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a mn 4+ Activated dark red fluorescent material for plant growth LED lamp and preparation method thereof

A technology of fluorescent materials and LED lamps is applied in the directions of luminescent materials, chemical instruments and methods, light sources, etc., to achieve the effects of promoting plant growth, cheap and easy-to-obtain raw materials, and simple and easy preparation methods.

Inactive Publication Date: 2021-07-16
SHAANXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, the reported Mn 4+ Ion-activated red phosphors are rarely used in LED plant growth lamps. Most of these studies are aimed at fluorescent materials for white LEDs. Therefore, in order to obtain red LED lamps suitable for the light source required for plant growth, research on Mn 4+ Ion-doped red phosphor powder for new plant growth LED lights is of great significance

Method used

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  • a mn <sup>4+</sup> Activated dark red fluorescent material for plant growth LED lamp and preparation method thereof
  • a mn <sup>4+</sup> Activated dark red fluorescent material for plant growth LED lamp and preparation method thereof
  • a mn <sup>4+</sup> Activated dark red fluorescent material for plant growth LED lamp and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] According to SrLa 2 sc 1.96 o 7 :0.02Mn 4+ 0.02Mg 2+ The stoichiometric ratio, weigh 1.0334g SrCO 3 , 2.2807gLa 2 o 3 , 0.9268g Sc 2 o 3 and 0.0122g MnO 2 , 0.0056g MgO, mix the weighed material evenly and grind it in an agate mortar for 30 minutes, put the ground powder into a corundum crucible, then put the corundum crucible in a muffle furnace, and heat it in an air atmosphere at 8°C The heating rate per minute was raised to 1000°C for 2 hours, and then the temperature was raised to 1600°C at a heating rate of 12°C / min for 5 hours. 4+ Deep red fluorescent material SrLa for activated plant growth LED lights 2 sc 2 o 7 :0.02Mn 4+ .

[0024] The obtained fluorescent material adopts the Rigaku mini flex 6000 type X-ray powder diffractometer produced by Rigaku Co., Ltd. to carry out phase analysis on the product (test conditions are: CuKα radiation, voltage is 40KV, current is 15mA, and the scanning range is 10 ° ~ 80 ° , the scanning speed is 10° / min, and ...

Embodiment 2

[0026] In this example, the temperature was raised to 1000°C for 2 hours at a heating rate of 7°C / min in an air atmosphere, and then the temperature was raised to 1550°C at a heating rate of 12°C / min for 6 hours, and the other steps were the same as in Example 1 to obtain mn 4+ Deep red fluorescent material SrLa for activated plant growth LED lights 2 sc 2 o 7 :0.02Mn 4+ .

[0027] Depend on Figure 5 It can be seen that the obtained fluorescent materials have excitation peaks at 363 and 514nm respectively in the range of 200-600nm, wherein the excitation peak at 363nm matches the current commercial (near) ultraviolet chip, and the excitation peak at 514nm matches the current commercial green light chip Matching; the fluorescent material can produce deep red fluorescence with a peak at about 690nm under excitation at about 363 and 514nm, and the fluorescence covers the spectral region of 650-750nm; Figure 6 Is deep red phosphor SrLa 2 sc 2 o 7 :Mn 4+ The fluorescenc...

Embodiment 3

[0029] According to SrLa 2 sc 1.94 o 7 :0.03Mn 4+ 0.03Mg 2+ The stoichiometric ratio, weigh 1.0334g SrCO 3 , 2.2807gLa 2 o 3 , 0.9075g Sc 2 o 3 and 0.0182g MnO 2 , 0.0085g MgO, mix the weighed material evenly and grind it in an agate mortar for 30 minutes, put the ground powder into a corundum crucible, then put the corundum crucible in a muffle furnace, and heat it in an air atmosphere at 5°C The heating rate per minute was raised to 1000°C for 2 hours, and then the temperature was raised to 1550°C at a rate of 10°C / min for 6 hours. 4+ Deep red fluorescent material SrLa for activated plant growth LED lights 2 sc 2 o 7 :0.03Mn 4+ .

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Abstract

The invention discloses a Mn 4+ Activated dark red fluorescent material for plant growth LED lamp and preparation method thereof, the molecular formula of the fluorescent material is SrLa 2 sc 2 o 7 :xMn 4+ , where 0.001≤x≤0.04, SrLa 2 sc 2 o 7 The crystal structure is orthorhombic, the space group is Fmmm, and the unit cell parameter is the unit cell volume. The preparation method is as follows: SrCO 3 , La 2 o 3 、Sc 2 o 3 , MnO 2 , MgO ground and mixed, pre-fired and roasted in the air atmosphere to get the fluorescent material. The fluorescent material of the invention has an excitation band of 250-600nm and a deep red emission band of 650-750nm, and can be applied to plant growth LED lamps. In addition, the preparation method of the fluorescent material is simple and easy, the raw material price is low, and it is suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a novel oxide phosphor, in particular to a tetravalent manganese ion-doped scandate deep red phosphor for a novel plant growth LED lamp and a preparation method thereof. Background technique [0002] The growth and development of plants can be controlled by adjusting the light environment. It is an important technology in the field of protected cultivation to control the morphological establishment of plants through light quality adjustment. 400-500nm (blue light), 620-690nm (red light), 700-1050nm (far-red light and near-infrared light) respectively correspond to the photosynthetic pigments (chlorophyll a, b and carotene), phytochrome and bacterial chlorophyll in plants. absorb light. Among them, plants mainly use chlorophyll to absorb light of 400-500nm (blue light) and 620-690nm (red light) for photosynthesis, that is, light with a wavelength of abou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78F21K9/00
CPCC09K11/7768F21K9/00
Inventor 焦桓王晓明张羽玺王翠平
Owner SHAANXI NORMAL UNIV
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