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Eu<3+>/Tb<3+>-doped LiSrPO4 fluorescent powder for W-LED and preparation method thereof

A phosphor powder, 3·5H2O technology, applied in chemical instruments and methods, luminescent materials, electrical components, etc., can solve the problems of fluorescence reabsorption and luminescence unevenness, the spectrum cannot completely cover the red light, and the color reabsorption is reduced, etc. Achieve the effect of promoting charge transfer transition, high luminous efficiency and low production cost

Inactive Publication Date: 2021-06-01
威海长和光导科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the W-LED device based on the mixture of multiple phosphors has problems such as fluorescence reabsorption and uneven luminescence, and the coating process of the method is complicated, the production cost is high, and the color reabsorption of the mixture of multiple phosphors reduces the luminous efficiency. New problems such as poor color stability
In recent years, researchers have proposed the idea of ​​using a single-matrix white-light phosphor to emit white light under ultraviolet light excitation. However, most phosphors prepared using a single-matrix emit blue or yellow light. The spectrum cannot completely cover red light, green light, and blue light, resulting in problems such as poor color rendering and low luminous efficiency

Method used

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  • Eu&lt;3+&gt;/Tb&lt;3+&gt;-doped LiSrPO4 fluorescent powder for W-LED and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The present invention provides a kind of preparation method of Eu3+ / Tb3+ doped LiSrPO4 fluorescent powder for W-LED, it comprises the following steps:

[0028] (1) According to the stoichiometric ratio of elements Li + : Sr 2+ : Eu 3+ :Tb 3+ :PO 4 3- In the ratio of 1:0.98:0.01:0.01:1, weigh the compound: LiNO 3 , Sr(NO3 ) 2 , Eu(NO 3 ) 3 ·5H 2 O, Tb(NO 3 ) 3 ·5H 2 O, (NH 4 ) 2 HPO 4 , mechanically ground and mixed uniformly to obtain a mixture;

[0029] (2) The mixture obtained in step 1) was dissolved in distilled water. Use a magnetic stirrer to stir the solution for 30 minutes, while stirring, add an appropriate amount of catalyst C 6 h 12 o 6 solution and heated at 100°C for 24 hours until a xerogel is formed;

[0030] (3) Calcining the xerogel obtained in step 2) in an electric furnace at 1000° C. for 1 hour;

[0031] (4) The calcined mixture obtained in step 3) is naturally cooled, and mechanically ground to obtain the phosphor.

Embodiment 2

[0033] (1) According to the stoichiometric ratio of elements Li + : Sr 2+ : Eu 3+ :Tb 3+ :PO 4 3- In the ratio of 1:0.97:0.02:0.01:1, weigh the compound: LiNO 3 , Sr(NO 3 ) 2 , Eu(NO 3 ) 3 ·5H 2 O, Tb(NO 3 ) 3 ·5H 2 O, (NH 4 ) 2 HPO 4 , mechanically ground and mixed uniformly to obtain a mixture;

[0034] (2) The mixture obtained in step 1) was dissolved in distilled water. Use a magnetic stirrer to stir the solution for 30 minutes, while stirring, add an appropriate amount of catalyst C 6 h 12 o 6 solution and heated at 100°C for 24 hours until a xerogel is formed;

[0035] (3) Calcining the xerogel obtained in step 2) in an electric furnace at 1000° C. for 1 hour;

[0036] (4) The calcined mixture obtained in step 3) is naturally cooled, and mechanically ground to obtain the phosphor.

Embodiment 3

[0038] (1) According to the stoichiometric ratio of elements Li + : Sr 2+ : Eu 3+ :Tb 3+ : PO 4 3- In the ratio of 1:0.89:0.1:0.01:1, weigh the compound: LiNO 3 , Sr(NO 3 ) 2 , Eu(NO 3 ) 3 ·5H 2 O, Tb(NO 3 ) 3 ·5H 2 O, (NH 4 ) 2 HPO 4 , mechanically ground and mixed uniformly to obtain a mixture;

[0039] (2) The mixture obtained in step 1) was dissolved in distilled water. Use a magnetic stirrer to stir the solution for 30 minutes, while stirring, add an appropriate amount of catalyst C 6 h 12 o 6 solution and heated at 100°C for 24 hours until a xerogel is formed;

[0040] (3) Calcining the xerogel obtained in step 2) in an electric furnace at 1000° C. for 1 hour;

[0041] (4) The calcined mixture obtained in step 3) is naturally cooled, and mechanically ground to obtain the phosphor.

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Abstract

The invention provides Eu<3+> / Tb<3+>-doped LiSrPO4 fluorescent powder for a W-LED and a preparation method thereof, and solves the technical problems of poor color rendering and low luminous efficiency of single-matrix white light fluorescent powder in the prior art. The chemical general formula of the fluorescent powder is LiSr (1-y-x)EuxTbyPO4, wherein 0.001 < = x < = 0.1, and 0.001 < = y < = 0.1. The invention also discloses a preparation method of the Eu<3+> / Tb<3+>-doped LiSrPO4 fluorescent powder for a W-LED. The fluorescent powde can be widely applied to the technical field of LED luminescent materials.

Description

technical field [0001] The invention belongs to the technical field of LED luminescent materials, in particular to a Eu 3+ / Tb 3+ Doped LiSrPO 4 Phosphor powder and its preparation method. Background technique [0002] In recent years, with the continuous development of the light-emitting diode (LED) industry, the field of white light LED (W-LED) lighting has begun to receive increasing attention. Compared with traditional incandescent lamps and fluorescent lamps, W-LED lighting sources have the advantages of high luminous efficiency, environmental friendliness, high brightness, good reliability, long life and low cost, and have attracted widespread attention in recent years. Near-ultraviolet (n-UV) LEDs are currently used, combined with multiple phosphors emitting in the red, green, and blue regions, to produce white light by adjusting the ratio of multiple phosphors. However, the W-LED device based on the mixture of multiple phosphors has problems such as fluorescence ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/71H01L33/50
CPCC09K11/7796H01L33/502
Inventor 陈卫东王传杰张鹏魏敏张桂林张明立
Owner 威海长和光导科技有限公司