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Dark red fluorescent powder for plant growth lamp and preparation method thereof

A technology of plant growth lamps and phosphors, applied in botany equipment and methods, chemical instruments and methods, and optical elements used to change the spectral characteristics of emitted light, etc., can solve the problem of difficult control of crystal distribution, type and depth, etc. problem, achieve the effect of low cost, simple preparation process and low cost

Pending Publication Date: 2021-02-26
XINYI XIYI ADVANCED MATERIALS RES INST OF IND TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defect modification method is also a hot spot in the field of luminescent materials, but it is difficult to control the crystal distribution, type and depth

Method used

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  • Dark red fluorescent powder for plant growth lamp and preparation method thereof
  • Dark red fluorescent powder for plant growth lamp and preparation method thereof
  • Dark red fluorescent powder for plant growth lamp and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Li 2 MTi(1- x - y )O 4 : x mn 4+ , y Ga 3+

[0030] According to Li 2 MTi(1- x - y )O 4 : x mn 4+ , y Ga 3+ ( x =0, 0.2%, 0.4%, 0.6%, 0.8%, 1.0%; y =0,0.1, 0.2, 0.3, 0.4, 0.5) stoichiometric ratio, weigh Li 2 CO 3 (AR), TiO 2 (AR), MgO (AR), ZnO(AR), MnO 2 (AR), Ga 2 o 3 (AR) were mixed, and another 5 mol% Li was weighed 2 CO 3 Compensation for Li ions evaporated at high temperature. The obtained mixed product was placed in an agate mortar, 5 mg of absolute ethanol was added, and then ground for 20-50 min until the mixture was uniform. Then the obtained sample powder was placed in a quartz crucible, heated at 6°C / min to 600-800°C for preheating for 6 h, then cooled to room temperature naturally, grinded again to improve uniformity, and then continued to be heated to 1100°C in an air environment. ~1300 °C for 2 h, then cooled to room temperature naturally. Finally, the obtained solid sample was ground again in an agate mortar to obta...

Embodiment 2

[0032] Example 2: Li 2 MgTiO 4 : Mn 4+ , Ga 3+ , BaF 2

[0033] According to Li 2 MgTi(1- x - y )O 4 : x mn 4+ , y Ga 3+ ( x =0, 0.2%, 0.4%, 0.6%, 0.8%, 1.0%; y =0,0.1, 0.2, 0.3, 0.4, 0.5) stoichiometric ratio, weigh Li 2 CO 3 (AR), TiO 2 (AR), MgO (AR), ZnO(AR), MnO 2 (AR), Ga 2 o 3 (AR) mixed, and weighed 5mol% Li 2 CO 3 Compensation for Li ions evaporated at high temperature. Then weigh an appropriate amount of 1.0~3.0wt% flux BaF 2 . The obtained mixed product was placed in an agate mortar, 5 mg of absolute ethanol was added, and then ground for 30 min until the mixture was homogeneous. Then the obtained sample powder was placed in a quartz crucible, heated to 600 °C at 6 °C / min for preheating for 6 h, then cooled to room temperature naturally, and the uniformity was improved after grinding again, and then continued to be heated to a constant temperature of 1300 °C in an air environment 2 h, and then cooled to room temperature naturally. Finally, ...

Embodiment 3

[0034] Example 3: Li 2 MgTiO 4 : Mn 4+ , Ga 3+ , NH 4 Cl

[0035] According to Li 2 MgTi(1- x - y )O 4 : x mn 4+ , y Ga 3+ ( x =0, 0.2%, 0.4%, 0.6%, 0.8%, 1.0%; y =0,0.1, 0.2, 0.3, 0.4, 0.5) stoichiometric ratio, weigh Li 2 CO 3 (AR), TiO 2 (AR), MgO (AR), ZnO(AR), MnO 2 (AR), Ga 2 o 3 (AR) mixed, and weighed 5mol% Li 2 CO 3 Compensation for Li ions evaporated at high temperature. Then weigh an appropriate amount of 1.0~3.0wt% flux NH 4 Cl. The obtained mixed product was placed in an agate mortar, 5 mg of absolute ethanol was added, and then ground for 30 min until the mixture was homogeneous. Then the obtained sample powder was placed in a quartz crucible, heated to 600 °C at 6 °C / min for preheating for 6 h, then cooled to room temperature naturally, and the uniformity was improved after grinding again, and then continued to be heated to a constant temperature of 1300 °C in an air environment 2 h, and then cooled to room temperature naturally. Finall...

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Abstract

The invention discloses dark red fluorescent powder for plant illumination under blue light excitation and a preparation method of the dark red fluorescent powder. A chemical formula of the fluorescent material is Li<2>MTi<1-x-y>O<4>: xMn<4+>, yGa<3+>, wherein x is greater than 0 and smaller than or equal to 1%, y greater than 0 and smaller than or equal to 0.5, and M is Mg or Zn. The fluorescentpowder has strong absorption to near ultraviolet and blue light bands, the emission band of the powder covers 600-800 nm, and the peak value of the powder is 675 nm. The invention also provides a preparation method of the powder. The preparation method comprises the following steps: mixing raw materials according to a certain ratio, and adding a proper amount of a fluxing agent to lower sinteringtemperature and reduce cost. Transition metal Mn<4+> with a price lower than the price of rare earth elements is used as an activating agent; and a high-temperature solid-phase method is adopted for preparation of the powder, and the method is simple in process, low in production cost and easy for large-scale production. Meanwhile, the emission waveband of the fluorescent powder is matched with aplant pigment absorption waveband, and the fluorescent powder is dark red fluorescent powder suitable for plant light supplement.

Description

technical field [0001] The invention relates to the field of luminescent materials, in particular to a high-efficiency, high-thermal-stability deep red LED fluorescent powder formula for plant growth lamps and a preparation method thereof. Background technique [0002] Facility agriculture has the advantages of controllable planting risks and large-scale cultivation, which plays an increasingly important role in improving the yield and quality of agricultural products. Light is the energy source for plant growth, and facility agriculture requires a large number of artificial light sources to supplement light for plants. However, the light-emitting area of ​​light-emitting devices widely used in white light lighting, such as high-pressure sodium lamps, fluorescent lamps, and incandescent lamps, cannot completely match the absorption area of ​​plant growth pigments, which affects the effect of plant light supplementation. The growth pigment related to plant photosynthesis, ph...

Claims

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Application Information

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IPC IPC(8): C09K11/67F21V9/30A01G9/20
CPCC09K11/673F21V9/30A01G9/20
Inventor 张乐张永丽甄方正康健邵岑罗泽陈东顺赵超
Owner XINYI XIYI ADVANCED MATERIALS RES INST OF IND TECH CO LTD
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