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Dual-emission fluorescent powder for LED plant illumination, and preparation method and application thereof

A plant lighting and phosphor technology, applied in the fields of botanical equipment and methods, applications, luminescent materials, etc., can solve the problem of ignoring the effect of far-red light

Inactive Publication Date: 2021-07-06
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional LED plant lighting scheme only targets photosynthesis, ignoring the role of far-red light in plant morphogenesis

Method used

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  • Dual-emission fluorescent powder for LED plant illumination, and preparation method and application thereof
  • Dual-emission fluorescent powder for LED plant illumination, and preparation method and application thereof
  • Dual-emission fluorescent powder for LED plant illumination, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] The chemical composition of the double-emission fluorescent powder obtained in this embodiment is K 2 Ca 0.99 PO 4 F:0.01Eu 2+ ,3wt%H 3 BO 3 .

[0039] The raw material composition of double emission phosphor powder in the embodiment 1 of table 1

[0040] raw material CaCO 3

[0041] Accurately weigh analytically pure calcium carbonate (CaCO 3 ), calcium fluoride (CaF 2 ), Potassium dihydrogen phosphate (KH 2 PO 4 ), europium oxide (Eu 2 o 3 ), boric acid (H 3 BO 3 ). The accurately weighed raw materials were fully ground in an agate mortar, mixed evenly, placed in a corundum crucible, and then transferred to a tube furnace. 2 and N 2 Under a mixed reducing atmosphere, sinter in a tube furnace at 960°C for 6 hours, cool down to room temperature with the furnace, and grind to obtain a dual-emission phosphor sample. figure 1 Shown is the XRD collection of illustrative plates of the corresponding sample of embodiment 1, as can be seen, the X-r...

Embodiment 2

[0043] The chemical composition of the dual-emission fluorescent powder obtained in this embodiment is K 2 Ca (1-x) PO 4 F:xEu 2+ ,5wt%NH 4 F (x=0.002; 0.004; 0.008; 0.015; 0.020).

[0044] Different Eu in the embodiment 2 of table 2 2+ Raw material composition of doping concentration dual-emission phosphors

[0045]

[0046] Accurately weigh analytically pure potassium carbonate (K 2 CO 3 ), potassium fluoride (KF), calcium carbonate (CaCO 3 ), ammonium dihydrogen phosphate (NH 4 h 2 PO 4 ), europium oxide (Eu 2 o 3 ), ammonium fluoride (NH 4 F). The accurately weighed raw materials were fully ground in an agate mortar, mixed evenly, placed in a corundum crucible, and then transferred to a tube furnace. 2 and N 2 Under a mixed reducing atmosphere, sinter in a tube furnace at 1000°C for 8 hours, cool down to room temperature with the furnace, and grind to obtain a dual-emission phosphor sample. image 3 Shown are the emission spectra of samples with different...

Embodiment 3

[0048] The chemical composition of the double-emission fluorescent powder obtained in this embodiment is K 2 Ca 0.995 PO 4 F:0.005Eu 2+ ,8wt%LiF.

[0049] The raw material composition of double emission phosphor powder in the embodiment 3 of table 3

[0050] raw material CaCO 3

[0051] Accurately weigh analytically pure calcium carbonate (CaCO3) according to Table 3 3 ), calcium fluoride (CaF 2 ), Potassium dihydrogen phosphate (KH 2 PO 4 ), potassium carbonate (K 2 CO 3 ), europium fluoride (EuF 3 ), lithium fluoride (LiF). The accurately weighed raw materials were fully ground in an agate mortar, mixed evenly, placed in a corundum crucible, and then transferred to a tube furnace. 2 and N 2 Under a mixed reducing atmosphere, sinter in a tube furnace at 1050°C for 4 hours, cool down to room temperature with the furnace, and grind to obtain a dual-emission phosphor sample. It can be seen from the laser confocal imaging excited at 405nm that the dual-...

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Abstract

The invention belongs to the field of luminescent materials, and discloses dual-emission fluorescent powder for LED plant illumination, and a preparation method and application thereof. The general chemical formula of the fluorescent powder is K2Ca1-xPO4F: xEu<2+>, yA, wherein 0 < x <= 0.1; A is a cosolvent, and is one of NH4F, CaF2, KF, H3BO3, LiF and Li2CO3; and y is the weight percentage of A in the total weight of the raw materials for synthesizing the K2Ca1-xPO4F: xEu<2+> fluorescent powder, and y is more than or equal to 0 and less than or equal to 5 wt%. The fluorescent powder shows the characteristic of adjustable emission intensity of cyan light and red light according to different doping concentrations and excitation wavelengths, and the half-peak width of double emission bands is relatively large, so that the fluorescent powder can be matched with plant chlorophyll absorption. The fluorescent powder disclosed by the invention can be excited by ultraviolet and near ultraviolet light, has relatively high light-emitting quantum efficiency and relatively low light-emitting thermal quenching performance, and has a wide application prospect in the field of LED plant illumination.

Description

technical field [0001] The invention belongs to the field of luminescent materials, and in particular relates to a double-emission fluorescent powder for LED plant lighting and a preparation method and application thereof. Background technique [0002] Usually, the growth and development of plants will depend on sunlight, but the industrial production of economic crops such as vegetables and flowers, tissue culture and the propagation of test-tube seedlings also need artificial light sources to supplement light to promote photosynthesis. The photosystem that undergoes photoreaction is composed of a variety of pigments, such as chlorophyll a (Chlorophyll a), chlorophyll b (Chlorophyll b), carotenoids (Catotenoids), etc., and its main absorption spectra are concentrated at 450nm and 660nm. [0003] Therefore, in order to promote photosynthesis, two schemes are mainly used for supplementary light: (1) 450nm blue LEDs and 660nm red LEDs are used to construct plant lighting devic...

Claims

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Application Information

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IPC IPC(8): C09K11/73A01G7/04
CPCA01G7/045C09K11/7739Y02P60/14
Inventor 张学杰孙嘉敏雷炳富张浩然陈炜彬邹西坤庄健乐胡超凡刘应亮
Owner SOUTH CHINA AGRI UNIV
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