Preparation method and product of a rare earth aluminate-based composite red luminescent material

A technology of red light-emitting and light-emitting materials, applied in the directions of light-emitting materials, chemical instruments and methods, etc., can solve problems such as performance not meeting practical application requirements, low light conversion efficiency, short afterglow time, etc., and achieve good afterglow effect and light color. Good performance, the effect of improving performance

Active Publication Date: 2020-11-27
JIANGNAN UNIV
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  • Application Information

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Problems solved by technology

Rare earth luminescent materials are generally composed of a matrix and a dopant. The matrix determines the lattice structure and the force of chemical bonds, and the doped metal ions can change the structure of the trap level. Studies have found that doping with different rare earth elements and alkaline earth metal elements It is determined that the luminous intensity and afterglow time can be improved to a certain extent, but the afterglow time is very short, and its performance cannot meet the requirements of practical applications
[0003] At present, the existing red luminescent materials have poor luminescence performance, low light conversion efficiency, poor color purity, and short afterglow time, which are difficult to meet the requirements of practical applications, so further research on red luminescent materials is of great significance

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  • Preparation method and product of a rare earth aluminate-based composite red luminescent material
  • Preparation method and product of a rare earth aluminate-based composite red luminescent material
  • Preparation method and product of a rare earth aluminate-based composite red luminescent material

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preparation example Construction

[0031] The preparation method of the rare earth aluminate-based composite red luminescent material of the present invention comprises the following process steps:

[0032] (1) Preparation of luminescent matrix-polydopamine complex: scheme 1, mix polydopamine particles, absolute ethanol, and rare earth aluminate luminescent materials in proportion, and disperse them by ultrasonic, ultrasonic frequency 40KHz, temperature 25, heat to 50~ 80°C and high-speed stirring for 30-60 minutes, after the reaction, filter, wash, and dry; Scheme 2: Mix dopamine hydrochloride, rare earth aluminate luminescent material, absolute ethanol, and trishydroxymethylaminomethane in proportion, and heat to 25 ~60°C and high-speed stirring for 1-5 hours, after the reaction, filter, wash, and dry at 60-120°C to obtain a luminescent matrix-polydopamine complex.

[0033] (2) Preparation of aluminate-based composite red luminescent material: Mix luminescent matrix-polydopamine complex, absolute ethanol, eth...

Embodiment 1

[0036] (1) Preparation of luminescent substrate-polydopamine complex: polydopamine particles, SrAl 2 o 4 Eu 2+ , Dy 3+, anhydrous ethanol at a ratio of 0.002:1:10, ultrasonically dispersed for 20 minutes, heated to 50°C and stirred at high speed for 30 minutes, filtered, washed and dried after reaction to obtain a luminescent matrix-polydopamine complex.

[0037] (2) Preparation of aluminate-based composite red luminescent material: Mix the luminescent matrix-polydopamine complex, light conversion agent, absolute ethanol, and ethylene glycol at a ratio of 1:0.01:10:5, and disperse them by ultrasonic for 20 minutes. Ultrasonic frequency 40KHz, temperature 25, heating to 60°C and high-speed stirring for 30 minutes, after reaction, filtering, washing, and drying at 80°C to obtain aluminate-based composite red luminescent material.

[0038] (3) Grinding of the luminescent material: pulverize the aluminate-based composite red luminescent material to obtain a powder with a partic...

Embodiment 2

[0051] (1) Preparation of luminescent substrate-polydopamine complex: dopamine hydrochloride, SrAl 2 o 4 Eu 2+ , Dy 3+ , anhydrous ethanol, and trishydroxymethylaminomethane were mixed in a ratio of 0.001:1:5:0.5, dispersed by ultrasonic for 30 minutes, heated to 30°C and stirred at high speed for 2 hours, filtered, washed, and dried after reaction to obtain a luminescent matrix - Polydopamine complex.

[0052] (2) Preparation of aluminate-based composite red luminescent material: Mix the luminescent matrix-polydopamine complex, light conversion agent, absolute ethanol, and ethylene glycol at a ratio of 1:0.03:10:8, and disperse them by ultrasonic for 30 minutes. Heating to 70°C and stirring at a high speed for 30 minutes, after the reaction, filtering, washing, and drying at 90°C to obtain an aluminate-based composite red luminescent material.

[0053] (3) Grinding of the luminescent material: pulverize the aluminate-based composite red luminescent material to obtain a po...

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Abstract

The invention discloses a preparation method and product of a rare-earth aluminate-based composite red luminescent material. The preparation method comprises the following steps: preparing a luminescent substrate-polydopamine compound, concretely mixing polydopamine particles, absolute ethyl alcohol and a rare-earth aluminate luminescent material, or mixing dopamine hydrochloride, a rare-earth aluminate luminescent material, absolute ethyl alcohol and tris(hydroxymethyl)aminomethane, and carrying out ultrasonic dispersing, heating, reacting, filtering, washing and drying; preparing an aluminate-based composite red luminescent material, concretely mixing the luminescent substrate-polydopamine compound, absolute ethyl alcohol, ethylene glycol and a light conversion agent; and grinding the luminescent material. According to the invention, excellent luminescent performance of the rare-earth aluminate and the characteristics of organic fluorescent powder are utilized, and the blue light-green light is converted to red light. The problem of difficult combination of an inorganic fluorescent material and an organic fluorescent material is solved by using polydopamine, and the performance of the red composite luminescent material is improved.

Description

technical field [0001] The invention belongs to the technical field, and in particular relates to a preparation method of a rare earth aluminate-based composite red luminescent material and a product thereof. Background technique [0002] At present, the practical application of long-lasting luminescent materials has good luminescent performance, and industrialized production has been realized in many fields, but they mainly emit blue light and yellow-green light, which are subject to narrow excitation wavelength range, short excitation wavelength and low afterglow time. Due to limitations, the research and development process of red fluorescent materials is slow, and the luminous effect is difficult to meet the requirements of industrial production. There are many kinds of luminescent red luminescent materials. Among them, organic fluorescent materials are instant luminescent materials. Once the light source is lost, the fluorescence effect will be lost. The other type is i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/02C09K11/80
CPCC09K11/025C09K11/7792
Inventor 朱亚楠薛昊龙葛明桥
Owner JIANGNAN UNIV
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