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Yellow long-persistence luminescent material and preparation method thereof

A long afterglow luminescence, yellow technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of the lack of long afterglow phosphors, the impossibility of long afterglow luminescence, and the inability to meet application requirements, etc., to achieve stable chemical properties of products, afterglow Long-lasting, non-radioactive effects

Active Publication Date: 2019-09-20
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the different attenuation of long-lasting phosphors of various colors, it is impossible to achieve this goal through the three primary colors of red, green and blue for long-lasting luminescence. Therefore, it is necessary to develop long-lasting materials of various colors
[0003] At present, blue and green long-lasting phosphors have become mature and have been used in actual production. However, yellow long-lasting phosphors with excellent performance are still scarce.
The afterglow duration of existing yellow afterglow materials is generally short. For example, patent 201510217356.5 discloses that the afterglow duration of a yellow long afterglow material is only 5 hours, which is far less than the afterglow time of blue and green long afterglow materials, which cannot meet the actual application requirements.

Method used

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  • Yellow long-persistence luminescent material and preparation method thereof
  • Yellow long-persistence luminescent material and preparation method thereof
  • Yellow long-persistence luminescent material and preparation method thereof

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preparation example Construction

[0049] The present invention also provides a preparation method for the above-mentioned yellow long-lasting luminescent material, comprising the following steps:

[0050] A) mixing a barium source compound, a bismuth source compound, a gallium source compound, an alkali metal source compound, a compound containing an R element, and a compound containing an M element to obtain a mixture;

[0051] B) Sintering the mixture to obtain a yellow long-lasting luminescent material.

[0052] Wherein, the barium source compound is selected from one or more of barium oxide, carbonate, silver nitrate, oxalate, citrate and acetate, preferably barium carbonate or barium oxide.

[0053] The bismuth source compound is selected from one or more of bismuth oxides, carbonates and nitrates, preferably bismuth oxide, bismuth nitrate or bismuth carbonate.

[0054] The gallium source compound is selected from one or more of gallium oxides, hydroxides and nitrates, preferably gallium oxide.

[0055]...

Embodiment 1

[0065] Raw material is BaCO 3 (analytical pure), Ga 2 o 3 (analytically pure), Bi 2 o 3 (spectrally pure) and Li 2 CO 3 (Analytical pure), the molar ratio between them is 0.94:1.0:0.015:0.015, weigh the raw materials according to the above ratio, mix them and place them in a corundum crucible, then put them into a high-temperature furnace in an air atmosphere at 1350°C Roasting for 10 hours, and naturally cooling to room temperature, a yellow afterglow luminous powder was obtained. The obtained yellow phosphor is a white powder with a molecular formula of Ba 0.94 Li 0.03 Ga 2 o 4 :0.03Bi, see figure 1 , figure 1 The X-ray powder diffraction pattern of the long-lasting luminescent material provided in Example 1 of the present invention. Its excitation and emission spectra are broadband, such as figure 2 As shown; under near-ultraviolet excitation, the maximum emission wavelength of the phosphor is located near 630nm, and the emission color is yellow. After contin...

Embodiment 2

[0067] Raw material is BaCO 3 (analytical pure), Ga 2 o 3 (analytically pure), Bi 2 o 3 (spectrally pure) and Li 2 CO 3 (Analytical pure), the molar ratio between them is 0.94:1.0:0.015:0.015, weigh the raw materials according to the above ratio, mix them and place them in a corundum crucible, then put them into a high-temperature furnace in an air atmosphere at 1000°C Roasting for 24 hours, and naturally cooling to room temperature, a yellow afterglow luminous powder is obtained. The obtained yellow phosphor is a white powder with a molecular formula of Ba 0.94 Li 0.03 Ga 2 o 4 :0.03Bi. Under near-ultraviolet excitation, the luminescent color of the phosphor is yellow. After irradiating with 254nm ultraviolet light for 5 minutes, the light source is removed, and the afterglow of the material can last for more than 20 hours.

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Abstract

The invention provides a yellow long-persistence luminescent material. The yellow long-persistence luminescent material is a yellow long-persistence luminescent material doped with a low-valence alkali metal ion and a high-valence rare earth ion and adopting barium gallate as a matrix and a Bi ion is a luminescent center. Compared with long-persistence materials in the prior art, the long-persistence of the invention has a bright afterglow and a long persistence, and the longest persistence is 48 h or more; and the long-persistence luminescent material has the advantages of simple preparation process, stable chemical properties, fluffiness, easiness in grinding, non-radioactivity, and harmlessness to the environment.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a yellow long-lasting luminescent material and a preparation method thereof. Background technique [0002] Long afterglow luminescent material is a new type of energy-saving low-light lighting material. The material can effectively absorb ultraviolet or visible light, store energy, and release this energy in the form of light. It is widely used in low-light lighting, building flaw detection, and luminescence. In the fields of indication and communication LED, just like other lighting and display industries, it is the ultimate goal of the long-lasting luminescent material industry to pursue multi-color long-lasting luminous materials to achieve full-color luminous lighting. However, due to the different attenuation of long-lasting phosphors of various colors, it is impossible to achieve this goal through the three primary colors of red, green and blue for...

Claims

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Application Information

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IPC IPC(8): C09K11/62
CPCC09K11/7421C09K11/7703
Inventor 李成宇庞然李慧敏姜丽宏张粟李达
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI