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Blue light excited Mn<4+> doped molybdate red luminescent material

A technology of blue light excitation and red light emission, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of low color rendering index, high color temperature, unsuitable for indoor lighting, etc., and achieve high luminous efficiency

Pending Publication Date: 2019-11-29
YUNNAN MINZU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of red components, this kind of phosphor has many disadvantages such as high color temperature and low color rendering index, so it is not suitable for indoor lighting.

Method used

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  • Blue light excited Mn&lt;4+&gt; doped molybdate red luminescent material
  • Blue light excited Mn&lt;4+&gt; doped molybdate red luminescent material
  • Blue light excited Mn&lt;4+&gt; doped molybdate red luminescent material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh 7.25 grams of ammonium molybdate and 0.62 grams of potassium hexafluoromanganate and dissolve them in 50ml of hydrofluoric acid (40wt%), stir at room temperature for 60 minutes until completely dissolved, then add 34.76 grams of potassium fluoride to the solution and react for 3 hours . The resulting precipitate was washed 3 times with absolute ethanol and glacial acetic acid, and finally dried in a vacuum oven for 24 hours. The orange-red powder obtained was the final product K 2 (MoO 2 f 4 )H 2 O:Mn 4+ .

[0017] The XRD diffraction pattern of this fluorescent powder is attached figure 1 As shown, the diffraction peaks of the sample are consistent with the matrix K 2 (MoO 2 f 4 )H 2 The O standard card JCPDS 73-2350 is completely consistent, and no diffraction peaks of any heterogeneous phases are observed, which shows that the samples we synthesized are of high purity and have a triclinic crystal structure.

[0018] figure 2 shown as K 2 (MoO 2 f ...

Embodiment 2

[0022] Weigh 7.73 grams of ammonium molybdate and 0.31 grams of potassium hexafluoromanganate and dissolve them in 40 ml of hydrofluoric acid (40 wt%), stir at room temperature for 50 minutes until they are completely dissolved, then add 34.86 grams of potassium fluoride and React for 4 hours. The resulting precipitate was washed 3 times with absolute ethanol and glacial acetic acid, and finally dried in a vacuum oven for 24 hours. The orange-red powder obtained was the final product K 2 (MoO 2 f 4 )H 2 O:Mn 4+ .

Embodiment 3

[0024] Weigh 7.25 grams of ammonium molybdate and 0.62 grams of potassium hexafluoromanganate and dissolve them in 40 ml of hydrofluoric acid (40 wt%), stir at room temperature for 60 minutes until completely dissolved, then add 34.86 grams of potassium fluoride to the solution to react 6 hours. The resulting precipitate was washed 3 times with absolute ethanol and glacial acetic acid, and finally dried in a vacuum oven for 24 hours. The orange-red powder obtained was the final product K 2 (MoO 2 f 4 )H 2 O:Mn 4+ .

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Abstract

Relating to the field of inorganic functional materials, the invention discloses a blue light excited Mn<4+> doped molybdate red luminescent material and a synthesis method thereof. The chemical composition of the blue light excited Mn<4+> doped molybdate red luminescent material is K2(Mo1-xO2F4)H2O:xMn<4+>, wherein x is the molar percentage coefficient of the correspondingly doped Mn<4+> ion relative to Mo<6+> ion, and x is greater than 0 and less than or equal to 0.20. The red luminescent material disclosed by the invention is based on emission of red light about 627nm under the excitation of blue light, and has high luminescent efficiency. The preparation method of the blue light excited Mn<4+> doped molybdate red luminescent material is liquid phase method, is carried out at normal temperature, has a simple synthesis process, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention relates to a blue-light-excited Mn-doped 4+ The invention discloses a molybdate red luminescent material and a preparation method thereof, which belong to the field of synthesis of inorganic functional materials. Background technique [0002] In contemporary lighting systems, phosphors, as the core component of white light diodes (LEDs), are widely used in lighting due to their advantages of high efficiency, long life, energy saving, and environmental protection. However, due to the lack of red components, this type of phosphor has many disadvantages such as high color temperature and low color rendering index, so it is not suitable for indoor lighting. Most red luminescent materials based on fluoride have many kinds of activators, such as Mn 4+ , Mn 2+ Wait. Doped with Mn 4+ The red phosphor powder is low in cost, environmentally friendly and pollution-free, and emits a strong peak in the red light region, which makes up for the dis...

Claims

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Application Information

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IPC IPC(8): C09K11/68
CPCC09K11/681
Inventor 汪正良刘艳周强王凯民唐怀军罗利军郭俊明
Owner YUNNAN MINZU UNIV