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Rare earth-doped NaLaMgTeO6-based green fluorescent powder and preparation method thereof

A green phosphor, rare earth doping technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problem that the luminous intensity and color rendering of green powder cannot meet the needs of use well, and achieve easy availability of raw materials and sintering. The effect of low temperature and simple process

Inactive Publication Date: 2015-06-10
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Green powder adopts Ce 3+ As a sensitizer, this is due to the Tb in most matrices 3+ The 4f-5d absorption peak cannot match with the 254 mercury lamp ultraviolet light excitation, and the Ce 3+ It has strong absorption at 254nm, and emits long-wave ultraviolet light in the range of 330-500nm, and effectively transfers the absorbed energy to Tb through non-radiative energy transfer 3+ ; At present, the luminous intensity and color rendering of commercial green powder can not meet the needs of use
[0006] The present invention adopts NaLaMgTeO 6 As a matrix material, a NaLaMgTeO was designed and prepared 6 :Tb 3+ New optoelectronic material for LED, this kind of phosphor has not been reported yet

Method used

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  • Rare earth-doped NaLaMgTeO6-based green fluorescent powder and preparation method thereof
  • Rare earth-doped NaLaMgTeO6-based green fluorescent powder and preparation method thereof
  • Rare earth-doped NaLaMgTeO6-based green fluorescent powder and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0030] 1) Select commercially available Na 2 CO 3 , La 2 o 3 , TeO 2 , Mg(NO 3 ) 2 ·6H 2 O and Tb 4 o 7 As a reaction raw material, according to the chemical formula NaLa 0.99 MgTeO 6 : 0.01Tb 3+ The stoichiometric ratio of each raw material was weighed;

[0031] 2) Put the raw materials weighed in step 1) into the mortar, add ethanol to the mortar, the amount of ethanol can make the raw materials in the mortar fully grind and mix evenly;

[0032] 3) Co-precipitate the homogeneously mixed raw materials with the ethanol system, and dry the precipitate in an oven at 100°C for 3 hours;

[0033]4) Put the dried mixture into a corundum crucible, place the crucible in a high-temperature furnace, raise the temperature to 300°C at a rate of 2°C / min, then raise the temperature to 1100°C at a rate of 5°C / min, keep it warm for 4 hours, and then cool To room temperature promptly obtains green fluorescent powder NaLa of the present invention 0.99 MgTeO 6 : 0.01Tb 3+ .

Embodiment 2

[0035] 1) Select commercially available Na 2 CO 3 , La 2 o 3 , TeO 2 , Mg(NO 3 ) 2 ·6H 2 O and Tb 4 o 7 As a reaction raw material, according to the chemical formula NaLa 0.97 MgTeO 6 : 0.03Tb 3+ The stoichiometric ratio of each raw material was weighed;

[0036] 2) Put the raw materials weighed in step 1) into the mortar, add ethanol to the mortar, the amount of ethanol can make the raw materials in the mortar fully grind and mix evenly;

[0037] 3) Co-precipitate the homogeneously mixed raw materials with the ethanol system, and dry the precipitate in an oven at 120°C for 5 hours;

[0038] 4) Put the dried mixture into a corundum crucible, place the crucible in a high-temperature furnace, raise the temperature to 300°C at a rate of 3°C / min, then raise the temperature to 1200°C at a rate of 3°C / min, keep it warm for 4 hours, and then cool To room temperature promptly obtains green fluorescent powder NaLa of the present invention 0.97 MgTeO 6 : 0.03Tb 3+ .

Embodiment 3

[0040] 1) Select commercially available Na 2 CO 3 , La 2 o 3 , TeO 2 , Mg(NO 3 ) 2 ·6H 2 O and Tb 4 o 7 As a reaction raw material, according to the chemical formula NaLa 0.95 MgTeO 6 : 0.05Tb 3+ The stoichiometric ratio of each raw material was weighed;

[0041] 2) Put the raw materials weighed in step 1) into the mortar, add ethanol to the mortar, the amount of ethanol can make the raw materials in the mortar fully grind and mix evenly;

[0042] 3) Co-precipitate the homogeneously mixed raw materials with the ethanol system, and dry the precipitate in an oven at 120°C for 3 hours;

[0043] 4) Put the dried mixture into a corundum crucible, place the crucible in a high-temperature furnace, raise the temperature to 300°C at a rate of 3°C / min, then raise the temperature to 1200°C at a rate of 5°C / min, keep it warm for 5 hours, and then cool To room temperature promptly obtains green fluorescent powder NaLa of the present invention 0.95 MgTeO 6 : 0.05Tb 3+ .

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Abstract

The invention discloses rare earth-doped NaLaMgTeO6-based green fluorescent powder and a preparation method thereof. By adopting a high-temperature solid phase method, by taking a compound containing Na<+>, a compound containing La<3+>, a compound containing Te<4+>, a compound containing Mg<2+>, a compound containing Dy<3+> and a compound containing Tb<3+> as reaction raw materials, the raw materials are weighed in a stoichiometric ratio of a chemical formula NaLa(1-x)MgTeO6:xTb<3+>, wherein x is equal to 0.01-0.10. The NaLa(1-x)MgTeO6:xTb<3+> crystal prepared by the invention is good in development and good in powder morphology. The crystal excited by 365nm ultraviolet rays emits green characteristic light, is high in light emitting intensity and emits light in a wide spectrum and multiple peaks. The emission peak covers red, green and blue wide areas of 485-625nm and green emission at the main peak of 547nm is represented.

Description

technical field [0001] The present invention relates to fluorescent powder and preparation method thereof, in particular to a kind of NaLaMgTeO 6 as the matrix, single doped rare earth Tb 3+ A fluorescent powder for LEDs capable of realizing green characteristic light emission by ions and a preparation method thereof. Background technique [0002] White LED is known as the fourth-generation lighting source, which has significant energy-saving prospects and a huge application market. Among them, fluorescent conversion phosphor is the mainstream direction of white LED development in the future. [0003] At present, there are two main technical solutions for white light LEDs. In addition to multi-chip combination to achieve white light emission, more methods are adopted to combine single chip with phosphor powder. Among them, blue LED chip with yellow phosphor powder is the most mainstream and the most mature technology. However, due to its insufficient color rendering, its p...

Claims

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Application Information

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IPC IPC(8): C09K11/88
Inventor 史永胜陈思秋宁青菊
Owner SHAANXI UNIV OF SCI & TECH
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