Light emitting diode (LED) fluorescent powder with single matrix white light excited by near ultraviolet and preparation method thereof

A phosphor, near-ultraviolet technology, applied in luminescent materials, chemical instruments and methods, the use of gas discharge lamps, etc., can solve problems such as difficulty in color matching, and achieve the effect of high color rendering index and fine and uniform particles

Inactive Publication Date: 2012-08-22
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, Sr reported by Sun Xiaoyuan et al. 2 MgSiO 5 :Eu 2+ , BaSrMg (PO 4 ) 2 :Eu 2+ And the Chinese patent publication A of application number 200910021829.9 1-x-y Dy x Bi y Mg 1-z Zn z al 11 o 19 (A=La, Ce, Y, Gd) phosphors belong to multi-site single-matrix phosphors. The emission spectrum of this type of phosphors is mixed with blue light and yellow light to form white light. Because there is only one activator, its color matching more difficult

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh LiNO 3 , Ca(NO 3 ) 2 4H 2 O, Tb(NO 3 ) 3 ·6H 2 O, Eu(NO 3 ) 3 ·6H 2 O, MnCO 3 Each 0.6895g, 2.1254g, 0.1360g, 0.0089g, 0.0553g, add an appropriate amount of dilute nitric acid to completely dissolve in deionized water to form a 0.1mol / L metal ion solution, add 2.1g citric acid and stir evenly for later use. Weigh 1.1503g of NH 4 h 2 PO 4 , dissolve in deionized water to form a 0.4mol / L solution, then add 0.2g of polyethylene glycol 20000 to the solution to form an anion solution, stir evenly; add the metal ion solution to a 85°C water bath at a rate of 0.02L / Min and In the anion solution stirred at 200rpm, keep stirring until a transparent gel is formed. Filter, dry at 180°C for 2h, and bake the dried sample at 1050°C for 3h in a mixed atmosphere of 95% nitrogen / 5% hydrogen. The average particle size of the phosphor is 50nm, and the color rendering index Ra is 86.

Embodiment 2

[0022] Weigh KNO 3 , Sr(NO 3 ) 2 , Ce(NO 3 ) 3 ·6H 2 O, Tb(NO 3 ) 3 ·6H 2 O, Sm(NO 3 ) 3 ·6H 2 O each 1.011g, 1.8624g, 0.0868g, 0.1812g, 0.1778g, was completely dissolved in deionized water to form a 0.3mol / L metal ion solution, added 3.5g citric acid and stirred evenly for later use. Weigh 1.1503g of NH 4 h 2 PO 4 , dissolve in deionized water to form a 0.2mol / L solution, then add 0.2g of polyethylene glycol 20000 to the solution to form an anion solution, stir well; add the metal ion solution to a 80°C water bath at a rate of 0.01L / Min and In the anion solution stirred at 250rpm, keep stirring until a transparent gel is formed. Filter, dry at 160°C for 3 hours, and bake the dried sample at 1000°C for 4 hours in a carbon monoxide atmosphere. The average particle size of the phosphor is 60nm, and the color rendering index Ra is 87.5.

Embodiment 3

[0024] Weigh Na 2 CO 3 , Zn(NO 3 ) 2 ·6H 2 O, Tb(NO 3 ) 3 ·6H 2 O, Eu(NO 3 ) 3 ·6H 2 O, MnCO 3 Each 1.0539g, 2.5287g, 0.1812g, 0.0089g, 0.1035g, add an appropriate amount of dilute nitric acid to completely dissolve in deionized water to form a 0.4mol / L metal ion solution, add 4.2g citric acid and stir evenly for later use. Weigh 1.1503g of NH 4 h 2 PO 4 , dissolve in deionized water to form a 0.3mol / L solution, then add 0.5g of polyethylene glycol 20000 to the solution to form an anion solution, stir evenly; add the metal ion solution to a 90°C water bath at a rate of 0.1L / Min and In the anion solution stirred at 200rpm, keep stirring until a transparent gel is formed. Filter, dry at 130°C for 5h, and bake the dried sample at 950°C for 8h in a hydrogen atmosphere. The average particle size of the phosphor is 56nm, and the color rendering index Ra is 87.

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Abstract

The invention discloses a light emitting diode (LED) fluorescent powder with single matrix white light excited by near ultraviolet and a preparation method thereof, the chemical formula of fluorescent powder is that: NM1-x-y-zPO4:xR, yG, zB, wherein N is freely selected from at least one of a group formed by Li, Na and K; M is freely selected from at least one of a group formed by Mg, Ca, Sr, Ba and Zn; R is freely selected from at least one of a group formed by Mn and Sm; G is Tb; and B is freely selected from at least one of a group formed by Ce and Eu, and x is higher than 0 but lower than 0.25, y is higher than 0 but lower than 0.25, and z is higher than 0 but lower than 0.25. The particle size of the prepared fluorescent according to the method provided by the invention is small and uniform, doping of fluorescent material activator on a molecule level is realized, three bands of red, green and blue can be emitted by excitation of near ultraviolet of 350-410nm, the color display index is high, and can be used in the white light LED excited by near ultraviolet.

Description

technical field [0001] The invention relates to a fluorescent powder and a preparation method thereof, in particular to a single-matrix white light fluorescent powder for near-ultraviolet excited white LEDs and a preparation method thereof. Background technique [0002] Light-converting white light LED has the advantages of power saving, small size, low calorific value, long life, fast response, shock resistance, recyclability, pollution-free, planar packaging, and easy development into light, thin and short products. It is the most promising LED in the 21st century. A new light source of value. [0003] At present, there are mainly three ways to realize the light-converting white light LED: ① blue light chip + yellow phosphor powder: the blue light LED chip is used as the basic light source to excite the yellow phosphor powder, and the complementary yellow light and blue light are mixed by the lens principle to obtain white light. This method has a simple structure and low...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/71C09K11/70
CPCY02B20/181Y02B20/00
Inventor 黎学明李武林黄静杨文静杨建春朱玉华
Owner CHONGQING UNIV
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