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Cr<3+>-doped germanium-containing garnet phase broadband near-infrared fluorescent powder and preparation method thereof

A garnet phase and phosphor technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of excitation, large packaging volume, spectral bandwidth of tungsten halogen lamps, etc., to expand the selection range, improve luminescence performance, emission spectrum The effect of bandwidth

Pending Publication Date: 2020-10-16
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Near-infrared spectroscopy technology has the characteristics of fast and non-destructive detection. It has great application prospects in the fields of agricultural products and food detection and analysis, early diagnosis of diseases and biological imaging. However, there is currently a lack of an efficient, wide-band, and miniaturized near-infrared light source. , seriously restricting the rapid development of the technology
There are still many problems in the current near-infrared light source: 1) the halogen tungsten lamp has the characteristics of spectral bandwidth, high power consumption, large package volume, and short life; 2) the near-infrared LED array has a long life and high efficiency, but the emission spectrum is narrow ( <50nm); 3) Although LEDs converted from near-infrared phosphors have the characteristics of long life, high efficiency, and low cost, it is still an urgent problem to be solved that they can be effectively excited by blue light
[0003] At present, the high-temperature solid-phase method is used to prepare Cr 3+ Doped germanium-containing garnet-phase broadband near-infrared phosphors have not seen any public reports

Method used

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  • Cr&lt;3+&gt;-doped germanium-containing garnet phase broadband near-infrared fluorescent powder and preparation method thereof
  • Cr&lt;3+&gt;-doped germanium-containing garnet phase broadband near-infrared fluorescent powder and preparation method thereof

Examples

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Effect test

Embodiment 1

[0023] a Cr 3+ Doped germanium-containing garnet phase broadband near-infrared phosphor, the material is a solid powder, the molecular formula is Y 3 Al 2.95 ZnO 12 :0.05Cr 3+ . The preparation method is as follows: weigh yttrium oxide (99.99%), aluminum oxide (99.99%), germanium oxide (99.99%), zinc oxide (99.99%), and dichromium oxide (99.95%) according to the stoichiometric ratio. They are 0.8468g, 0.3833g, 0.2616g, 0.2035g, 0.0098g respectively. Grind the above raw materials thoroughly and carefully with an agate mortar, and after mixing thoroughly, place the obtained precursor in a corundum crucible. Under an air atmosphere, heat up to 1300°C in a high-temperature box furnace at a rate of 10°C / min, and roast at a constant temperature for 12 hours. Then cool down to room temperature with the furnace, take out and grind into a uniform powder, which is the required phosphor. Its excitation spectrum and emission spectrum were measured by fluorescence spectrometer (such ...

Embodiment 2

[0025] a Cr 3+ Doped germanium-containing garnet phase broadband near-infrared phosphor, the material is a solid powder, the molecular formula is Y 3 Al 2.97 GeCaO 12 :0.03Cr 3+ . The preparation method is as follows: weigh yttrium oxide (99.99%), aluminum oxide (99.99%), germanium oxide (99.99%), calcium carbonate (99.90%), dichromium trioxide (99.95%) according to the stoichiometric ratio, and the specific mass They are 1.3549g, 0.6056g, 0.4184g, 0.4004g, 0.0091g ​​respectively. Grind the above raw materials thoroughly and carefully with an agate mortar, and place the obtained precursor in a corundum crucible after fully mixing. Under a nitrogen atmosphere, a high-temperature box furnace is heated to 1200°C at a rate of 5°C / min, and the temperature is kept at a constant temperature for 10 hours. Cool down to room temperature with the furnace, take out and grind into a uniform powder, which is the required phosphor. The detection found that the material is a garnet phas...

Embodiment 3

[0027] a Cr 3+ Doped germanium-containing garnet phase broadband near-infrared phosphor, the material is solid powder, and the molecular formula is Y 3 Al 2.99 GeMgO 12 :0.01Cr 3+ . The preparation method is as follows: weigh yttrium oxide (99.99%), aluminum oxide (99.99%), germanium oxide (99.99%), magnesium oxide (99.99%), and dichromium oxide (99.95%) according to the stoichiometric ratio. They are 1.6936g, 0.7622g, 0.5230g, 0.2015g, 0.0038g respectively. Grind the above-mentioned raw materials thoroughly and carefully with an agate mortar, and place the obtained precursor in a corundum crucible after fully mixing. Cool down to room temperature with the furnace, take out and grind into a uniform powder, which is the required phosphor. The detection found that the material is a garnet phase, with a broad near-infrared emission peak between 650-850nm, the peak is located at 760nm, the half-maximum width is 118nm, and there is a strong excitation peak between 400-500nm, ...

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Abstract

The invention discloses a Cr<3+>-doped germanium-containing garnet phase broadband near-infrared fluorescent powder and a preparation method thereof, and belongs to the technical field of near-infrared luminescence. The germanium-containing garnet phase fluorescent powder is prepared by a high-temperature solid-phase method, and the preparation method comprises the following steps: grinding and uniformly mixing solid powder raw materials, calcining at 1200-1500 DEG C for 1-3 times, and finally grinding to obtain a final product. On the basis of a garnet structure with stable chemical properties and high luminous efficiency, the garnet phase structure fluorescent powder containing elements such as germanium, zinc, magnesium, calcium, strontium and the like is constructed in a weak crystal field environment, so that a Cr<3+> emission peak is red-shifted to a near-infrared region. The obtained garnet fluorescent powder realizes red shift of a Cr<3+> emission peak, has excellent propertiesof near-infrared broadband luminescence, wide emission range (650-850 nm), capability of being excited by blue light, high emission efficiency and the like, and is low in raw material cost, simple and convenient in operation method and capable of being produced on a large scale.

Description

technical field [0001] The invention belongs to the field of near-infrared luminescent materials, in particular to a Cr 3+ The doped germanium-containing garnet-phase broadband near-infrared fluorescent powder and the preparation method thereof can be used as a near-infrared light source in the fields of non-destructive testing and biological imaging. Background technique [0002] In recent years, the near-infrared spectroscopy technology developed by taking advantage of the advantages of small energy and strong penetration of near-infrared light has attracted more and more attention of scientific researchers. Near-infrared spectroscopy technology has the characteristics of fast and non-destructive detection. It has great application prospects in the fields of agricultural products and food detection and analysis, early diagnosis of diseases and biological imaging. However, there is currently a lack of an efficient, wide-band, and miniaturized near-infrared light source. , ...

Claims

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Application Information

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IPC IPC(8): C09K11/80
CPCC09K11/7707
Inventor 潘再法张聪蒋佳颖邵康
Owner ZHEJIANG UNIV OF TECH
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