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Blue fluorescent powder for violet LED and preparation method thereof, and illumination light source prepared from blue fluorescent powder

A blue phosphor and violet technology, applied in the field of phosphor materials, can solve the problems of limiting the application of violet LED, low chemical stability, high synthesis temperature, and achieve high commercial application value, high color rendering, and lower reaction temperature. Effect

Inactive Publication Date: 2016-12-21
西安鸿宇光电技术有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commercial tricolor blue phosphor BaMgAl 10 o 17 :Eu 2 + (BAM), due to its high synthesis temperature (1600-1800°C), low chemical stability and high light attenuation under near-ultraviolet light excitation, and the absorption of BAM powder at 400nm is very weak, it cannot be well integrated with InGaN chips. (350-410nm) match, which limits the application in violet LEDs, and there is still a big gap between the luminous efficiency of ultraviolet-excited white-light LEDs and rare earth tricolor fluorescent lamps, mainly because of the lack of blue below 450nm and 500nm Caused by left and right green etc.

Method used

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  • Blue fluorescent powder for violet LED and preparation method thereof, and illumination light source prepared from blue fluorescent powder
  • Blue fluorescent powder for violet LED and preparation method thereof, and illumination light source prepared from blue fluorescent powder
  • Blue fluorescent powder for violet LED and preparation method thereof, and illumination light source prepared from blue fluorescent powder

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preparation example Construction

[0045] The present invention provides the preparation method of above-mentioned blue fluorescent powder for violet light LED, and this method comprises the following steps:

[0046] Step 1: According to the chemical structural formula M of the blue phosphor 10 (P 1-3b / 5 N b o 4 ) 6 x 2 :yEu 2+ For the stoichiometric numbers shown, the raw material MCO was weighed separately 3 , ammonium dihydrogen phosphate, MCl 2 and Eu 2 o 3 , mix these raw materials evenly with flux, and put them into a mortar and grind them thoroughly;

[0047] The second step: put the above-mentioned ground materials into an aluminum crucible, and place a certain amount of ammonium chloride around the crucible, and heat it to volatilize the ammonium chloride to form ammonium chloride in a gas phase state. The calcination synthesis is carried out under the combined action of ammonium chloride atmosphere, the calcination temperature is 1200-1400 DEG C, and the calcination time is 2-5 hours. After...

Embodiment 1

[0053] Weigh 45g ammonium dihydrogen phosphate, 2.3g europium oxide, 17g strontium chloride, 75g strontium carbonate, and weigh 0.6wt% flux BaF of the total mass of raw materials according to the chemical structural formula of the blue fluorescent powder 2 to mix with the ingredients. Mixing the weighed raw material and flux in a mortar for grinding, after grinding for 30 minutes, sieving the ground material through a 200-mesh sieve to obtain the sieved material;

[0054] Put the above-mentioned sieved material into the crucible, then weigh 10wt% ammonium chloride of the total mass of the raw material and place it around the crucible, heat the ammonium chloride to volatilize and form ammonium chloride in the gas phase state, and mix the ammonium chloride with 4% hydrogen reducing atmosphere. The calcination synthesis is carried out under the combined action of ammonium chloride atmosphere, the calcination temperature is 1200°C, and the calcination time is 3h. Then cool down, ...

Embodiment 2

[0060] Weigh 45g ammonium dihydrogen phosphate, 2.3g europium oxide, 17g strontium chloride, 75g strontium carbonate, and weigh 0.6wt% flux BaF of the total mass of raw materials according to the chemical structural formula of the blue fluorescent powder 2 to mix with the ingredients. Mixing the weighed raw material and flux in a mortar for grinding, after grinding for 30 minutes, sieving the ground material through a 200-mesh sieve to obtain the sieved material;

[0061] Put the above-mentioned sun-dried materials into a crucible, and perform calcination under a 4% hydrogen reducing atmosphere, the calcination temperature is 1200°C, and the calcination time is 3h. Then after cooling, pulverizing, sieving, washing with water, washing with alcohol, sieving, and drying, the required Sr 9.8 (P 0.76 N 0.4 o 4 ) 6 Cl 2 :0.2Eu 2+ Phosphor.

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Abstract

The invention relates to a blue fluorescent powder for a violet LED and a preparation method thereof, and an illumination light source prepared from the blue fluorescent powder. The blue fluorescent powder has a chemical structural formula of M[10-y](P[1-3b / 5]N[b]O[4])[6]X[2]:yEu<2+>, wherein M is selected from one or two of Ca, Sr, Ba and Mg, X is one or two of F and Cl, y represents the molar coefficient, 0<y<1, b represents the atom number of N replacing P, and 0<b<5 / 3. The fluorescent powder prepared by adopting a reduction hydrogen atmosphere and an ammonium chloride atmosphere has strong absorption at 250 nm-420 nm, has the emission spectrum in the range of 430 nm-550 nm, and has the characteristics of good crystallinity, and high luminous intensity. A luminescent material is matched with ultraviolet or near ultraviolet LED and other luminous materials such as a green fluorescent powder and a red fluorescent powder to prepare a high-color-developing white LED light source.

Description

technical field [0001] The invention relates to a blue fluorescent powder for ultraviolet or near-ultraviolet LEDs, and provides a preparation method of the fluorescent material, which belongs to the field of fluorescent powder materials. Background technique [0002] At present, the main method of realizing white LED is to excite YAG yellow phosphor powder with blue LED chip. This method has the advantages of simple process and low cost, but the white LED produced by it has unbalanced emission wavelength and high peak intensity of blue light. The problem that can easily cause sleep disturbance is the "blue light problem". On the other hand, white LEDs composed of blue LEDs and phosphors do not contain violet light, so there will be differences in color compared with sunlight. Although red phosphors can be added to improve its color rendering index, the color rendering index is very low. It is difficult to achieve more than 95. [0003] The method of preparing white light ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/73H01L33/50
CPCC09K11/7739C09K11/0883H01L33/502H01L2933/0041
Inventor 张琳阮鑫栋贾晓卿吴振雄张辽解荣军
Owner 西安鸿宇光电技术有限公司
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