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A method for improving the water resistance of luminescent materials

A technology of luminescent materials and water resistance, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of uncontrollable film thickness, reduced luminescent performance, poor modification effect, etc.

Inactive Publication Date: 2018-08-24
湖南环森科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Han Li et al. proposed to use emulsion method to modify long-lasting phosphors with water resistance and stability. While the water resistance performance is increased, its luminous performance is reduced because the thickness of the coating cannot be controlled (Han Li, Hou Shuen, Pan Yong. Research on silica sol surface coating of long-lasting luminescent materials [J]. Coating Industry, 2007, 37 (7): 18-21.); In terms of patents, patent CN1488784A introduces a kind of luminescent polyamide as the core layer. The preparation method of the fiber polymer polyamide, polyester, polyester, and polyolefin as the skin layer of long-lasting light-emitting composite fibers is characterized in that there is chemical bonding between the phosphor powder and the polyamide, the phosphor powder is not easy to peel off, and the spinnability is good , but this bonding is only limited to the fluorescent fibers of long-lasting materials, and the obtained modification effect is not good

Method used

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  • A method for improving the water resistance of luminescent materials
  • A method for improving the water resistance of luminescent materials
  • A method for improving the water resistance of luminescent materials

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Enveloped SrAl 2 o 4 : Eu 2+ Phosphor powder samples are subjected to particle size classification through a 400-mesh vibrating sieve to obtain samples with a particle size of 1-10 microns, which are coated with a fluidized bed (shown in the comments) image 3 ), select alumina as the coating material, trimethylaluminum as the aluminum source, nitrogen as the carrier gas, and water as the oxide, and the residence time of each gas is: nitrogen: metal organic gas: nitrogen: oxygen = 2min; 20min; 10min ; 0.5 min. Sampling was performed at the 40th cycle, the 80th cycle, the 120th cycle, the 160th cycle, and the 200th cycle. Through transmission electron microscopy (TEM) the thickness of the film material of the film material on the surface of the material (see Table 1), EDS assists in determining that the aluminum content of the coating layer does not change much, and the Sr element can hardly be observed after 200 cycles (see Table 1). According to the pH change curve...

Embodiment 2

[0047] Enveloped SrAl 2 o 4 : Eu 2+ Phosphor powder samples are subjected to particle size classification through a 500-mesh vibrating sieve to obtain samples with a particle size of less than 1 micron, which are coated with a vibrating bed (showing opinions) Figure 5 ), select alumina as the coating material, trimethylaluminum as the aluminum source, nitrogen as the carrier gas, and water as the oxide, and the residence time of each gas is: nitrogen: metal organic gas: nitrogen: oxygen = 2min; 20min; 10min ; 0.5 min. Sampling was performed at the 40th cycle, the 80th cycle, the 120th cycle, the 160th cycle, and the 200th cycle. Through transmission electron microscopy (TEM) the thickness of the membrane material of the membrane material on the surface of the material (see Table 2), the water resistance of the coated material is improved (see Table 2).

[0048] Table 2 Changes in film thickness and element content after cycle number change and pH change after water treatm...

Embodiment 3

[0051] Coated SrSi 2 o 4: Eu 2+ Phosphor powder samples are subjected to particle size classification through a 400-mesh vibrating sieve to obtain samples with a particle size of 1-10 microns, which are coated with a fluidized bed (shown in the comments) image 3 ), select titanium oxide as the coating material, dicarbonyl bis(cyclopentadienyl) titanium as the titanium source, nitrogen as the carrier gas, and water as the oxide, and the residence time of each gas is: nitrogen: oxygen: nitrogen=10min : 20min: 0.5min: 2min. Sampling was performed at the 40th cycle, the 80th cycle, the 120th cycle, the 160th cycle, and the 200th cycle. By transmission electron microscope (TEM) the thickness of the film material of material surface film material (see Table 3, EDS assists and determines that coating layer titanium content increases substantially, can not observe silicon element (see Table 3) substantially to 200 cycles. By entering water After the PH change curve, it is known t...

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Abstract

The invention discloses a method for improving water resistance of a luminescent material. After size grading, different reactors are selected for cladding according to materials of different granularities, each parameter in the cladding process is controlled strictly, and an obtained clad material can improve water resistance of the luminescent material on the premise of not affecting luminous efficiency of the material.

Description

technical field [0001] The invention belongs to the technical field of light emitting material modification. The invention relates to a method for modifying the surface coating of a luminescent material, in particular to a method for improving the water resistance of the luminescent material through surface coating. Background technique [0002] Among rare earth luminescent materials, different types of luminescent materials are used in various environments, such as sign lighting, luminous paint, copy, military facilities, etc. With the wide application of these luminescent materials, the properties of the luminescent materials themselves are greatly affected in different environments, resulting in a decrease in the luminescent properties of the luminescent materials, or even loss of the luminescent properties. Long afterglow phosphors are usually used outdoors and are in direct contact with water in the air, which poses a great challenge to the water resistance of long aft...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/64C09K11/56
CPCC09K11/025C09K11/7731C09K11/7734
Inventor 周智江放明曾俊黄浩鄢宇森夏永吉
Owner 湖南环森科技有限公司