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Yellow and green light long-afterglow material with improvement on afterglow performance by adding boron as well as preparation method of the material

A technology of long afterglow materials and yellow-green light, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of high sintering process requirements for transparent ceramic materials and the inability to complete common experimental conditions, and achieve wide excitation and emission ranges and low equipment costs. Pollution, effect of low equipment cost

Inactive Publication Date: 2019-04-02
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ueda et al. of Japan realized the excellent long afterglow performance of gallium aluminum garnet-based long afterglow materials by adjusting the defect energy level by adding ions. However, the research objects are mainly ceramic materials. The sintering process of transparent ceramic materials requires high requirements, and ordinary experimental conditions cannot be completed.

Method used

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  • Yellow and green light long-afterglow material with improvement on afterglow performance by adding boron as well as preparation method of the material
  • Yellow and green light long-afterglow material with improvement on afterglow performance by adding boron as well as preparation method of the material
  • Yellow and green light long-afterglow material with improvement on afterglow performance by adding boron as well as preparation method of the material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The composition coefficients of the long-lasting luminescent material are a=0.015, b=0.003, and x=0.005. The raw materials are weighed according to the chemical molar ratio and mixed evenly, and calcined in air, reducing gas or high-pressure inert atmosphere at a temperature of 1400-1600°C for 4 hours. The fired samples were ground and pulverized, then cleaned with deionized water, ethanol and dilute acid, and finally dried at 60°C. Measure emission spectrum, photoexcitation spectrum, afterglow decay curve and thermal excitation spectrum.

Embodiment 2

[0029] The composition coefficients of the long-lasting luminescent material are a=0.015, b=0.003, and x=0.01. The raw materials are weighed according to the chemical molar ratio and mixed evenly, and calcined in air, reducing gas or high-pressure inert atmosphere at a temperature of 1400-1600°C for 4 hours. The fired samples were ground and pulverized, then cleaned with deionized water, ethanol and dilute acid, and finally dried at 60°C. Measure emission spectrum, photoexcitation spectrum, afterglow decay curve and thermal excitation spectrum.

Embodiment 3

[0031] The composition coefficients of the long-lasting luminescent material are a=0.015, b=0.003, and x=0.02. The raw materials are weighed according to the chemical molar ratio and mixed evenly, and calcined in air, reducing gas or high-pressure inert atmosphere at a temperature of 1400-1600°C for 4 hours. The fired samples were ground and pulverized, then cleaned with deionized water, ethanol and dilute acid, and finally dried at 60°C. Measure emission spectrum, photoexcitation spectrum, afterglow decay curve and thermal excitation spectrum.

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Abstract

A yellow and green light long-afterglow material with improvement on the afterglow performance by adding boron as well as a preparation method of the material. The invention belongs to the field of luminescent materials. In the method, a gallium-aluminum garnet based material is used as a substrate, Ce (III) is used as an activator, Yb (III) is used as a defect level capture center, and Y, Al, Gaand O form matrix lattices. In the synthetic process, a boron-based compound is added for regulating the structure and the afterglow performance of the long-afterglow material, so that the yellow andgreen light long-afterglow material which has good crystalline performance, long afterglow time, high afterglow intensity and wide excitation and emission range can be produced. The long-afterglow material can be excited by ultraviolet light and visible light with excitation wavelength range being 300-500 nm and can emit a yellow and green light with emitting wavelength range being 450-700 nm. Byadding boric acid or boron oxide, as a cosolvent, to the material, the crystalline performance of a sample is significantly enhanced; meanwhile, when boron ions enter the matrix lattices, microstructures can be regulated, and depth of defect level is increased and concentration of the defect level is increased; therefore, the afterglow time and afterglow intensity are enhanced simultaneously.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials and relates to a yellow-green light long afterglow material which can be effectively excited by visible light and whose crystallinity, afterglow time and afterglow intensity are improved at the same time. The material can be especially applied to lighting display systems. Background technique [0002] Long afterglow luminescent materials have the function of "light storage". When irradiated by a light source, a part of the light energy will be captured by the trap energy level in its structure and stored in the structure of the material. When the irradiation is over, this part of the stored energy will continue to The glowing form is released, which in turn produces a long afterglow. At present, there are many kinds of long-lasting luminescent materials, including aluminates, silicates, and sulfides. Among them, gallium aluminum garnet-based long-lasting luminescent materials are po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
CPCC09K11/778
Inventor 刘泉林周丹丹王志珍
Owner UNIV OF SCI & TECH BEIJING
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