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Bivalent bismuth ion-doped barium sulfate red fluorescent material and preparation method thereof

A bivalent bismuth ion, red fluorescence technology, applied in the field of red fluorescent materials, can solve the problems such as the inability to reduce the price of phosphors, harsh preparation conditions, etc., and achieve the effects of easy control of reaction conditions, simple preparation operation and good temperature resistance performance.

Inactive Publication Date: 2013-03-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the preparation conditions of nitrides and nitrogen oxides are usually harsh, requiring high temperature (>1700°C), high pressure (>5 atmospheres) and special conditions. These conditions have high requirements for equipment, which affects the price of phosphors. reduce

Method used

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  • Bivalent bismuth ion-doped barium sulfate red fluorescent material and preparation method thereof
  • Bivalent bismuth ion-doped barium sulfate red fluorescent material and preparation method thereof
  • Bivalent bismuth ion-doped barium sulfate red fluorescent material and preparation method thereof

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Effect test

Embodiment 1

[0033] Select barium carbonate, ammonium sulfate and bismuth trioxide as starting materials, according to Ba:S:Bi=(1-x):1:x(x=0.0003, 0.0005, 0.001, 0.002, 0.004, 0.006, 0.008, 0.01 , 0.012) molar ratio, weigh the three raw materials respectively, and control the total weight of the mixture to be about 50 grams. After 50 grams of the mixture were mixed by ball milling, they were put into a corundum crucible, and then the crucible was put into a high-temperature electric furnace. Precisely control the heating rate, control the decomposition reaction rate of the ammonium sulfate compound, prevent the mixture from overflowing from the crucible, and pre-fire the sample at 400°C for 5 hours in an air atmosphere. The pre-fired sample was taken out, ground and mixed again, put into a crucible, and fired at 1000° C. for 4 hours in an air atmosphere to obtain a bivalent bismuth-doped barium sulfate red fluorescent material. X-ray diffraction analysis showed that it was BaSO4 pure phas...

Embodiment 2

[0035]Select barium nitrate, ammonium bisulfate and bismuth nitrate as starting materials, weigh the three materials according to Ba:S:Bi=(1-0.006):1:0.006, and control the total weight of the mixture to about 50 grams. After 50 grams of the mixture were mixed by ball milling, they were put into a corundum crucible, and then the crucible was put into a high-temperature electric furnace. Precisely control the heating rate, control the decomposition reaction rate of the ammonium sulfate compound, prevent the mixture from overflowing from the crucible, and pre-fire the sample at 300°C for 5 hours in an air atmosphere. The pre-fired sample was taken out, ground and mixed again, put into a crucible, and fired at 900° C. for 3 hours in an air atmosphere to obtain a bivalent bismuth-doped barium sulfate red fluorescent material. X-ray diffraction analysis showed that it was BaSO4 pure phase. The spectral properties of the fluorescent powder and its thermal quenching resistance are s...

Embodiment 3

[0037] Select barium chloride, ammonium bisulfate and bismuth chloride as starting materials, weigh the three materials according to Ba:S:Bi=(1-0.006):1:0.006, and control the total weight of the mixture to about 50 grams. After 50 grams of the mixture were mixed by ball milling, they were put into a corundum crucible, and then the crucible was put into a high-temperature electric furnace. Precisely control the heating rate, control the decomposition reaction rate of the ammonium sulfate compound, prevent the mixture from overflowing from the crucible, and pre-fire the sample at 500°C for 3 hours in an air atmosphere. The pre-fired sample was taken out, ground and mixed again, put into a crucible, and fired at 1100° C. for 4 hours in an air atmosphere to obtain a bivalent bismuth-doped barium sulfate red fluorescent material. X-ray diffraction analysis showed that it was BaSO4 pure phase. The spectral properties of the fluorescent powder and its thermal quenching resistance a...

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Abstract

The invention discloses a bivalent bismuth ion-doped barium sulfate red fluorescent material belonging to an orthorhombic system, wherein the molar ratio of the elements: Ba:S:Bi=(1-x):1:x, and 0.0005<=x<=0.012. The invention also discloses a preparation method of the bivalent bismuth ion-doped barium sulfate red fluorescent material, which comprises the following steps of: (1) weighing raw materials; (2) uniformly grinding the weighed raw materials, and pre-calcining at 300-500 DEG C for 3-5 hours; and (3) taking out the pre-calcined sample, uniformly grinding again, and calcining at 900-1,100 DEG C for 3-5 hours. Through the invention, the prepared fluorescent powder is absorbed in the spectral regions of ultraviolet and blue light, and red fluorescent light covering a range of 580-720nm is excited by ultraviolet and blue light; and the fluorescent light has a life of about 10 microseconds as well as good resistance against thermal quenching.

Description

technical field [0001] The invention relates to the field of red fluorescent materials, in particular to a divalent bismuth ion-doped barium sulfate red fluorescent material and a preparation method thereof. Background technique [0002] With the development of human society, energy shortage and ecological environment pollution are increasingly threatening the survival of human beings and become problems that human beings must solve. At present, vigorously promote and apply low energy consumption (about 10-15% of the current lighting source), high luminous efficiency (about 8-10 times of the current lighting source), long service life (about 10 times of the current lighting source), and no Solid-state LED lighting technology with properties such as mercury is one of the solutions. Solid-state LED lighting can be widely used in automobiles, transportation, military and people's daily life. [0003] At present, the commercial dichroic white LED mainly adopts the blue light I...

Claims

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Application Information

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IPC IPC(8): C09K11/56
Inventor 曹人平彭明营邱建荣
Owner SOUTH CHINA UNIV OF TECH
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