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a mn 4+ Doped tungstate red phosphor and preparation method thereof

A technology of red phosphor and tungstate, which is applied in the field of phosphor, can solve the problems of weak luminous intensity, unstable physical properties, and low output of phosphor, and achieve the effects of low manufacturing cost, excellent luminous performance, and stable luminous spectrum

Active Publication Date: 2020-08-25
SHANGHAI INST OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

mn 4+ Doped fluoride red phosphor has become a new research direction due to its narrow-band emission of red light, excitation by ultraviolet and blue light, and cheap raw materials. HF, and the physical properties are not stable
Therefore, researchers at home and abroad have studied Mn 4+ A lot of research work has been carried out on doped oxide red phosphors. At present, the preparation of Mn 4+ The method of doping oxide red phosphor includes solid phase reaction method, hydrothermal method, sol-gel method, etc., but the luminous intensity of the phosphor prepared by the above method is weak
Currently, there is no method to prepare Mn using Al reduction method 4+ Doped (CaO, SrO, BaO)-(WO 3 , MoO 3 , SiO 2 ,TiO 2 , GeO 2 )-MnO2 System Red Phosphor Powder Report

Method used

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  • a mn <sup>4+</sup> Doped tungstate red phosphor and preparation method thereof
  • a mn <sup>4+</sup> Doped tungstate red phosphor and preparation method thereof

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preparation example Construction

[0022] The invention provides a Mn 4+ The preparation method of the doped tungstate red fluorescent powder comprises the following steps:

[0023] (1) First weigh a certain quality of raw material powder, put it in an agate mortar and grind it for 30-60 minutes, then put it into a quartz crucible, and heat it in a high-temperature furnace at 1250-1300°C for 4-10 hours through solid-state reaction. Cool to room temperature to prepare a precursor, wherein the composition of the powder raw material is (in terms of oxide mass percentage): 0%3 +WO 3 +SiO2 2 +TiO 2 + GeO 2 ≤57.95%, 0%2 ≤0.14%;

[0024] (2) Weigh the Al powder and precursor according to the mass ratio of Al powder to precursor (0.03-1): 1, place Al powder and precursor in a crucible boat respectively, and place them in a vacuum tube furnace. After the system is evacuated to less than 0.1MPa, heat treatment is carried out at 0-900°C, and after reduction for 6 hours, it is naturally cooled to room temperature to o...

Embodiment 1

[0030] (1) First weigh a certain quality of raw material powder (CaO=0.4213g, WO 3 =0.5776g, MnO 2 =0.0011g), put it in an agate mortar and grind for 30-60min, then put it into a quartz crucible, heat it in a high-temperature furnace at 1250-1300°C for 4-10h through solid-state reaction, and cool to room temperature to obtain the precursor .

[0031] (2) Weigh 0.3g of Al powder and 1g of the precursor, place the Al powder and the precursor in a crucible boat respectively, and place them in a vacuum tube furnace. After the whole system is evacuated to less than 0.1MPa, the , heat treatment, after reduction for 6h, naturally cooled to room temperature, that is, to obtain Mn 4+ Doped tungstate red phosphor. During the whole preparation process, the Al powder and the precursor are always separated without contact, and the crucible boats are placed parallel to the left and right in the vacuum tube furnace, and the distance between the centers of the crucible boats placed in para...

Embodiment 2

[0033] (1) First weigh a certain quality of raw material powder (SrO=0.5736g, WO 3 =0.4256g, MnO 2 =0.0008g), put it in an agate mortar and grind for 30-60min, then put it into a quartz crucible, heat it in a high-temperature furnace at 1250-1300°C for 4-10h through solid-state reaction, and cool to room temperature to obtain the precursor .

[0034] (2) Weigh 0.3g of Al powder and 1g of precursor, place Al powder and precursor in a crucible boat respectively, and place them in a vacuum tube furnace. After the whole system is evacuated to less than 0.1MPa, the , heat treatment, after reduction for 6h, naturally cooled to room temperature, that is, to obtain Mn 4+ Doped tungstate red phosphor. During the whole preparation process, the Al powder and the precursor are always separated and not in contact, and the crucible boats are placed in parallel to the left and right in the vacuum tube furnace, and the mutual center distance of the crucible boats placed in parallel to the ...

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Abstract

The invention discloses a Mn<4+> doped tungstate red fluorescent powder and a preparation method of the Mn<4+> doped tungstate red fluorescent powder. The red fluorescent powder uses an Al powder as areducing agent, the Al powder is subjected to the non-contact reduction treatment, the luminescence property is excellent, and the red fluorescent powder can be well applied to a white light LED device; the fluorescent powder is a (CaO, SrO, BaO)-(WO3, MoO3, SiO2, TiO2, GeO2)-MnO2 system and is a brand new ultraviolet excitation red fluorescent powder. The system ingredient does not contain the rare earth element, the manufacturing cost of the fluorescent powder is low, the preparation method adopts remote reduction of the Al powder, has the advantages of safety, high efficiency and energy conservation, effectively regulates the spectrum of the fluorescent powder, and greatly improves the quantum efficiency of the fluorescent powder.

Description

technical field [0001] The invention relates to the technical field of fluorescent powder, in particular to a Mn 4+ Doped tungstate red phosphor and preparation method thereof. Background technique [0002] White light LED has significant advantages such as low power consumption, high efficiency, green environmental protection, energy saving, long life, small size, fast response, and good color rendering. The social and economic benefits have been widely concerned by the industry. [0003] Generally speaking, there are three paths for LEDs to achieve white light emission: the first is to mix and use three colors of LED light; the second is to use ultraviolet LED lights to excite three phosphors of red, green and blue, and mix the light of these three phosphors into white light ; The third is the use of blue LEDs and corresponding blue-light-excited yellow phosphors. At present, the third way to achieve white light has been commercialized, using InGaN chips emitting 450-47...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/68
CPCC09K11/684Y02P20/10
Inventor 侯京山潘彩霞房永征赵国营刘玉峰蒋广翔刘宇畅井天奇
Owner SHANGHAI INST OF TECH
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