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Molybdate-based red fluorescent powder, preparation method and application thereof

A citric acid and rare earth luminescent technology, which is applied in chemical instruments and methods, luminescent materials, etc., can solve the problem of rare earth luminescent materials, and achieve the effects of low synthesis cost, high physical and chemical stability, and low synthesis temperature

Inactive Publication Date: 2020-03-06
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no corresponding report on the rare earth luminescent material with luminescent properties obtained by using the citric acid solution combustion method at a relatively low synthesis temperature of 700 ° C for 1 hour.

Method used

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  • Molybdate-based red fluorescent powder, preparation method and application thereof
  • Molybdate-based red fluorescent powder, preparation method and application thereof
  • Molybdate-based red fluorescent powder, preparation method and application thereof

Examples

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preparation example Construction

[0045] The preparation method of the rare-earth luminescent material with luminescent properties: the following steps are carried out:

[0046] a. Raw material preparation: according to LiLa(MoO 4 ) 2 :xSm 3+ ,yAg + The stoichiometric ratio of each element in the formula is taken as Li 2 CO 3 (99.0%), La 2 o 3 (99.9%), AgNO 3 (99.0%), (NH 4 ) 6 Mo 7 o 24 4H 2 O (99.0%), C 6 h 8 o 7 (99.8%), Sm 2 o 3 (99.99%); wherein, 1%≤x≤9%, 0.5%≤y≤6%. ;

[0047] b. Take the good one from step a (NH 4 ) 6 Mo 7 o 24 4H 2 O is added with distilled water to prepare (NH 4 ) 6 Mo 7 o 24 solution, for use; the Sm taken in step a 2 o 3 , La 2 o 3 , Li 2 CO 3 Add dilute nitric acid to prepare Sm(NO 3 ) 3 , La(NO 3 ) 3 、LiNO 3 solution, stand-by; the AgNO taken in step a 3 Adding distilled water to prepare AgNO 3 solution, ready to use;

[0048] c. The AgNO prepared in step b 3 The solution was added to the prepared Sm(NO 3 ) 3 , La(NO 3 ) 3 、LiNO 3 solu...

Embodiment 1

[0073] Weigh 1.4124g (NH 4 ) 6 Mo 7 o 24 4H 2 O was prepared by adding 10 mL of distilled water (NH 4 ) 6 Mo 7 o 24 Solution, heated and stirred to 70°C, set aside; weighed Li 2 CO 3 , La 2 o 3 , Sm 2 o 3 Add 1.5mL of 40% dilute nitric acid to form a nitrate solution, heat and stir to 77°C, and set aside; weigh 2.304g of anhydrous citric acid and add it to the stirred nitrate solution, continue heating and stirring until a clear solution; prepare ( NH 4 ) 6 Mo 7 o 24 Put the solution into the prepared clear solution, heat and stir at 70°C for 1h to obtain a light yellow transparent gel-like precursor; roast the precursor in a muffle furnace at 700°C for 1h to obtain LiLa 1-x (MoO 4 ) 2 :xSm 3+ Phosphor.

[0074] SM 2 o 3 and La 2 o 3 The corresponding amount changes are shown in Table 1.

[0075] Table 1

[0076] LiLa(MoO 4 ) 2 :xSm 3+

Embodiment 2

[0078] On the basis of Example 1, change Li 2 CO 3 , AgNO 3 The amount of LiLa(MoO 4 ) 2 :0.05Sm 3+ ,yAg + Phosphor. The chemical formula of the product obtained is: LiLa(MoO 4 ) 2 :0.05Sm 3+ ,yAg + (y=0.5%-6%). AgNO 3 and Li 2 CO 3 The corresponding quantity changes are shown in Table 2.

[0079] Table 2

[0080]

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Abstract

Belonging to the technical field of rare earth functional materials, the invention relates to a molybdate-based red fluorescent powder, a preparation method and application thereof. The molybdate-based red fluorescent powder is a rare earth luminescent material with luminescent properties, the chemical formula of the rare earth luminescent material is LiLa(MoO4)2:xSm<3+>, yAg<+>, wherein x is greater than or equal to 1% and smaller than or equal to 9%, and y is greater than or equal to 0.5% and smaller than or equal to 6%. The molybdate-based red fluorescent powder prepared according to the invention has excellent luminescent properties, and Sm<3+> and Ag<+> ions are co-doped, so that the product becomes red fluorescent powder for white-light LED, and the luminescent properties are obviously enhanced.

Description

technical field [0001] The invention relates to a molybdate-based red fluorescent powder and a preparation method and application thereof, belonging to the technical field of rare earth functional materials. Background technique [0002] Rare earth luminescent materials usually use the host compound as the matrix, and a small amount of rare earth ions doped as the luminescence center as the activator. Some other impurity ions or rare earth ions can act as sensitizers, and then transfer the absorbed energy to the activator, thereby improving the luminescent performance. Most of the 4f shells of rare earth ions are not full, and when excited by ultraviolet or near-ultraviolet light, their 4f electrons will transition within or between configurations to release light of different colors. In addition, there are many kinds of rare earth ions, and different combinations of rare earth ions can synthesize other new luminescent materials. The rare earth luminescent material with a ...

Claims

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Application Information

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IPC IPC(8): C09K11/78
CPCC09K11/7776
Inventor 邱克辉周鹏乐露
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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