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A kind of dtab-assisted red fluorescent powder for enhancing luminous performance and preparation method thereof

A technology for red phosphor powder and luminescence performance, applied in the field of red phosphor powder and its preparation, can solve the problems of inability to achieve warm white light emission, low luminescence performance of phosphor powder, and no fluorescent powder found, so as to improve luminescence performance and luminescence performance Enhance and improve the effect of product purity

Active Publication Date: 2021-03-23
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the most commonly used white LED on the market has a low color rendering index due to the lack of red light components, and cannot achieve warm white light emission. Lithium gadolinium molybdate has a scheelite structure, which belongs to double molybdate, and has high physical and chemical stability.
It has been found that LiGd(MoO2) synthesized by hydrothermal method 4 ) 2 : 15% Eu 3+ The red phosphor can be effectively excited by the blue light chip, but the luminescence performance of the phosphor synthesized by the hydrothermal method is generally not high, so we are eager to find a method that can effectively improve the luminescence performance of the phosphor to improve the weak luminescence performance Defects
[0003] At present, there is no report on the method of improving the performance of the phosphor by surfactant-assisted hydrothermal synthesis. This method effectively improves the luminescence performance of the phosphor, which provides an important idea for follow-up research, and so far no research on the phosphor has been found. to report

Method used

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  • A kind of dtab-assisted red fluorescent powder for enhancing luminous performance and preparation method thereof
  • A kind of dtab-assisted red fluorescent powder for enhancing luminous performance and preparation method thereof
  • A kind of dtab-assisted red fluorescent powder for enhancing luminous performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Using Gd(NO 3 ) 3 ·6H 2 O. Li 2 MoO 4 and Eu(NO 3 ) 3 As a reaction raw material, weigh 2.975mmolGd(NO 3 ) 3 6H 2 O and 7mmolLi 2 MoO 4 and 0.525mmol Eu(NO 3 ) 3 ;

[0034] (2) Gd(NO 3 ) 3 ·6H 2 O solid powder was dissolved in deionized water, and then Eu(NO 3 ) 3 solution to obtain solution A; the Li 2 MoO 4 The solid powder was dissolved in deionized water to obtain solution B;

[0035] (3) Add solution A dropwise to solution B, and stir on a magnetic device at room temperature for 60 minutes to obtain a mixed milky white solution; use LiOH solution and dilute HNO 3 Adjust the pH of the mixed milky white solution to 7 to obtain solution C, add DTAB solid powder to solution C, and stir for 10 minutes to obtain a precursor solution. The concentration of DTAB in the precursor solution is 60mmol / L;

[0036] (4) Transfer the obtained precursor liquid into a p-polyphenylene-lined stainless steel reaction kettle, the volume filling degree of the reac...

Embodiment 2

[0040] (1) Using Gd(NO 3 ) 3 ·6H 2 O. Li 2 MoO 4 and Eu(NO 3 ) 3 As a reaction raw material, weigh 2.975mmolGd(NO 3 ) 3 6H 2 O and 7mmolLi 2 MoO 4 and 0.525mmol Eu(NO 3 ) 3 ;

[0041] (2) Gd(NO 3 ) 3 ·6H 2 O solid powder was dissolved in deionized water, and then Eu(NO 3 ) 3 solution to obtain solution A; the Li 2 MoO 4 The solid powder was dissolved in deionized water to obtain solution B;

[0042] (3) Add solution A dropwise to solution B, and stir on a magnetic device at room temperature for 60 minutes to obtain a mixed milky white solution; use LiOH solution and dilute HNO 3 Adjust the pH of the mixed milky white solution to 7 to obtain solution C, add DTAB solid powder to solution C, and stir for 10 minutes to obtain a precursor solution. The concentration of DTAB in the precursor solution is 60mmol / L;

[0043] (4) Transfer the obtained precursor liquid into a p-polyphenylene-lined stainless steel reaction kettle, the volume filling degree of the reac...

Embodiment 3

[0047] (1) Using Gd(NO 3 ) 3 ·6H 2 O. Li 2 MoO 4 and Eu(NO 3 ) 3 As a reaction raw material, weigh 2.975mmolGd(NO 3 ) 3 6H 2 O and 7mmolLi 2 MoO 4 and 0.525mmol Eu(NO 3 ) 3 ;

[0048] (2) Gd(NO 3 ) 3 ·6H 2 O solid powder was dissolved in deionized water, and then Eu(NO 3 ) 3 solution to obtain solution A; the Li 2 MoO 4 The solid powder was dissolved in deionized water to obtain solution B;

[0049] (3) Add solution A dropwise to solution B, and stir on a magnetic device at room temperature for 60 minutes to obtain a mixed milky white solution; use LiOH solution and dilute HNO 3 Adjust the pH of the mixed milky white solution to 7 to obtain solution C, add DTAB solid powder to solution C, and stir for 10 minutes to obtain a precursor solution. The concentration of DTAB in the precursor solution is 60mmol / L;

[0050] (4) Transfer the obtained precursor liquid into a p-polyphenylene-lined stainless steel reaction kettle, the volume filling degree of the reac...

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Abstract

The invention discloses red fluorescent powder with DTBA auxiliary enhanced luminous performance and a preparation method of the red fluorescent powder. The general chemical formula of the fluorescentpowder is LiGd<0.85>(MoO<4>)<2>:15% Eu<3+>, according to the stoichiometric ratio of Gd, Mo and Eu elements in the general formula, required medicine is weighted, an intermediate product is obtainedby a hydrothermal method, and finally the red fluorescent powder with the significantly enhanced luminous performance is obtained by calcining at 650 DEG C; an excitation spectrum and an emission spectrum show that after the surfactant DTAB is added, the luminous intensity is more than twice as high as when the surfactant DTAB is not added, in the range of 350-500 nm, the fluorescent powder has avery high excitation peak at 465 nm, it is indicated that the fluorescent powder can further be effectively excited by blue light, and absorption of the fluorescent powder to ultraviolet light is alsosignificantly improved compared with that without the surfactant. According to the synthesized fluorescent powder, the luminous performance of the red fluorescent powder which can be effectively excited by the blue light is successfully and effectively improved, and important ideas are provided for follow-up study.

Description

technical field [0001] The invention relates to the field of rare earth luminescent materials, in particular to a red fluorescent powder with DTAB-assisted enhancement of luminescent performance and a preparation method thereof. Background technique [0002] The fourth-generation lighting source white LED has many characteristics such as high color rendering index, energy saving, environmental protection, and long life, so it is widely used in various lighting and display fields. At present, the most commonly used white LED on the market has a low color rendering index due to the lack of red light components, and cannot achieve warm white light emission. Lithium gadolinium molybdate has a scheelite structure, which belongs to double molybdate, and has high physical and chemical stability. It has been found that LiGd(MoO2) synthesized by hydrothermal method 4 ) 2 : 15% Eu 3+ The red phosphor can be effectively excited by the blue light chip, but the luminescence performanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78
CPCC09K11/7794
Inventor 刘运王蓉刘丁菡白少杰朱毅叶森
Owner SHAANXI UNIV OF SCI & TECH