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Fluorescent compound with pyrochlore structure lanthanum titanate as matrix and preparation method and application

A fluorescent compound and pyrochlore structure technology, applied in the field of fluorescent compounds, can solve the problems of lack of red emission components, insufficient color rendering index, and insufficient luminous intensity, etc., and achieve the effect of stable chemical properties

Active Publication Date: 2017-01-25
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the emission of single-matrix white light-emitting fluorescent materials generally has problems such as lack or insufficient red emission components, insufficient color rendering index, and insufficient luminous intensity.
In the La-Ti-O ternary system, there are no fluorescent compounds based on pyrochlore-structured lanthanum titanate, which have been reported in related reports.

Method used

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  • Fluorescent compound with pyrochlore structure lanthanum titanate as matrix and preparation method and application
  • Fluorescent compound with pyrochlore structure lanthanum titanate as matrix and preparation method and application
  • Fluorescent compound with pyrochlore structure lanthanum titanate as matrix and preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Pyrochlore structure lanthanum titanate-based fluorescent compound, the chemical formula is La 1.98 Dy 0.02 TiO 5 , made by the following steps:

[0045] (1) Weigh 1.98 mmol of lanthanum nitrate and 0.02 mmol of dysprosium acetate and dissolve them in deionized water to obtain solution A; weigh 1 mmol of tetrabutyl titanate and dissolve them in 50 mL of methanol to obtain solution B;

[0046] (2) Mix solution A and solution B, add 4 mmol acetic acid dropwise to make the pH<3, stir for 1 hour to obtain a clear solution C, raise the temperature of solution C to 50°C, and keep it in a water bath for 3 hours to obtain a precursor gel;

[0047] (3) Put the precursor gel in a corundum crucible, calcined in a muffle furnace, and calcined in an air atmosphere at a temperature of 1100° C., calcined for 4 hours, kept for 2 hours, and cooled to room temperature with the furnace to obtain a calcined product;

[0048] (4) The calcined product is pulverized, ground, passed through...

Embodiment 2

[0051] Pyrochlore structure lanthanum titanate-based fluorescent compound, the chemical formula is La 1.972 Dy 0.02 SM 0.008 TiO 5 , made by the following steps:

[0052] (1) Weigh 1.972mmol of lanthanum acetate, 0.02mmol of dysprosium carbonate and 0.008mmol of samarium acetate and dissolve them in deionized water to obtain solution A; weigh 1mmol of tetrabutyl titanate and dissolve them in 60mL of ethanol to obtain solution B;

[0053] (2) Mix solution A and solution B, add 30 mmol of carbonic acid dropwise to make the pH<3, stir for 2 hours to obtain a clear solution C, raise the temperature of solution C to 150°C, and keep it in a water bath for 6 hours to obtain a precursor gel;

[0054] (3) Put the precursor gel in a corundum crucible, calcined in a muffle furnace, and calcined in an air atmosphere at a temperature of 1200° C., calcined for 2 hours, kept for 3 hours, and cooled to room temperature with the furnace to obtain a calcined product;

[0055] (4) The calcin...

Embodiment 3

[0058] Pyrochlore structure lanthanum titanate-based fluorescent compound, the chemical formula is La 1.968 Dy 0.02 SM 0.012 TiO 5 , made by the following steps:

[0059] (1) Weigh 1.968 mmol of lanthanum carbonate, 0.02 mmol of dysprosium nitrate and 0.012 mmol of samarium nitrate and dissolve them in deionized water to obtain solution A; weigh 1 mmol of tetrabutyl titanate and dissolve them in 70 mL of propanol to obtain solution B;

[0060] (2) Mix solution A and solution B, add 25 mmol of nitric acid dropwise to make the pH<3, stir for 1.5 hours to obtain a clear solution C, raise the temperature of solution C to 60°C, keep it in a water bath for 4 hours, and obtain a precursor gel;

[0061] (3) Put the precursor gel in a corundum crucible, calcined in a muffle furnace, and calcined in an air atmosphere at a temperature of 900° C., calcined for 6 hours, kept for 4 hours, and cooled to room temperature with the furnace to obtain a calcined product;

[0062] (4) The calc...

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Abstract

The invention discloses a fluorescent compound using pyrochlore structure metatitanic acid lanthanum as a substrate. The general formula of the fluorescent compound is La2(1-x)M2xTiO5, wherein M is Dy and / or Sm, x is greater than or equal to 0.01, and x is less than or equal to 0.02. The preparation method comprises the following steps: dissolving the soluble salt La and the soluble salt of Sm and / or Dy in the deionized water, and obtaining solution A; mixing tetrabutyl titanate and alcohol to obtain solution B; mixing the solution A and the solution B, dripping acid and stirring to obtain solution C, rising the temperature of the solution to 50-150 DEG C and keeping the temperature, and obtaining precursor gel; roasting the precursor gel, and obtaining a calcined material; and smashing, grinding, washing and drying the calcined material, and obtaining the fluorescent compound, wherein the fluorescent compound can be used for preparing the luminescent material for white light LED. The fluorescent compound has the characters of good luminescent performance, high luminescent intensity, and better color rendering. The preparation method has the characters of low calcinations temperature, simple process and low cost, and is capable of satisfying the requirement of the white light LED illumination field.

Description

technical field [0001] The invention relates to a fluorescent compound with a pyrochlore structure lanthanum titanate as a matrix, a preparation method and an application, and belongs to the technical field of fluorescent compounds. Background technique [0002] White LED has the advantages of high energy efficiency, small size, long life, low pollution, etc., and is known as a new generation of "green lighting" light source. At present, white light LEDs are mainly realized through phosphor light conversion, including two types of light conversion, one is to effectively excite YAG:Ce through blue LED chips 3+ Yellow phosphor uses the combination of the blue light emitted by the chip and the yellow light emitted by the phosphor to form white light, but due to the lack of red light, the color rendering is poor, and the wavelength band of the phosphor doped with YAG is too narrow, concentrated in a certain range The other is to generate red, yellow, and blue colors into white ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78H01L33/50
CPCY02B20/00
Inventor 刘宣文齐建全马振伟白永一和朝阳张杨郭瑞
Owner NORTHEASTERN UNIV LIAONING
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