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A kind of bismuth-doped tungsten borate yellow fluorescent powder and its preparation method and application

A technology of yellow fluorescent powder and tungstoborate, which is applied in chemical instruments and methods, luminescent materials, climate sustainability, etc., can solve the problems of reduced luminous efficiency, and achieve the effect of simple synthesis method, strong absorption, and stable structure

Active Publication Date: 2019-05-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the existing yellow phosphors are based on rare earth ions (Eu 2+ or Ce 3+ ) as an activator, such as BaAl 2 o 4 :Eu 2+ ,Sr 8 ZnSc(PO 4 ) 7 :Eu 2+ , LaSr 2 AlO 5 : Ce 3+ , in addition to the absorption in the ultraviolet region, there is also a strong absorption in the blue region, part of the luminescence of the blue phosphor is reabsorbed by the yellow phosphor, resulting in a decrease in luminous efficiency

Method used

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  • A kind of bismuth-doped tungsten borate yellow fluorescent powder and its preparation method and application
  • A kind of bismuth-doped tungsten borate yellow fluorescent powder and its preparation method and application
  • A kind of bismuth-doped tungsten borate yellow fluorescent powder and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Select dilanthanum trioxide, boric acid, tungsten trioxide, and bismuth trioxide as starting compound raw materials, and weigh four kinds of compound raw materials respectively according to the stoichiometric ratio of each element, totally 6 groups, and the proportioning ratio is as follows:

[0033] (1) La:B:W:Bi=2.985:1:1:0.015, corresponding to x=0.5%;

[0034] (2) La:B:W:Bi=2.970:1:1:0.030, corresponding to x=1.0%;

[0035] (3) La:B:W:Bi=2.955:1:1:0.045, corresponding to x=1.5%;

[0036] (4) La:B:W:Bi=2.940:1:1:0.060, corresponding to x=2.0%;

[0037] (5) La:B:W:Bi=2.925:1:1:0.075, corresponding to x=2.5%;

[0038] (6) La:B:W:Bi=2.910:1:1:0.090, corresponding to x=3.0%;

[0039] After the mixture is ground and mixed evenly, it is loaded into a corundum crucible; the corundum crucible is placed in a corundum boat and placed in a high-temperature box-type electric furnace. Strictly control the heating rate, and pre-burn at 600°C for 4h. Cool to room temperature, ...

Embodiment 2

[0046] Select dilanthanum trioxide, boric acid, tungsten trioxide, and bismuth nitrate as starting compound raw materials, according to the molar ratio of each element La:B:W:Bi=2.955:1:1:0.045, corresponding to x=1.5%; Take four compound raw materials, grind and mix the mixture evenly, put it into a corundum crucible, place the crucible in a corundum boat, and put it into a high-temperature box-type electric furnace. Strictly control the heating rate and pre-burn at 650°C for 6h. Cool to room temperature, grind and mix; then calcinate at 1100°C for 12 hours, cool to room temperature with the furnace, and grind to obtain bismuth-doped tungstoborate yellow fluorescent material. XRD pattern analysis shows that it is La 3 BWO 9 crystal phase. The spectral properties of the fluorescent powder are similar to those of Example 1.

Embodiment 3

[0048] Select dilanthanum trioxide, boric acid, tungsten trioxide, and bismuth nitrate as starting compound raw materials, according to the molar ratio of each element La:B:W:Bi=2.910:1:1:0.090, corresponding to x=3.0%; Take four compound raw materials, grind and mix the mixture evenly, put it into a corundum crucible, place the crucible in a corundum boat, and put it into a high-temperature box-type electric furnace. Strictly control the heating rate and pre-burn at 600°C for 8h. Cool to room temperature, grind and mix; then calcinate at 1150°C for 8 hours, cool to room temperature with the furnace, and grind to obtain bismuth-doped tungstoborate yellow fluorescent material. XRD pattern analysis shows that it is La 3 BWO 9 crystal phase. The spectral properties of the fluorescent powder are similar to those of Example 1.

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Abstract

The invention discloses bismuth-doped yellow tungstoborate phosphor with a chemical general formula being La3(1-x)BWO9:3xBi<3+>, wherein x represents a mole fraction and is larger than 0 and smaller than or equal to 0.1. The invention further discloses a preparation method of the bismuth-doped yellow tungstoborate phosphor. Raw materials are weighed according to the chemical general formula, ground and mixed uniformly; the mixture is precalcined at 400-800 DEG C for 4-12 h, cooled to the room temperature, ground and mixed uniformly; the mixture is calcined at 1,000-1,300 DEG C for 4-12 h, cooled with a furnace to the room temperature and ground, and the bismuth-doped yellow tungstoborate phosphor is obtained. The phosphor can be effectively excited by ultraviolet light in the range of 250-410 nm and can emit light in the range of 400-800 nm and has the light-emitting center at 560 nm, excitation and emission are adjustable, and the bismuth-doped yellow tungstoborate phosphor is used for white-light LEDs.

Description

technical field [0001] The invention relates to the field of luminescent materials, in particular to a bismuth-doped tungsten borate yellow fluorescent powder and a preparation method and application thereof. Background technique [0002] In recent years, as climate change and environmental concerns have become increasingly apparent, people are looking for alternatives to fossil fuels for energy sources that do not emit carbon dioxide. White LEDs have attracted much attention due to their superior properties such as high efficiency, compactness, durability, and environmental protection. The promotion and use of white LEDs is very important, which can significantly reduce the global electricity demand and the use of fossil fuels, and reduce the emission of greenhouse gases such as carbon dioxide. At present, white LEDs have been widely used in daily lighting, gradually replacing traditional lighting sources - incandescent lamps and fluorescent lamps. [0003] Phosphor-conve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/78H01L33/50
CPCC09K11/7712H01L33/502H01L2933/0041Y02B20/00
Inventor 彭明营韩瑾
Owner SOUTH CHINA UNIV OF TECH
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