Preparation method and application of a green manganese-doped silicate fluorescent material

A fluorescent material and manganese doping technology, applied in the field of fluorescent materials, can solve the problems of long afterglow time, short afterglow time, low absorption intensity, etc., and achieve the effects of low equipment requirements, simple preparation process and improved thermal stability

Inactive Publication Date: 2021-10-12
BOHAI UNIV
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  • Claims
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Problems solved by technology

[0005] The purpose of the present invention is to provide a green manganese-doped fluorescent material for the problems of long afterglow time, low absorption intensity in near-ultraviolet and blue light excitation regions, and low quantum efficiency under 270nm and 420nm excitation. Preparation method and application of silicate fluorescent material, by including Zn in the raw material 2+ The compound reduces its stoichiometric ratio by 2%-15%, and is doped with manganese and nitrogen to replace zinc and oxygen respectively. After high-temperature solid-phase synthesis, a compound with high quantum efficiency, short afterglow time, excellent thermal stability and simple preparation method is obtained. Green fluorescent materials for ultraviolet and blue light excitation, and can be effectively used in fluorescent lamps and white LEDs

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  • Preparation method and application of a green manganese-doped silicate fluorescent material
  • Preparation method and application of a green manganese-doped silicate fluorescent material
  • Preparation method and application of a green manganese-doped silicate fluorescent material

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Embodiment 1

[0043] This embodiment provides a green manganese-doped silicate fluorescent material, the preparation of which includes the following steps:

[0044] (1) According to the chemical formula Zn 1.92 Mn 0.08 SiO 4 composition, reduce the ZnO in the experimental raw materials by 15% of its stoichiometric ratio, weigh 0.5983g ZnO, 0.0414g MnCO 3 , 0.2075gSiO 2 , grind for 30min, mix the raw materials evenly to obtain mixed powder;

[0045] (2) Put the mixed powder into a corundum crucible, put it into a tubular atmosphere furnace, raise the temperature to 800°C at a heating rate of 5°C / min, keep the temperature for 2 hours, and then raise the temperature to 1250 at a heating rate of 5°C / min. ℃, hold for 4h, then drop to 800°C at a rate of 5°C / min, hold for 2h, and finally drop to 500°C at a rate of 5°C / min, then cool to room temperature naturally, take out the obtained powder and grind it into powder. Obtain the desired phosphor material.

[0046] Figure 7 Shown is the XRD ...

Embodiment 2

[0048] This embodiment provides a green manganese-doped silicate fluorescent material, the preparation of which includes the following steps:

[0049] (1) According to the chemical formula Zn 1.92 Mn 0.08 SiO 3.9 N 0.1 composition, reduce the ZnO in the experimental raw materials by 15% of its stoichiometric ratio, weigh 0.5988g ZnO, 0.2505g SiO 2 , 0.0158gSi 3 N 4 and 0.0414gMnCO 3 , grind for 30min, mix the raw materials evenly to obtain mixed powder;

[0050] (2) Put the mixed powder into the corundum crucible, put it into the tube atmosphere furnace, and put it in the N 2 Under the atmosphere, the temperature was raised to 800°C at a heating rate of 5°C / min, kept for 2 hours, and then raised to 1250°C at a heating rate of 5°C / min, kept for 4 hours, and then a reducing gas H was introduced. 2 , drop to 800°C at a rate of 5°C / min, hold for 2 hours, and finally drop to 500°C at a rate of 5°C / min, then cool to room temperature naturally, take out the obtained powder an...

Embodiment 3

[0052] This embodiment provides a green manganese-doped silicate fluorescent material, the preparation of which includes the following steps:

[0053] (1) According to the chemical formula Zn 1.92 Mn 0.08 SiO 3.8 N 0.2 composition, reduce the ZnO in the experimental raw materials by 15% of its stoichiometric ratio, weigh 0.5993g ZnO, 0.2304g SiO 2 , 0.0317gSi 3 N 4 and 0.0415gMnCO 3 , grind for 30min, mix the raw materials evenly to obtain mixed powder;

[0054] (2) Put the mixed powder into the corundum crucible, put it into the tube atmosphere furnace, and put it in the N 2 Under the atmosphere, the temperature was raised to 800°C at a heating rate of 5°C / min, kept for 2 hours, and then raised to 1250°C at a heating rate of 5°C / min, kept for 4 hours, and then a reducing gas H was introduced. 2 , drop to 800°C at a rate of 5°C / min, hold for 2 hours, and finally drop to 500°C at a rate of 5°C / min, then cool to room temperature naturally, take out the obtained powder an...

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Abstract

The invention discloses a preparation method and application of a green manganese-doped silicate fluorescent material. The chemical formula of the fluorescent material is Zn 2 SiO 4‑y N y :xMn 2+ , where, 0.02≤x≤0.08, 0≤y≤1; 2+ The compound is reduced by 2%-15% of its stoichiometric ratio, and other raw materials are normally weighed according to the stoichiometric ratio, and prepared by high-temperature solid-phase synthesis. In the present invention, by doping manganese and nitrogen to replace zinc and oxygen respectively, a green fluorescent material for ultraviolet and blue light excitation with high quantum efficiency, short afterglow time, excellent thermal stability and simple preparation method can be obtained, and It can be effectively used in fluorescent lamps and white LEDs.

Description

technical field [0001] The invention relates to the field of fluorescent materials, in particular to a preparation method and application of a green manganese-doped silicate fluorescent material. Background technique [0002] As a new type of green and environmentally friendly solid lighting source, white LEDs are widely used in lighting and display fields due to their advantages of energy saving and environmental protection, high efficiency, long life, and fast response. As an important part of LED, fluorescent material emits visible light by absorbing ultraviolet, near ultraviolet or blue light. The quality of its luminous performance directly affects the luminous efficiency, display effect and service life of the light source. [0003] According to the principles of luminescence and photometry, white light can be formed by mixing red, blue, and green three primary colors, so there are three main ways to realize white LED at present: 1. Package red, green, and blue LED chi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/59H01L33/50
CPCC09K11/0883C09K11/595H01L33/502Y02B20/00
Inventor 王闯王建睿朱革辛双宇姜静李卓为周发光高淼
Owner BOHAI UNIV
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