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Nitrogen oxide orange fluorescent powder and preparation method thereof

A nitrogen oxide, orange-red technology, applied in the field of phosphors, can solve the problems of difficult to make color rendering index, single luminescence, etc., and achieve the effects of good chemical stability, wide process window, and cheap and easy-to-obtain raw materials.

Inactive Publication Date: 2013-10-02
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the single luminescence of this powder, it is difficult to make LEDs with excellent color rendering index when superimposed with blue light

Method used

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  • Nitrogen oxide orange fluorescent powder and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) According to Sr 0.81 Ba 0.1 Li 0.02 Ce 0.02 Si 2 o 2 N 2 :0.05Yb 2+ (x=0.05, y=0.1, z=0.02 in the general chemical formula) Weigh SrCO 3 、BaCO 3 , SiO 2 , Li 2 CO 3 , CeO 2 、Si 3 N 4 and Yb 2 o 3 and placed in a mortar and mixed evenly by means of grinding to obtain a mixture,

[0025] 2) Add NaF accounting for 5% of the total mass of the mixture to the mixture, mix well, and then put it into a graphite crucible, place the graphite crucible in a carbon tube vacuum furnace, 2 and H 2 under the mixed atmosphere (N 2 with H 2 The volume ratio is 3:1) at a rate of 20°C / min to 1700°C and keep it warm for 12 hours, then naturally cool to room temperature to obtain a sintered product; take out the sintered product, grind and sieve to obtain a median particle size D50=11 Micron powder, then washed with deionized water, and then dried at 50°C to obtain the chemical formula Sr 0.81 Ba 0.1 Li 0.02 Ce 0.02 Si 2 o 2 N 2 :0.05Yb 2+ Nitride-orange phosph...

Embodiment 2

[0028] 1) According to Sr 0.76 Ba 0.2 Li 0.01 Ce 0.01 Si 2 o 2 N 2 :0.02Yb 2+ (x=0.02, y=0.2, z=0.01 in the general chemical formula) Weigh SrCO 3 、BaCO 3 , SiO 2 , Li 2 CO 3 , CeO 2 、Si 3 N 4 and Yb 2 o 3 and placed in a mortar and mixed evenly by means of grinding to obtain a mixture,

[0029] 2) Add 3% SrF to the mixture, accounting for the total mass of the mixture 2 , fully mixed evenly, and then put into a graphite crucible, place the graphite crucible in a carbon tube vacuum furnace, under N 2 and H 2 under the mixed atmosphere (N 2 with H 2 The volume ratio is 95:1) at a rate of 10°C / min to 1650°C and keep it warm for 24 hours, then naturally cool to room temperature to obtain a sintered product; take out the sintered product, grind and sieve to obtain a median particle size D50=12 Micron powder, then washed with deionized water, and then dried at 100 ° C to obtain the chemical formula Sr 0.76 Ba 0.2 Li 0.01 Ce 0.01 Si 2 o 2 N 2 :0.02Yb 2+ ...

Embodiment 3

[0031] 1) According to Sr 0.72 Ba 0.15 Li 0.015 Ce 0.015 Si2 o 2 N 2 :0.1Yb 2+ (x=0.1, y=0.15, z=0.015 in the general chemical formula) Weigh SrO, BaCO 3 , SiO 2 , Li 2 CO 3 , CeO 2 、Si 3 N 4 and Yb 2 o 3 and placed in a mortar and mixed evenly by means of grinding to obtain a mixture,

[0032] 2) Add 1% BaF to the mixture, accounting for the total mass of the mixture 2 , fully mixed evenly, and then put into a graphite crucible, place the graphite crucible in a carbon tube vacuum furnace, under N 2 and H 2 under the mixed atmosphere (N 2 with H 2 The volume ratio is 9:1) at a rate of 15°C / min to 1500°C and keep it warm for 16 hours, then naturally cool to room temperature to obtain a sintered product; take out the sintered product, grind and sieve to obtain a median particle size D50=8 Micron powder, then washed with deionized water, and then dried at 60 ° C to obtain the chemical formula Sr 0.72 Ba 0.15 Li 0.015 Ce 0.015 Si 2 o 2 N 2 :0.1Yb 2+ Nitr...

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Abstract

The invention provides nitrogen oxide orange fluorescent powder and a preparation method thereof. The chemical general formula of the nitrogen oxide orange fluorescent powder is Sr1-x-y-2zBayLizCezSi2O2N2:xYb<2+>, wherein 0.02<=x<=0.1, 0.1<=y<=0.2, and 0.005<=z<=0.02. The preparation method comprises the following steps: evenly mixing a Sr-containing compound, a Ba-containing compound, SiO2, Li2CO3, CeO2, Si3N4 and Yb2O3 according to the stoichiometric proportion of the fluorescent powder, and adding a catalyst; sintering the raw materials through a high-temperature solid-phase method, and cooling to room temperature; and washing the sintered product, and drying to obtain the fluorescent powder. The fluorescent powder has favorable chemical stability and heat stability and has favorable luminescence property, and the emission peak value exists at 590 nm approximately, thus ensuring that the fluorescent powder is potential near ultraviolet fluorescence excitation powder for novel white-light LEDs (light-emitting diode). The preparation method is simple and easy to implement, convenient to operate and suitable for industrial production.

Description

technical field [0001] The invention relates to a fluorescent powder, in particular to a nitrogen oxide orange-red fluorescent powder and a preparation method thereof. Background technique [0002] At present, the preparation method of white light LEDs for lighting mainly uses blue light chips to excite yellow phosphor powder. Due to the single luminescence of the powder, it is difficult to make an LED with an excellent color rendering index when superimposed with blue light. One of the more recent studies uses near-ultraviolet chips to excite three primary colors or multi-color phosphors to obtain white LEDs for lighting with high color rendering index. [0003] Most of the nitrogen oxides discovered recently are near-ultraviolet excited powders, and nitrogen oxides have attracted more attention because of their stronger chemical stability than silicate and aluminate powders. Contents of the invention [0004] The object of the present invention is to provide a nitrogen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/79
Inventor 苏醒宇
Owner IRICO