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A near-infrared long afterglow luminescent material of zinc stannate doped with trivalent chromium ions and its preparation method

A technology of ion doping and luminescent materials, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of increasing applications and staying in the luminescence band, and achieves the effects of wide selection of materials, simple preparation methods and low prices

Active Publication Date: 2015-10-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] But so far, the luminescence band of long afterglow materials stays in the visible region, and there are relatively few studies on near-infrared luminescent long afterglow materials. Due to the unique characteristics of long afterglow materials, their applications in the field of biomedicine are increasing.

Method used

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  • A near-infrared long afterglow luminescent material of zinc stannate doped with trivalent chromium ions and its preparation method
  • A near-infrared long afterglow luminescent material of zinc stannate doped with trivalent chromium ions and its preparation method
  • A near-infrared long afterglow luminescent material of zinc stannate doped with trivalent chromium ions and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0025] According to the following composition: near-infrared long afterglow luminescent material Zn 2 SnO 4 : Cr, Zn 2 SnO 4 as the matrix, doped with Cr 3+ is the active ion, where Cr 3+ The doping amount of ions is 0.01mol%. Zinc oxide, tin oxide, and chromium oxide were weighed separately, ground and mixed, pre-fired at 800°C for 4 hours, taken out, ground again, and fired at 1350°C for 3 hours.

[0026] The fluorescence spectrum of the near-infrared long-lasting luminescent material prepared in this example is as follows: figure 1 with figure 2 As shown, the emission spectrum under excitation at 325nm emits fluorescence at 600nm-1200nm, and the luminescence peaks are located at 700nm and 800nm. image 3 The excitation spectra corresponding to the luminescence peaks shown in , the three excitation peaks obtained are located at 325nm, 430nm and 610nm respectively, confirming that the luminescence center is Cr ion. Figure 4 The long-lasting fluorescence spectrum of t...

Embodiment 2

[0028] According to the following composition: near-infrared long afterglow luminescent material Zn 2 SnO 4 : Cr, Zn 2 SnO 4 as the matrix, doped with Cr 3+ is the active ion, where Cr 3+ The doping amount of ions is 5mol%. Weigh zinc oxide, tin oxide, and chromium oxide respectively, grind and mix them, pre-fire at 900°C for 6 hours, take them out, grind again, and fire at 1400°C for 5 hours.

[0029] Image 6 The near-infrared long afterglow luminescent material prepared for this example was irradiated under sunlight for 10 minutes to monitor the 800nm ​​afterglow attenuation, which showed that the material had a near-infrared long afterglow of up to 24 hours.

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Abstract

The invention discloses a trivalent chromium ions-doped zinc stannate near-infrared long-persistence luminescent material. Zn2SnO4 is used as a matrix, and doped ions Cr<3+> are activating ions, wherein the doped amount of Cr<3+> is 0.01-5mol%. The invention also discloses a preparation method of the trivalent chromium ions-doped zinc stannate near-infrared long-persistence luminescent material. The preparation method comprises the following steps: 1, material weighing: respectively weighing a zinc-containing compound, a tin-containing compound and a chromium-containing compound; and 2, grinding the above materials, uniformly mixing, pre-sintering the above obtained mixture at 600-900DEG C for 1-12h, taking out the pre-sintered mixture, grinding, sintering the ground mixture at 1300-1500DEG C for 2-5h to obtain the trivalent chromium ions-doped zinc stannate near-infrared long-persistence luminescent material. The luminescence wavelength and the emission peak of the near-infrared long-persistence luminescent material prepared in the invention are positioned in 650-1200nm and 800nm respectively, and the persistence time of the luminescent material is longer than 24h.

Description

technical field [0001] The invention relates to a near-infrared long-lasting luminescent material, in particular to a trivalent chromium ion-doped zinc stannate near-infrared long-lasting luminescent material and a preparation method thereof. Background technique [0002] Long afterglow materials are materials that can still be observed to emit light after a period of excitation (such as X-ray, ultraviolet light, visible light, electron beam, etc.) wait. The research objects of early long afterglow materials mainly focused on sulfides, such as ZnS: Cu (green light), CaS: Bi (blue light), CaS: Eu, Tm (red light), but the stability of sulfides is poor. The later developed rare earth doped aluminate long afterglow luminescent material (SrAl 2 o 4 :Eu 2+ , Dy 3+ ,CaAl 2 o 4 :Eu 2+ ,Nd 3+ ) and silicate materials (MgSiO 3 :Eu 2+ , Dy 3+ ,Mn 2+ , Ca 3 MgSi 2 o 8 :Eu 2+ , Dy 3+ etc.) Long afterglow time, high brightness, good water and alkali resistance. [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/66
Inventor 邱建荣李杨李意扬董国平
Owner SOUTH CHINA UNIV OF TECH
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