Cr-doped near-infrared long-afterglow luminescent material with perovskite structure and preparation method thereof

A perovskite structure and luminescent material technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of limiting the application of long afterglow materials and slow development of long afterglow materials, so as to improve long afterglow luminescence and facilitate large-scale promotion , the effect of cheap raw materials

Active Publication Date: 2015-08-26
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

The development of long afterglow materials in the near-infrared region is extremely slow, which limits the application of long afterglow materials in biological imaging

Method used

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  • Cr-doped near-infrared long-afterglow luminescent material with perovskite structure and preparation method thereof
  • Cr-doped near-infrared long-afterglow luminescent material with perovskite structure and preparation method thereof
  • Cr-doped near-infrared long-afterglow luminescent material with perovskite structure and preparation method thereof

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Embodiment 1

[0035] The single doped Cr of this embodiment 3+ CaTiO 3 The preparation method of the near-infrared long afterglow luminescent material is as follows:

[0036] According to the following composition: the matrix is ​​CaTiO 3 ;Cr 3+ The doping amount is 0.001mol%; Weigh titanium oxide, calcium carbonate, chromium oxide (Cr 2 o 3 ), after grinding and mixing in a reducing atmosphere (5% (volume percentage) H 2 +95% (volume percentage) N 2 ) at 900°C for 3 hours, then take it out, grind it again, and burn it at 1450°C for 2 hours.

[0037] The long afterglow spectrum of the near-infrared long-afterglow luminescent material prepared in this embodiment is shown in Figure 1 (a). After irradiating with 254 nm ultraviolet light for 10 minutes, the test was performed after an interval of 30 seconds, and the near-infrared long-afterglow luminescence was obtained. The luminescence peak is located at 766,780 nm. As shown in Figure 1(b), the near-infrared long afterglow luminescenc...

Embodiment 2

[0039] Cr in this example 3+ and Bi 3+ Co-doped SrTiO 3 The preparation method of the near-infrared long afterglow luminescent material is as follows:

[0040] According to the following composition: the matrix is ​​SrTiO 3 ;Cr 3+ The doping amount is 5mol%, Bi 3+ The doping amount is 20mol%; Weigh titanium oxide, strontium carbonate, chromium oxide (Cr 2 o 3 ), bismuth oxide (Bi 2 O), after grinding and mixing, pre-fire at 600°C for 1 hour in the air, take it out, grind again, and burn at 1300°C for 5 hours.

[0041] The long afterglow spectrum of the near-infrared long-lasting luminescent material prepared in this embodiment is shown in Figure 2(a). After irradiating with 254 nm ultraviolet light for 10 minutes, the test was performed after an interval of 30 seconds, and the near-infrared long-lasting luminescence was obtained. The luminescence peak is located at 766 nm. As shown in Figure 2(b), the near-infrared long afterglow luminescence at 766 nm was monitored, ...

Embodiment 3

[0043] The single doped Cr of this embodiment 3+ BaSnO 3 The preparation method of the near-infrared long afterglow luminescent material is as follows:

[0044] According to the following composition: the matrix is ​​BaSnO 3 ;Cr 3+The doping amount is 5mol%; Weigh tin oxide, barium carbonate, chromium oxide respectively, grind and mix them in reducing atmosphere (5% H 2 +95%N 2 ) at 600°C for 1 hour, take it out, grind it again, and then fire it at 1350°C for 5 hours.

[0045] The long afterglow spectrum of the near-infrared long-afterglow luminescent material prepared in this embodiment is shown in Figure 3(a). After being irradiated with 254 nm ultraviolet light for 10 minutes and tested after an interval of 30 seconds, the near-infrared long afterglow luminescence was obtained. The luminescence peak is located at 800 nm. As shown in Figure 3(b), the near-infrared long afterglow luminescence at 800 nm was monitored, and the discovery time was as long as 100 minutes. I...

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Abstract

The invention discloses a Cr-doped near-infrared long-afterglow luminescent material with a perovskite structure. A substrate material of the luminescent material is ABO3, wherein A is Ca, Sr or Ba, B is Sn or Ti, and 0.001 to 5 mol% of Cr<3+> is doped in the substrate material. The invention further discloses a preparation method for the near-infrared long-afterglow luminescent material. The method comprises the following steps: (1) separately weighing a compound containing A, a compound containing Ti and a compound containing Cr; and (2) after grinding and uniform mixing of the above compounds, presintering the obtained mixture in the air/reductive atmosphere, then grinding the mixture again and carrying out sintering in the air/reductive atmosphere for a plurality of hours. The near-infrared long-afterglow luminescent material prepared in the invention has an emission band located at 650 to 850 nm, an emission peak at 760 nm and afterglow time of as long as 100 min. The preparation method is simple, uses cheap raw materials and can easily realize large-scale technical popularization.

Description

technical field [0001] The invention relates to a nano near-infrared long afterglow luminescent material, in particular to a Cr-doped perovskite structure near-infrared long afterglow luminescent material and a preparation method. Background technique [0002] Optical imaging, using photons as an information source, represents a rapidly expanding field with direct applications in pharmacology, molecular cell biology, and diagnostics. However, this technique still has many limitations, especially the tissue autofluorescence produced by in vivo illumination and the weak tissue permeability under short-wave excitation light irradiation. In order to overcome these difficulties, scientists have studied a series of inorganic light-emitting materials, which emit light in the near-infrared region (NIR). Molecules emit near-infrared light (700-1100nm), which can be used for the detection of living molecular targets, because biological blood and Tissue is relatively transparent in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/68
Inventor 邱建荣李杨陈汝春秦嬉嬉吴溢铃
Owner SOUTH CHINA UNIV OF TECH
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