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Near-infrared phosphor with broadband emission and its preparation method and application

A fluorescent powder and near-infrared technology, which is applied in the direction of luminescent materials, chemical instruments and methods, semiconductor devices, etc., can solve the problems of narrow infrared light bandwidth, etc., and achieve the effect of simple preparation method, low cost, and enhanced absorption

Active Publication Date: 2020-03-27
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problem that the bandwidth of infrared light emitted by mid-infrared LEDs and infrared lasers in the prior art is very narrow, and to provide a near-infrared phosphor with broadband emission and its preparation method and application

Method used

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  • Near-infrared phosphor with broadband emission and its preparation method and application
  • Near-infrared phosphor with broadband emission and its preparation method and application
  • Near-infrared phosphor with broadband emission and its preparation method and application

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preparation example Construction

[0035] The near-infrared phosphor with broadband emission of the present invention can be prepared by using a variety of existing phosphor preparation methods, without special limitation, the present invention provides a preparation method, but is not limited thereto; the near-infrared phosphor with broadband emission of the present invention The preparation method of infrared phosphor includes the following steps:

[0036] Step 1: Weigh the solid compounds containing R element, Ln element, Ce element, Cr element, L element, M element and B element respectively according to the stoichiometric ratio, mix well, and grind to obtain a mixture;

[0037] Wherein, the solid compound is a mixture of one or more of oxides, carbonates, nitrates, and halides in any proportion;

[0038] Step 2, calcining the mixture obtained in Step 1 at 1400-1650° C. in a reducing atmosphere for 3-8 hours to obtain a sintered body;

[0039] Among them, CO or H 2 and N 2 The mixed gas is used as the re...

Embodiment 1

[0045] Ca 2.96 Cr 0.04 hf 1.96 Cr 0.04 Al 2 SiO 12 Preparation method: Weigh CaCO according to stoichiometric ratio 3 , HfO 2 , Al 2 O 3 , SiO 2 and Cr 2 O 3 , after fully grinding and mixing, put it into a high-purity corundum crucible, in H 2 and N 2 Under the mixed gas of 1500°C for 6 hours, after cooling and discharging, a little grinding, washing, filtering and drying, the near-infrared phosphor with broadband emission characteristics is obtained.

[0046] XRD analysis is carried out to the near-infrared phosphor obtained in Example 1, and the XRD diffraction pattern is as follows: figure 1 shown in curve 1; from figure 1 It can be seen from curve 1 that the phosphor has a garnet structure.

[0047] The emission spectrum and excitation spectrum of the near-infrared phosphor obtained in Example 1 were analyzed, and the results were as follows figure 2 middle curve 1 and image 3 shown, from figure 2 It can be seen from curve 1 that the emission peak of ...

Embodiment 2

[0050] Ca 2 LuHf 1.92 Cr 0.08 Al 3 O 12 Preparation method: Weigh CaCO according to stoichiometric ratio 3 , Lu 2 O 3 , HfO 2 , Al 2 O 3 and Cr 2 O 3 , After fully grinding and mixing the weighed raw materials, put it into a high-purity corundum crucible, and keep it at 1550 °C for 4 hours under CO reduction conditions. Near-infrared phosphors with broadband emission properties.

[0051] XRD analysis is carried out to the near-infrared phosphor obtained in Example 2, and the XRD diffraction pattern is as follows: figure 1 shown in curve 2; from figure 1 It can be seen from curve 2 that the phosphor has a garnet structure.

[0052] The emission spectrum of the near-infrared phosphor obtained in Example 2 is analyzed, and the results are as follows figure 2 shown in curve 2, from figure 2 It can be seen from curve 2 that the emission peak of the phosphor is located at 760 nm.

[0053] After mixing the near-infrared phosphor of Example 2 and the epoxy resin glu...

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Abstract

The near-infrared fluorescent powder with broadband emission and its preparation method and application belong to the technical field of luminescent materials. The problem that the bandwidth of the infrared light emitted by the infrared LED and the infrared laser in the prior art is very narrow is solved. Near infrared fluorescent powder of the present invention, chemical formula is: (R a ln b Ce c Cr d )(L e Cr g )(M k B m Cr n )O 12 ; In the formula, R is Ca 2+ 、Sr 2+ 、Ba 2+ One or more of, Ln is Lu 3+ , Y 3+ , La 3+ 、Gd 3+ One or more of, L is Hf 4+ and / or Zr 4+ , M is Al 3+ and / or Ga 3+ , B is Si 4+ and / or Ge 4+ ; a, b, c, d, e, g, k, m and n are all element mole fractions. The near-infrared phosphor can be used as a light conversion material for near-ultraviolet LED chips, blue-light LED chips and red-light LED chips to realize a near-infrared light source with broadband emission.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a near-infrared fluorescent powder with broadband emission and a preparation method and application thereof, in particular to an application of the fluorescent powder in preparing a near-infrared LED light source. Background technique [0002] The near-infrared light source is a light source with a wide range of applications. For example, in near-infrared face recognition technology, using a near-infrared light source as an active light source to illuminate the face, and then imaging through an infrared camera can overcome the impact of ambient light on imaging and improve the recognition rate. In addition, the non-destructive detection of oxygen content and hemoglobin content in the human body can be realized by utilizing the different absorption characteristics of hemoglobin in the human body to near-infrared light in oxygen-containing and oxygen-free ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/68C09K11/80C09K11/78H01L33/50
CPCC09K11/685C09K11/7708C09K11/7774C09K11/7776H01L33/502
Inventor 张亮亮张家骅郝振东张霞潘国徽武华君
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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