a cr 3+ Doped aluminum-rich magnesium aluminum spinel fluorescent transparent ceramics and preparation method thereof

A magnesia-aluminum spinel and transparent ceramic technology, which is applied in the preparation of ceramic materials and the preparation of chromium-doped aluminum-rich magnesia-aluminum spinel fluorescent transparent ceramics, can solve the problem of affecting the luminous efficiency of white light LEDs, restricting white light LEDs, red light The luminous efficiency and stability of phosphors cannot be compared with those of yellow and green phosphors, which can solve the problem of the decline of fluorescence performance, the conversion of heat dissipation and light efficiency, and the technical convenience and easy regulation.

Active Publication Date: 2021-01-26
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of these white LEDs use phosphors of different substrates, and the luminous efficiency and stability of red phosphors cannot be compared with yellow and green phosphors, which will still affect the luminous efficiency of white LEDs.
Therefore, no matter what method is currently used, the lack of red fluorescent components restricts white LEDs from obtaining better color temperature and color rendering.

Method used

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  • a cr <sup>3+</sup> Doped aluminum-rich magnesium aluminum spinel fluorescent transparent ceramics and preparation method thereof
  • a cr <sup>3+</sup> Doped aluminum-rich magnesium aluminum spinel fluorescent transparent ceramics and preparation method thereof
  • a cr <sup>3+</sup> Doped aluminum-rich magnesium aluminum spinel fluorescent transparent ceramics and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Mg 7.1 al 16.599 Cr 0.001 □ 0.3 o 32 Preparation of Fluorescent Transparent Ceramics

[0041] 1)MgAl 2 o 4 :Cr 3+ / Al 2 o 3 Preparation of multiphase ceramic green body: MgO, Al 2 o 3 、Cr 2 o 3 The powder is weighed according to the percentage of the amount of substance 1:0.9995:0.0005, and added to absolute ethanol, ball milled for 6 hours, and then the obtained slurry is fully dried to obtain a powder mixture, and a high-temperature solid-state reaction at 1300°C for 10 minutes is used to synthesize a single-phase stoichiometry MgAl 2 o 4 :Cr 3+ The ceramic powder; then the MgAl 2 o 4 :Cr 3+ and Al 2 o 3 The powder is weighed according to the percentage of substance amount 71:12, and added to absolute ethanol, ball milled for 6 hours, and the obtained slurry is fully dried to obtain a powder mixture, and a single-phase stoichiometric MgAl is synthesized by a high-temperature solid-state reaction 2 o 4 :Cr 3+ The ceramic powder is sieved, placed ...

Embodiment 2

[0045] Mg 6.5 Al 16.999 Cr 0.01 □ 0.5 o 32 Preparation of Fluorescent Transparent Ceramics

[0046] 1) Mg 8 Al 2 o 4 / Al 2 o 3 Preparation of multiphase ceramic green body: MgO, Al 2 o 3 、Cr 2 o 3 The powder is weighed according to the percentage of the amount of substance 1:0.995:0.005, and added to absolute ethanol, ball milled for 24 hours, and then the obtained slurry is fully dried to obtain a powder mixture, and a high-temperature solid-state reaction at 1300°C for 10 minutes is used to synthesize a single-phase stoichiometric MgAl 2 o 4 :Cr 3+ The ceramic powder; then the MgAl 2 o 4 :Cr 3+ and Al 2 o 3 The powder is weighed according to the percentage of substance amount 13:4, and added to absolute ethanol, ball milled for 24 hours, and the obtained slurry is fully dried to obtain a powder mixture, and a single-phase stoichiometric MgAl is synthesized by a high-temperature solid-state reaction 2 o 4 :Cr 3+ The ceramic powder is sieved, placed in a...

Embodiment 3

[0051] Mg 5.6 Al 17.584 Cr 0.016 □ 0.8 o 32 Preparation of Fluorescent Transparent Ceramics

[0052] 1)MgAl 2 o 4 :Cr 3+ / Al 2 o 3 Preparation of multiphase ceramic green body: MgO, Al 2 o 3 、Cr 2 o 3 The powder is weighed according to the percentage of substance amount 1:0.992:0.008, and added to absolute ethanol, ball milled for 24 hours, and then the obtained slurry is fully dried to obtain a powder mixture, and a high-temperature solid-state reaction at 1300°C for 10 minutes is used to synthesize a single-phase stoichiometric MgAl 2 o 4 :Cr 3+ The ceramic powder; then the MgAl 2 o 4 :Cr 3+ and Al 2 o 3 The powder is weighed according to the percentage of substance amount 7:4, and added to absolute ethanol, ball milled for 24 hours, and the obtained slurry is fully dried to obtain a powder mixture, and a single-phase stoichiometric MgAl is synthesized by a high-temperature solid-state reaction 2 o 4 :Cr 3+ The ceramic powder is sieved, placed in a ste...

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Abstract

The present invention relates to a Cr 3+ Doped aluminum-rich magnesium aluminum spinel fluorescent transparent ceramics and a preparation method thereof. It is a single-phase magnesium aluminum spinel structure with the structural formula Mg 8‑3y Al 16‑2x+2y Cr 2x □ y o 32 , where 0.0005≤x≤0.01, 0.3≤y≤1.5, □ is the number of octahedral vacancies. Preparation: First prepare MgAl by low temperature pre-sintering 2 o 4 :Cr 3+ Single-phase ceramic powder, then MgAl 2 o 4 :Cr 3+ and Al 2 o 3 The powder is pre-fired as raw material to prepare MgAl with the same chemical composition as aluminum-rich magnesium aluminum spinel fluorescent transparent ceramics 2 o 4 :Cr 3+ / Al 2 o 3 The sintered body with multi-phase and closed pores is then subjected to hot isostatic pressing treatment above the formation temperature of single-phase aluminum-rich magnesium-aluminum spinel. During this process, MgAl 2 o 4 and Al 2 o 3 Further solid-phase reaction occurred in the system. On the premise of ensuring the transmittance of the transparent ceramics, the invention realizes the adjustment and control of the fluorescent performance of the material through the change of the matrix, and improves the color rendering property of the material. Using fluorescent transparent ceramic bulk materials instead of organic glue to encapsulate powders can help solve the problems of heat dissipation and light efficiency conversion, and is expected to improve the stability of LED devices.

Description

technical field [0001] The invention relates to a method for preparing ceramic materials, in particular to a method for preparing chromium-doped aluminum-rich magnesium-aluminum spinel fluorescent transparent ceramics, which belongs to the field of fluorescent transparent block material preparation. Background technique [0002] As the application of white light emitting diodes (Light Emitting Diode, LED) in the field of lighting continues to expand, it has been widely used in fields such as display, transportation, and automobiles. However, as the power of LED chips continues to increase and LED light-emitting modules are highly integrated, the reliability and stability of high-power white LED products have become a bottleneck restricting product development. At present, the most widely used packaging method for white light LEDs is to coat the chip with phosphor powder and a layer of transparent adhesive layer (a mixture of epoxy resin and silica gel) with a relatively high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/443C04B35/626C04B35/645
Inventor 王皓左文杰
Owner WUHAN UNIV OF TECH
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