Publication Date: 2022-03-08
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, traditional light sources such as fluorescent lamps, metal halide lamps, high-pressure sodium lamps, and incandescent lamps are mainly used as plant growth lights for indoor planting. The spectrum of these light sources is continuous composite light, and the ratio of various types of light cannot be adjusted. There is a general lack of far-red light and near-infrared light of 700-950nm, so it does not match the light needed for plant growth, resulting in low efficiency in promoting plant growth

Method used

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  • A kind of far-red and near-infrared emitting fluoride fluorescent material and its preparation and application
  • A kind of far-red and near-infrared emitting fluoride fluorescent material and its preparation and application
  • A kind of far-red and near-infrared emitting fluoride fluorescent material and its preparation and application

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Effect test

Embodiment 1

[0032] A far-red and near-infrared emitting fluoride fluorescent material, the chemical expression of the fluorescent material is K 3 al 0.98 f 6 : 0.02Cr, its preparation steps are as follows:

[0033] 1. Weigh the raw material KF·2H 2 O 0.03mol, AlF 3 ·3H 2 O 0.0098mol, CrF 3 0.0002mol, weigh 20% of the total weight of raw materials NH 4 F;

[0034] 2. After fully mixing the weighed raw materials, sinter at 750°C for 3 hours in an argon atmosphere to obtain a roasted product;

[0035] 3. After fully grinding the obtained roasted product into powder and passing through a 200-mesh sieve, washing with deionized water for 3 times, and drying at 80°C, the K 3 al 0.98 f 6 : 0.02Cr phosphor.

[0036] The excitation spectrum and emission spectrum of the far-red and near-infrared emitting fluoride fluorescent materials obtained in this embodiment are as follows: figure 1 shown.

[0037] An application of a far-red and near-infrared emitting fluoride fluorescent material...

Embodiment 2

[0039] A far-red and near-infrared emitting fluoride-based fluorescent material, the chemical expression of the fluorescent material is Na 3 al 0.96 f 6 : 0.04Cr, its preparation steps are as follows:

[0040] 1. Weigh 0.03mol of raw materials NaF, AlF 3 ·3H 2 O 0.0096mol, CrF 3 0.0004mol, weigh 20% of the total weight of raw material NH 4 F;

[0041] 2. After fully mixing the weighed raw materials, sinter at 700°C for 2 hours in an argon atmosphere to obtain a roasted product;

[0042] 3. After the roasted product is ground into powder and passed through a 200 mesh sieve, it is washed 3 times with deionized water and dried at 100°C to obtain the Na 3 al 0.96 f 6 : 0.04Cr phosphor.

[0043] The excitation and emission spectra of the far-red and near-infrared emitting fluoride fluorescent materials obtained in this embodiment are shown in the attached figure 2 , 3 shown.

[0044] An application of a far-red and near-infrared emitting fluoride fluorescent material...

Embodiment 3

[0046] A far-red and near-infrared emitting fluoride-based fluorescent material, the chemical expression of the fluorescent material is Na 2.5 Li 0.5 al 0.98 f 6: 0.02Cr, its preparation steps are as follows:

[0047] 1. Weigh raw materials NaF 0.025mol, LiF 0.005mol, AlF 3 ·3H 2 O 0.0098mol, CrF 3 0.0002mol, weigh 30% of the total weight of raw materials NH 4 F;

[0048] 2. After fully mixing the weighed raw materials, sinter at 720°C for 5 hours in an argon atmosphere to obtain a roasted product;

[0049] 3. After the roasted product is ground into powder and passed through a 200 mesh sieve, it is washed 3 times with deionized water and dried at 100°C to obtain the Na 2.5 Li 0.5 al 0.98 f 6 : 0.02Cr phosphor.

[0050] The excitation and emission spectra of the far-red and near-infrared emitting fluoride fluorescent materials obtained in this embodiment are shown in the attached image 3 , 4 shown.

[0051] An application of a far-red and near-infrared emitting...

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Abstract

The invention discloses a far-red and near-infrared emitting fluoride fluorescent material and its preparation and application. The chemical expression of the fluorescent powder material is R x Al 1‑y F x+3 : yCr; wherein R is at least one of Li, Na, K, Rb or Cs, 1≤x≤3, 0.005≤y≤0.2. The preparation method is as follows: 1) Weigh AlF according to the chemical composition and stoichiometric ratio of the fluorescent material 3 , CrF 3 , R-containing fluoride and NH 4 F; 2) Fully grind and mix the weighed raw materials evenly, and then burn at high temperature to obtain a roasted product; 3) Grind the roasted product into powder, wash and centrifuge, then dry to obtain the fluorescent material. The fluorescent material has stable chemical properties and excellent luminous performance, can be excited by blue or red LED chips, and has simple preparation and operation, no pollution, and low cost. type LED devices.

Description

technical field [0001] The invention relates to a far-red and near-infrared emitting fluoride fluorescent material and its preparation and application, belonging to the technical field of solid luminescent materials. Background technique [0002] Photosynthesis is one of the essential conditions for plant growth and development. Studies have shown that the absorption spectrum of green plants to visible light is basically the same, mainly concentrated in the purple-blue region of 400-500nm and the red-light region of 600nm-800nm. Blue light can promote the growth of stems and leaves, and red light can regulate the flowering cycle. Therefore, blue light and red light Light plays an important role in the growth, development and flowering of plants. Economic crops such as vegetables and flowers in the greenhouse are significantly affected by seasons and bad weather. Insufficient light has an important slowing effect on their growth, which requires a certain amount of light as a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/68H01L33/50
Inventor 邵起越彭瑾丁浩董岩蒋建清
Owner SOUTHEAST UNIV
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