A kind of red luminous ceramic and its preparation method and application

A technology of red luminescence and ceramics, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., and can solve the problems of poor stability and low light efficiency of phosphors

Active Publication Date: 2021-08-20
INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the objectives of the present invention includes providing a red luminous ceramic, which has high thermal conductivity and can effectively solve the problems of low luminous efficiency and poor stability of phosphors excited by a high energy density light source

Method used

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  • A kind of red luminous ceramic and its preparation method and application
  • A kind of red luminous ceramic and its preparation method and application

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preparation example Construction

[0023] The preparation method of the red luminescent ceramics of the present application comprises the following steps: putting the reaction raw materials in a vacuum sintering device (such as a vacuum sintering furnace), -3 Under the condition of Pa, the temperature is raised to 180-220°C for the first time, and the first time is kept for 1-5h, and then the temperature is raised to 500-700°C for the second time, and the second time is kept for 4-12h.

[0024] In some embodiments, the degree of vacuum can be specifically set to 1.5×10 -3 Pa or 2×10 -3 Pa et al.

[0025] In some embodiments, the temperature for the first heating can be 180°C, 190°C, 200°C, 210°C or 220°C, etc., or 185°C, 195°C, 205°C, or 215°C, etc., or 180°C. Any temperature value within the range of -220°C. The time for the first heat preservation can be 1h, 2h, 3h, 4h, or 5h, etc., or 1.5h, 2.5h, 3.5h, or 4.5h, etc., or any time value within the range of 1-5h. It is worth noting that, in this application...

Embodiment 1

[0039] Weigh K 2 Ti 0.94 f 6 :0.06Mn 4+ 30g of the powder is used as the reaction raw material, and the raw material is ball milled and mixed for 48 hours. After mixing evenly, the raw material is dried in a blast drying oven at 60°C for 48 hours, and then passed through a 200-mesh sieve; the sieved raw material is put into a graphite mold , dry pressing with a pressure of 20MPa first, and then put it into a vacuum sintering furnace at a vacuum degree of 2×10 -3 Under the condition of Pa, raise the temperature to 200°C, keep it warm for 2 hours, then raise the temperature to 700°C, and pass in argon until the pressure reaches 9.8MPa, keep it warm for 8 hours, and get a sintered body after cooling to room temperature; grind and polish the sintered body After that, get Mn 4+ Activated red luminous ceramic.

[0040] The XRD pattern of the red luminescent ceramic is as follows figure 1 Its excitation and emission spectra at room temperature (25°C) are shown in figure 2 As ...

Embodiment 2

[0042] Weigh Na 2 Ti 0.95 f 6 :0.05Mn 4+ 30g of the powder is used as the reaction raw material, and the raw material is ball milled and mixed for 30 hours. After mixing evenly, the raw material is dried in a blast drying oven at 60°C for 24 hours, and then passed through a 200-mesh sieve; the sieved raw material is put into a graphite mold , first dry pressed with a pressure of 10MPa, and then put into a vacuum sintering furnace at a vacuum degree of 2×10 -3 Under the condition of Pa, raise the temperature to 200°C, keep it warm for 3 hours, then raise the temperature to 600°C, and pass in argon until the pressure reaches 9.8MPa, keep it warm for 10 hours, and cool to room temperature to get a sintered body; grind and polish the sintered body After that, get Mn 4+ Activated red luminous ceramic.

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Abstract

The invention provides a red luminescent ceramic and its preparation method and application, belonging to the technical field of luminescent materials. The red luminous ceramic is obtained by vacuum sintering of reaction raw materials. The reaction raw material is molecular formula A 2 B 1‑x f 6 :xMn 4+ powder, A includes Na or K, B includes any one of Si, Ge and Ti, 0.03≤x≤0.08. The red luminous ceramic has high thermal conductivity. The preparation method includes: heating the reaction raw materials in a vacuum sintering device for the first time to 180-220°C, keeping the temperature for 1-5h for the first time, then raising the temperature to 500-700°C for the second time, and keeping the temperature for 4-12h for the second time. The method has simple process, low cost and is suitable for large-scale production. The red luminescent ceramic can be used in the fields of high-power LED lighting and display, laser lighting and display, and the like.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a red luminescent ceramic and its preparation method and application. Background technique [0002] Under the background of the world's increasingly tense energy and prominent environmental problems, countries all over the world are strengthening the development of energy-saving and efficient green energy technologies. Because semiconductor lighting sources have the advantages of energy saving and environmental protection, high potential luminous efficiency, long life, and small size, etc. , is the green light source with the most development potential, and it has become the consensus of all countries in the world to vigorously develop the semiconductor lighting industry. With the advancement of science and technology, in recent years, research on semiconductor lighting devices based on high-energy-density light sources such as high-power blue light-emit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/553C04B35/622C09K11/67C09K11/66C09K11/61
CPCC04B35/553C04B35/622C04B2235/656C04B2235/6567C04B2235/658C04B2235/6581C04B2235/9661C09K11/616C09K11/665C09K11/675
Inventor 张秋红倪海勇林利添姜伟丁建明丁建红李许波
Owner INST OF RESOURCES UTILIZATION & RARE EARTH DEV GUANGDONG ACAD OF SCI
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