Double-perovskite tungsten molybdate red fluorescent powder for white light LED and preparation method of double-perovskite tungsten molybdate red fluorescent powder

A technology of red phosphor and double perovskite, applied in chemical instruments and methods, luminescent materials, sustainable buildings, etc., can solve problems such as difficulty in obtaining red light emission, increased process cost, and low luminous efficiency, and achieve increased lumens Efficiency, increase luminous intensity, increase the effect of doping concentration

Active Publication Date: 2015-02-25
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, when the radius is relatively large Ca 2+ for B Ⅰ When ion, Eu 3+ ions readily access the highly symmetric B Ⅰ position, making it difficult to obtain pure red light emission; and when using Mg with a relatively small radius 2+ for B Ⅰ When ions are

Method used

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  • Double-perovskite tungsten molybdate red fluorescent powder for white light LED and preparation method of double-perovskite tungsten molybdate red fluorescent powder
  • Double-perovskite tungsten molybdate red fluorescent powder for white light LED and preparation method of double-perovskite tungsten molybdate red fluorescent powder
  • Double-perovskite tungsten molybdate red fluorescent powder for white light LED and preparation method of double-perovskite tungsten molybdate red fluorescent powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1), with BaCO 3 , La 2 o 3 , Li 2 CO 3 , Eu 2 o 3 , (NH 4 ) 6 Mo 7 o 24 4H 2 O is the raw material, according to BaLa 0.9 LiMoO 6 :0.1Eu 3+ Stoichiometric ratio for weighing;

[0034] 2), the weighed BaCO 3 and Li 2 CO 3 Pour into beaker A and dissolve completely with dilute nitric acid to obtain solution A; then put La in beaker B 2 o 3 and Eu 2 o 3 Dissolve with concentrated nitric acid, heat to drive off excess nitric acid, pour the solution in beaker B into beaker A and mix well;

[0035] 3), in beaker C, dissolve citric acid completely with deionized water to obtain citric acid solution, the amount of substance of citric acid and Ba 2+ , La 3+ 、Eu 3+ , Li + The ratio of the sum of the amounts of ionic substances, that is, the molar ratio, is 1:1. Add the configured citric acid solution into beaker A, and magnetically stir and mix evenly at room temperature to obtain solution C;

[0036] 4) Dissolve completely in deionized water in beaker D ...

Embodiment 2

[0043] 1), with SrCO 3 , Sc 2 o 3 , Li 2 CO 3 , Eu 2 o 3 , (NH 4 ) 6 Mo 7 o 24 4H 2 O as raw material, according to SrLa 0.7 LiMoO 6 :0.3Eu 3+ Stoichiometric ratio for weighing;

[0044] 2), the weighed SrCO 3 and Li 2 CO 3 Pour into beaker A and dissolve completely with dilute nitric acid to obtain solution A. And use beaker B to put Sc 2 o 3 and Eu 2 o 3 Dissolve in concentrated nitric acid, heat to drive off excess nitric acid, then add to beaker A and mix;

[0045] 3), completely dissolve carpamine with deionized water in beaker C, the amount of the substance of carpamine and Sr 2+ 、Sc 3+ 、Eu 3+ , Li + The ratio of the sum of the amounts of the ions is 1:1, and the prepared carbamide solution is added to the beaker A, and magnetically stirred and mixed at room temperature to obtain a solution C;

[0046] 4) Dissolve completely in deionized water in beaker D (NH 4 ) 6 Mo 7 o 24 4H 2 0, then proceed to obtain mixed solution in the beaker A, adj...

Embodiment 3

[0051] 1), with BaCO 3 , Gd 2 o 3 , Li 2 CO 3 , Eu 2 o 3 , (NH 4 ) 10 W 12 o 41 as raw material, according to BaGd 0.95 LiWO 6 :0.05Eu 3+ Stoichiometric ratio for weighing;

[0052] 2), the weighed BaCO 3 and Li 2 CO 3 Pour into beaker A and dissolve completely with dilute nitric acid to obtain solution A. And use beaker B to Gd 2 o 3 and Eu 2 o 3 Dissolve in concentrated nitric acid, heat to drive off excess nitric acid, then add to beaker A and mix;

[0053]3), fully dissolve citric acid and EDTA with deionized water in beaker C, the ratio of the amount of both citric acid and EDTA is 1:1, the sum of the amount of citric acid and EDTA is equal to Ba 2+ 、Gd 3+ 、Eu 3+ , Li + The ratio of the sum of the amount of ion substances is 1:2, and the configured citric acid solution is added to the beaker A, and magnetically stirred and mixed at room temperature to obtain a mixed solution;

[0054] 4) Dissolve completely in deionized water in beaker D (NH 4 ) ...

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Abstract

The invention relates to double-perovskite tungsten molybdate red fluorescent powder for a white light LED and a preparation method of the double-perovskite tungsten molybdate red fluorescent powder. The chemical expression of the red fluorescent powder is AA<II>1-xLi<+>B<II>O6:xEu<3+>, wherein Eu<3+> is an active ion doped to an A<II> site, and the doping amount x is more than or equal to 0.01 and less than or equal to 0.6; A is any one of or a combination of more of divalent alkaline earth metal ions Ca<2+>, Sr<2+> and Ba<2+>; A<II> is any one of or a combination of more of trivalent rare-earth ions La<3+>, Gd<3+>, Y<3+> and Sc<3+>; B<II> is any one of or a combination of W<6+> and Mo<6+>; and the red fluorescent powder is prepared by adopting a low-temperature combustion method. The double-perovskite tungsten molybdate red fluorescent powder disclosed by the invention can be efficiently excited by near ultraviolet and blue light chips, the luminous efficiency is improved, the preparation process is simple, and the synthesis temperature is low, so that the double-perovskite tungsten molybdate red fluorescent powder is ideal red fluorescent powder suitable for the white light LED.

Description

technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, and in particular relates to a double perovskite tungstomolybdate red fluorescent powder for white LEDs and a preparation method thereof. Background technique [0002] White LED (Light Emitting Diode) has the characteristics of low energy consumption, small size, no pollution, high luminous efficiency, long life and fast reaction rate. Lighting source. [0003] Using phosphor conversion is the most common way to achieve white LEDs. Currently commercialized phosphor-converted white LEDs usually use InGaN blue chips with a wavelength of about 460nm to excite YAG:Ce 3+ The yellow light produced by the phosphor is mixed with the rest of the blue light to form white light. However, due to the lack of red light components, the white light produced by this combination has disadvantages such as poor color rendering and high color temperature. In addition, the use of ultraviole...

Claims

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Application Information

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IPC IPC(8): C09K11/78
CPCY02B20/00
Inventor 杨章富袁晶晶于芳芳王洋洋杨瑞费米刘银
Owner ANHUI UNIV OF SCI & TECH
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