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An aluminate-based near-infrared long-lasting luminescent material and its preparation method

A luminescent material and aluminate technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of low gallium content and high cost, and achieve the effects of low cost and simple preparation method

Active Publication Date: 2021-08-31
HANSHAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Cr 3+ Near-infrared long-lasting materials represented by ion doping exhibit superior optical properties, but are currently suitable for Cr 3+ There are fewer doped hosts, and they are basically concentrated in materials such as gallates
However, the content of gallium in the earth's crust is very small, and the cost of using gallate as a matrix is ​​relatively high. Therefore, it is of great fundamental and applied research significance to explore high-efficiency near-infrared long-lasting materials using non-gallate as a matrix

Method used

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  • An aluminate-based near-infrared long-lasting luminescent material and its preparation method
  • An aluminate-based near-infrared long-lasting luminescent material and its preparation method
  • An aluminate-based near-infrared long-lasting luminescent material and its preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Accurately weigh the raw materials ZnO and Al according to the molar ratio 2 o 3 、GeO 2 , and Cr 2 o 3 , the corresponding molar ratio is 1.2:0.8:0.2:0.25%. After the weighed raw materials are ground and mixed evenly, they are placed in a corundum crucible, placed in a high-temperature furnace, and pre-fired in an air atmosphere. The pre-fired temperature is 1000°C , preheated for 2 hours, and naturally cooled to room temperature. Grind the obtained product, put it into an air atmosphere high-temperature furnace for high-temperature sintering at a temperature of 1400°C, sinter for 6 hours, cool naturally to room temperature, and grind again to obtain Cr-doped aluminate-based near Infrared long afterglow glow powder. The obtained material was analyzed by X-ray diffractometer, and the results are as attached figure 1 shown. Depend on figure 1 It can be seen that doping Ge does not cause the formation of new phases, which proves that the near-infrared long-lasting ...

Embodiment 2

[0028] Accurately weigh the raw materials ZnO and Al according to the molar ratio 2 o 3 、GeO 2 , and Cr 2 o 3 , the corresponding molar ratio is 1.3:0.7:0.3:0.25%. After the weighed raw materials are ground and mixed evenly, they are placed in a corundum crucible, put into a high-temperature furnace, and pre-fired in an air atmosphere. The pre-fired temperature is 1000°C , preheated for 2 hours, and naturally cooled to room temperature. Grind the obtained product, put it into an air atmosphere high-temperature furnace for high-temperature sintering at a temperature of 1400°C, sinter for 6 hours, cool naturally to room temperature, and grind again to obtain Cr-doped aluminate-based near Infrared long afterglow glow powder. After testing, the samples all have near-infrared long afterglow emission characteristics after ultraviolet-visible light irradiation, the afterglow time is long, and the afterglow spectrum is as attached Figure 7 As shown, its peak is located at ~690n...

Embodiment 3

[0030] Accurately weigh the raw materials ZnO and Al according to the molar ratio 2 o 3 、GeO 2 , and Cr 2 o 3 , the corresponding molar ratio is 1.4:0.6:0.4:0.25%. After the weighed raw materials are ground and mixed evenly, they are placed in a corundum crucible, placed in a high-temperature furnace, and pre-fired in an air atmosphere. The pre-fired temperature is 1000°C , preheated for 2 hours, and naturally cooled to room temperature. Grind the obtained product, put it into an air atmosphere high-temperature furnace for high-temperature sintering at a temperature of 1400°C, sinter for 6 hours, cool naturally to room temperature, and grind again to obtain Cr-doped aluminate-based near Infrared long afterglow glow powder. After testing, the samples all have near-infrared long afterglow emission characteristics after ultraviolet-visible light irradiation, the afterglow time is long, and the afterglow spectrum is as attached Figure 10 As shown, its peak is located at ~69...

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Abstract

The invention discloses an aluminate-based near-infrared long afterglow luminescent material and a preparation method thereof. The chemical expression of the luminescent material is: Zn 1+x Al 2‑2x Ge x o 4 :yCr 3+ , is composed of ZnO, Al 2 o 3 、GeO 2 , and Cr 2 o 3 The material is made at a molar ratio of 1+x:2-2x:x:y, wherein the value of x is 0.05-0.6, and the value of y is 0.1%-3%. The aluminate-based near-infrared long afterglow luminescent material doped with Cr ions of the present invention adopts Zn 1+x Al 2‑2x Ge x o 4 As a matrix, it has strong near-infrared long afterglow emission characteristics after being irradiated by ultraviolet-visible light. The afterglow emission peak is located at ~690nm. The afterglow luminescence is visible to the naked eye, and the afterglow time is long, exceeding 120 hours. At the same time, the luminescent powder irradiated by ultraviolet-visible light can also obtain light-excited long afterglow luminescence under the light excitation of 980nm wavelength.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to an aluminate-based near-infrared long-lasting luminescent material and a preparation method thereof. Background technique [0002] Long-lasting luminescent materials are a class of functional materials that can store light energy under the irradiation of an external light source and release energy in the form of light after the excitation is stopped. In the past 30 years, long afterglow materials have been widely used in emergency signs and instructions, instrument displays, low-light lighting, biological imaging and other fields. Most of the research on long afterglow materials mainly focuses on blue and green long afterglow materials, the most representative of which is the blue long afterglow material CaAl 2 o 4 :Eu 2+ ,Nd 3+ and green long afterglow material SrAl 2 o 4 :Eu 2 + , Dy 3+ . In comparison, there are few reports on near-infrared long-lasting...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/66
CPCC09K11/685
Inventor 黄锐张毅林圳旭宋捷李洪亮宋超张文星
Owner HANSHAN NORMAL UNIV
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