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Long-afterglow luminescent material, preparation method and application thereof, and display device

A long afterglow luminescence and display device technology, applied in the directions of luminescent materials, chemical instruments and methods, can solve the problems of difficulty in obtaining single-phase compounds, reducing product performance, and difficulty in mixing raw materials uniformly, reducing the difficulty of milling and speeding up The effect of improving response speed and luminous brightness

Active Publication Date: 2021-07-13
HUNAN FIRST NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Alkaline-earth aluminate long-lasting luminescent materials are usually prepared by high-temperature solid-state sintering, but this method has the disadvantages of high synthesis temperature, difficulty in mixing uniform raw materials, difficulty in obtaining single-phase compounds, coarse grains, and high hardness of the product. Due to the destruction of the crystal form or the mixing of impurities, the luminous brightness is greatly reduced, which reduces the performance of the product

Method used

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  • Long-afterglow luminescent material, preparation method and application thereof, and display device
  • Long-afterglow luminescent material, preparation method and application thereof, and display device
  • Long-afterglow luminescent material, preparation method and application thereof, and display device

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preparation example Construction

[0047] An embodiment of the present invention also provides a preparation method of a long-lasting luminescent material, which includes the following steps S10-S20.

[0048] Step S10, according to the general formula Sr 1-y-z al 2-x S x o 4 :yEu 2+ ,zDy 3+ The quantitative relationship provides raw materials: strontium carbonate, aluminum oxide, europium oxide, dysprosium oxide and elemental sulfur, where 0<x<0.5, 0<y<0.1, 0≤z<0.2.

[0049] Understandably, according to the general formula Sr 1-y-z al 2-x S x o 4 :yEu 2+ ,zDy 3+ The metering relationship provides raw materials, which refers to the Sr, Al, S, Eu and Dy in the general formula 3 The molar stoichiometric relationships for strontium carbonate, aluminum oxide, elemental sulfur, europium oxide, and dysprosium oxide are provided accordingly. When z is 0, it means that there is no dysprosium trioxide in the raw material.

[0050] Step S20, after mixing the raw materials provided in step S10, calcining in a ...

Embodiment 1

[0071] 1) Weigh the raw materials aluminum oxide (0.5592 g), strontium carbonate (0.8523 g), europium trioxide (0.0203 g), elemental sulfur (0.0186 g), grind and mix evenly to obtain a mixed material.

[0072] 2) The mixed material in step 1) is placed in a CO atmosphere, and calcined at 1250° C. for 2 hours. Cool naturally to room temperature after calcination, and then grind the product finely to obtain a powdery long-lasting luminescent material with a structure of Sr 0.98 Al 1.9 S 0.1 o 4 :0.02Eu 2+ .

[0073] 3) Carry out X-ray diffraction experiment to the powdery long afterglow luminescent material that embodiment 1 makes, specifically as follows figure 1 shown.

[0074] 4) Scanning electron microscope experiment was carried out on the powdery long afterglow luminescent material prepared in Example 1, and the scanning electron microscope picture is as follows figure 2 shown.

[0075] 5) Excite the powdery long-lasting luminescent material prepared in Example 1 ...

Embodiment 2

[0077] 1) Weigh the raw materials aluminum oxide (0.5298 g), strontium carbonate (0.8523 g), europium oxide (0.0203 g), elemental sulfur (0.0372 g), grind and mix evenly to obtain a mixed material.

[0078] 2) The mixed material obtained in step 1) was calcined at 1250° C. for 2 hours in a CO atmosphere. Cool naturally to room temperature after calcination, and then grind the product finely to obtain a powdery long-lasting luminescent material with a structure of Sr 0.98 Al 1.8 S 0.2 o 4 :0.02Eu 2+ .

[0079] 3) Place the powdery long-lasting luminescent material prepared in Example 2 under the excitation light with a wavelength of 365nm for excitation for 3 minutes, then turn off the excitation light source, and observe the change of the luminous intensity of the long-lasting luminescent material in a dark environment. It is found that: Example 2 The long afterglow of the prepared powder can be observed with naked eyes for 40 minutes.

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Abstract

The invention relates to a long-afterglow luminescent material as well as a preparation method and application thereof. The general formula of the long-afterglow luminescent material is Sr (1-y-z) Al (2-x) SxO4: yEu < 2 + >, zDy < 3 + >, wherein 0 < x < 0.5, 0 < y < 0.1, and 0 < = z < 0.2. The long-afterglow luminescent material contains specific sulfur, and compared with a traditional strontium aluminate long-afterglow luminescent material, the long-afterglow luminescent material is high in luminescent intensity and long in afterglow time.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a long afterglow luminescent material, a preparation method and application thereof, and a display device. Background technique [0002] Long afterglow luminescent materials belong to photoluminescent materials, which can absorb light and store energy under the excitation of sunlight and ultraviolet light for a short time. A functional material that continues to emit light over a long period of time. This kind of material can emit various colors of light stably and efficiently, with high luminous brightness, no radioactivity, good weather resistance, and can be used repeatedly. It is widely used in light sources, optoelectronic devices, concealed lighting and safety signs, etc. It is a green and environmentally friendly lighting material . [0003] At present, the long afterglow luminescent materials mainly include alkaline earth aluminates. SrAl 2 o 4 :Eu 2+ ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/64
CPCC09K11/7792
Inventor 陈万平周阿春曾伟民
Owner HUNAN FIRST NORMAL UNIV
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