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Near-infrared fluorescent powder, preparation method thereof and light-emitting device for supplementing light to pitaya

A technology of light-emitting device and red-light phosphor, which is applied in the fields of botanical equipment and methods, light-emitting materials, gardening methods, etc., can solve the problems of low luminous efficiency and reduced luminous efficiency, etc.

Active Publication Date: 2021-09-07
SOUTH CHINA AGRI UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the Chinese invention patent of 201910022825.6 has a narrow half-peak width, and the absorption efficiency of plant far-red light-absorbing phytochrome needs to be further improved; but other existing Cr 3+ Infrared phosphors that are luminescent centers generally pursue the maximization of half-peak width, which will lead to low luminous efficiency
Most importantly, Cr 3+ It is almost necessary to calcine in a reducing atmosphere while maintaining trivalent chromium ions Cr 3+ The valence state is stable, but some trivalent chromium ions Cr 3+ is still reduced to tetravalent chromium ion Cr 4+ , will further reduce the luminous efficiency in the range of 700-800nm

Method used

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  • Near-infrared fluorescent powder, preparation method thereof and light-emitting device for supplementing light to pitaya
  • Near-infrared fluorescent powder, preparation method thereof and light-emitting device for supplementing light to pitaya
  • Near-infrared fluorescent powder, preparation method thereof and light-emitting device for supplementing light to pitaya

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preparation example Construction

[0038] The preparation method of described near-infrared fluorescent powder comprises the following steps:

[0039] S1: According to the general chemical formula (Lu, Gd) 3 (Ga,Al) 5 o 12 :xCr 3+ ,yH 3 BO 3 The stoichiometric ratio of raw materials is weighed, and ground and mixed to obtain a raw material mixture;

[0040] S2: Calcining the raw material mixture in air or a reducing atmosphere to obtain a calcined body;

[0041] S3: Grinding the calcined body into powder to obtain the near-infrared fluorescent powder.

[0042] In the preparation method, the raw material includes elemental lutetium or a compound containing lutetium, elemental gadolinium or a compound containing gadolinium, elemental gallium or a compound containing gallium, elemental aluminum or a compound containing aluminum, elemental chromium or a compound containing chromium.

[0043] Specifically, the lutetium-containing compound may be a lutetium-containing oxide, hydroxide, carbonate, nitrate, hali...

Embodiment 1

[0054] A kind of near-infrared fluorescent powder, its general chemical formula is (Lu, Gd) 3 (Ga,Al) 5 o 12 :xCr 3+ ,yH 3 BO 3 , where x=0.13, y=0.

[0055] The preparation method of this near-infrared fluorescent powder is as follows:

[0056] According to the stoichiometric ratio of each element in the chemical formula, accurately weigh Lu 2 o 3 , Gd 2 o 3 , Ga 2 o 3 , Al 2 o 3 , Cr 2 o 3 , H 3 BO 3 High-purity powder raw materials are placed in an agate mortar and ground for about 20 minutes to fully mix the raw materials evenly. The mixed raw materials were transferred to a corundum crucible, placed in an air high-temperature muffle furnace for calcination at 1350°C for 5 hours, cooled naturally, taken out, and ground again for about 10 minutes to obtain (Lu,Gd) 3 (Ga,Al) 5 o 12 :0.13Cr 3+ Phosphor powder, its XRD pattern is attached figure 1 shown by figure 1 It can be known that the near-infrared phosphor is a single pure phase. The emission spec...

Embodiment 2

[0058] A kind of near-infrared fluorescent powder, its general chemical formula is (Lu, Gd) 3 (Ga,Al) 5 o 12 :xCr 3+ ,yH 3 BO 3 , where x=0.13, y=0.03.

[0059] The preparation method of this near-infrared fluorescent powder is as follows:

[0060] According to the stoichiometric ratio of each element in the chemical formula, accurately weigh Lu 2 o 3 , Gd 2 o 3 , Ga 2 o 3 , Al 2 o 3 , Cr 2 o 3 , H 3 BO 3 The high-purity powder raw material is placed in an agate mortar and ground for about 20 minutes, so that the raw material is fully mixed and even. Transfer the mixed raw materials to a corundum crucible, place it in an air-filled high-temperature tube furnace and calcinate at 1350°C for 5 hours, take it out after natural cooling, and grind it again for about 10 minutes to obtain (Lu,Gd) 3 (Ga,Al) 5 o 12 :0.13Cr 3+ ,0.03H 3 BO 3 Phosphor powder, its XRD pattern is as follows figure 2 As shown, it can be seen that besides the original garnet main phase...

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Abstract

The invention discloses near-infrared fluorescent powder, the chemical general formula of which is (Lu, Gd) 3 (Ga, Al) 5O12: xCr < 3 + >, yH3BO3, wherein 0.01 < = x < = 0.2, 0 < = y < = 0.04, and Cr < 3 + > is a luminescence center. The invention also discloses a preparation method of the near-infrared fluorescent powder and a light-emitting device for supplementing light to pitaya. The near-infrared fluorescent powder is high in quantum efficiency, good in thermal quenching property and good in chemical and physical stability, and the emission spectrum half-peak width is perfectly compounded with the absorption band of plant phytochrome. When used in the light-emitting device, the near-infrared fluorescent powder can provide far-red light illumination for plants, can accelerate photosynthesis of pitaya in a weak light stage, can shorten the vegetative growth cycle of pitaya, and has a good flower forcing effect on pitaya. The near-infrared fluorescent powder can also be used in the fields of laser illumination and the like.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a near-infrared fluorescent powder, a preparation method thereof, and a luminescent device for supplementing light of pitaya. Background technique [0002] Light is an indispensable energy in the process of plant growth. It can shorten the vegetative growth cycle of plants, regulate the flowering and fruiting stages, improve the quality of fruits, and increase the output of agricultural products by supplementing light. Therefore, plant lighting technology has been widely used in the production fields of flowers, fruits, vegetables and so on. In order to meet the high-efficiency and high-quality production of crops, a variety of artificial light sources have been developed and utilized. The more common traditional ones are incandescent lamps, high pressure sodium lamps, fluorescent lamps, metal halide lamps, etc. These kinds of plant lights are used in different fi...

Claims

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Application Information

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IPC IPC(8): C09K11/80H01L33/50A01G7/04
CPCC09K11/7776C09K11/778H01L33/502A01G7/04Y02P60/14
Inventor 雷炳富邹西坤陈士伟吴如慧李栋宇张正贺张浩然张学杰刘应亮杨暹
Owner SOUTH CHINA AGRI UNIV
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