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A kind of red fluorescent material for plant growth LED lamp and preparation method thereof

A technology of red fluorescent and LED lamps, which is applied in the field of red fluorescent materials, can solve the problems such as the unsatisfactory applicability of ion-doped red fluorescent powder, achieve good thermal quenching resistance, simple and easy preparation method, and high fluorescence intensity and The effect of small fluorescence lifetime

Inactive Publication Date: 2017-09-05
JINGGANGSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the reported Mn 4+ The practical application of ion-doped red phosphors in LED plant growth lamps is not very ideal, so in order to obtain qualified red LED lights for plant growth, research on new Mn 4+ Ion-doped red phosphors have special significance

Method used

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  • A kind of red fluorescent material for plant growth LED lamp and preparation method thereof
  • A kind of red fluorescent material for plant growth LED lamp and preparation method thereof
  • A kind of red fluorescent material for plant growth LED lamp and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Select lithium-containing compound raw materials, gallium-containing compound raw materials, titanium-containing compound raw materials, and manganese-containing compound raw materials as starting materials, according to the element molar ratio Li: Ga: Ti: Mn = 1: 1: (1-x) : X, weigh the four raw materials accurately, and x respectively take 0.001, 0.002, 0.004, 0.006, 0.008, 0.01, 0.12, 0.02, 0.04, 0.06, 0.08, 0.1. Weigh four chemical raw materials, lithium carbonate, gallium oxide, titanium dioxide and manganese dioxide, respectively, and control the total weight of the mixture to about 20 grams. After mixing 20 grams of the mixture by ball milling, it is put into the corundum crucible, and then the crucible is put into the high-temperature electric furnace. Accurately control the heating rate, control the decomposition reaction speed of the compound raw materials, and prevent the mixture from overflowing from the crucible. The sample is pre-fired at 450°C for 9 hours....

Embodiment 2

[0034] Choose lithium oxide, gallium carbonate, titanium nitrate, and manganese carbonate chemicals as starting materials, according to the element molar ratio Li: Ga: Ti: Mn = 1: 1: (1-x): x, weigh the four raw materials accurately , Where 0.001 ≤ x ≤ 0.1. Control the total weight of the mixture to about 20 grams. After mixing 20 grams of the mixture by ball milling, it is put into the corundum crucible, and then the crucible is put into the high-temperature electric furnace. Accurately control the heating rate, control the decomposition reaction speed of the compound raw materials, and prevent the mixture from overflowing from the crucible. The sample is pre-fired at 500°C for 8 hours. Take out the pre-fired sample, grind and mix it again, put it in a crucible, burn it at 1050°C for 6 hours, and cool it down to room temperature with the furnace to obtain a new type of tetravalent manganese ion doped lithium gallium titanate red fluorescent material (LiGaTiO 4 :Mn 4+ ). X-ra...

Embodiment 3

[0036] Choose lithium nitrate, gallium chloride, titanium dioxide, and manganese carbonate as starting materials. According to the element molar ratio Li: Ga: Ti: Mn = 1: 1: (1-x): x, weigh the four raw materials accurately. , Where 0.001 ≤ x ≤ 0.1, control the total weight of the mixture to about 20 grams. After mixing 20 grams of the mixture by ball milling, it is put into the corundum crucible, and then the crucible is put into the high-temperature electric furnace. Accurately control the heating rate, control the decomposition reaction speed of the compound raw materials, and prevent the mixture from overflowing from the crucible. The sample is pre-fired at 400°C for 10 hours. Take out the pre-fired sample, grind and mix it again, put it in a crucible, burn it at 1000°C for 8 hours, and cool it down to room temperature with the furnace, then a new tetravalent manganese ion doped lithium gallium titanate red fluorescent material (LiGaTiO 4 :Mn 4+ ). X-ray diffraction analys...

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Abstract

The invention provides a red fluorescent material for LED lamps for plant growth and a preparation method of the red fluorescent material. The red fluorescent material is made from tetravalent manganese ion doped lithium gallium titanate and has the chemical formula as follows: LiGaTiO4:Mn<4+>, wherein the ratio of Li to Ga to Ti to Mn is 1:1:(1-x):x, and x is larger than or equal to 0.001 and smaller than or equal to 0.1. The preparation method comprises steps as follows: a raw material containing a lithium compound, a raw material containing a gallium compound, a raw material containing a titanium compound and a raw material containing a manganese compound are weighed accurately, ground, mixed uniformly and pre-sintered at the controlled temperature of 450-600 DEG C for 3-10 hours; a pre-sintered sample is taken out, ground again, mixed uniformly and sintered at the controlled high temperature of 900-1,100 DEG C for 5-10 hours; then the mixture is cooled to the room temperature with a furnace, and tetravalent manganese ion doped lithium gallium titanate is prepared. The red fluorescent material has wide ultraviolet and blue light absorption, can convert ultraviolet and blue light into red light in the spectral region of 600-780 nm efficiently and can be applied to white-light LED lighting and the red LED lamps for plant growth, and the luminescence center is 668 nm.

Description

Technical field [0001] The invention relates to the field of red fluorescent materials, in particular to a tetravalent manganese ion doped lithium gallium titanate red fluorescent material for plant growth LED lamps and a preparation method thereof. Background technique [0002] Light environment is one of the important physical environmental factors indispensable for plant growth and development. Through light quality regulation, controlling plant morphology is an important technology in the field of facility cultivation. Plant photosynthesis requires light with a wavelength of about 400 ~ 720nm, mainly through chlorophyll absorption of 440 ~ 480nm (blue) and 640 ~ 680nm (red) for photosynthesis. LED lights have many characteristics that are different from other electric light sources (energy saving, environmental protection, non-toxic, long life, etc.), which can fully meet the requirements of plant growth for red light. For example: (1) Red light can promote the rooting of ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/67
CPCC09K11/671
Inventor 曹人平黄及军曾祥峰张金龙罗小兵罗志扬
Owner JINGGANGSHAN UNIVERSITY
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