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Red divalent bismuth ion doping calcium phosphate fluorescent material and preparation method thereof

A technology of red fluorescence and bismuth ions, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., to achieve good thermal quenching resistance and shorten the fluorescence lifetime

Inactive Publication Date: 2012-01-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, most of these studies have focused on the doping of rare earth ions or transition metal ions, bivalent bismuth ions Bi 2+ There are few reports of doping

Method used

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  • Red divalent bismuth ion doping calcium phosphate fluorescent material and preparation method thereof
  • Red divalent bismuth ion doping calcium phosphate fluorescent material and preparation method thereof
  • Red divalent bismuth ion doping calcium phosphate fluorescent material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0021] Choose calcium carbonate, ammonium dihydrogen phosphate and bismuth trioxide as starting materials, press Ca 2(1-x) P 2 o 7 : 2xBi (x=0.05) shown in the molar ratio, i.e. Ca: P: Bi = 1.9: 2: 0.1, three raw materials were weighed respectively, and the total weight of the control mixture was 100 grams. 100 grams of the mixture was mixed by ball milling, put into a corundum crucible, and then put the crucible into a high-temperature electric furnace. Accurately control the heating rate, control the decomposition reaction speed of phosphorus compounds, and prevent the mixture from overflowing from the crucible. o C pre-fired for 10 hours. The pre-fired sample is taken out, ground and mixed again, put into a crucible, and heated at 1100 o C, fired twice for 10 hours, and ground again in the middle. The fired samples were placed at 1100 o CH 2 The bivalent bismuth-doped red fluorescent material was prepared after being treated for 15 minutes. X-ray diffraction analysi...

Embodiment 2

[0023] Choose calcium bicarbonate, ammonium dihydrogen phosphate and bismuth powder as starting materials, press Ca 2(1-x) P 2 o 7 : 2xBi (x=0.00001) shown in the molar ratio, that is, Ca: P: Bi = 1.99998: 2: 0.00002, three raw materials were weighed respectively, and the total weight of the control mixture was 100 grams. 100 grams of the mixture was mixed by ball milling, put into a platinum crucible, and then put the crucible into a high-temperature electric furnace. Accurately control the heating rate, control the decomposition reaction rate of phosphorus compounds, and prevent the mixture from overflowing from the crucible. o C pre-fired for 10 hours. The pre-fired sample is taken out, ground and mixed again, put into a crucible, and heated at 1200 o C, fired twice for 5 hours, and ground again in the middle. The fired samples were placed at 1200°C N 2 +H 2 The bivalent bismuth-doped red fluorescent material was prepared after being treated for 1 hour. X-ray diffra...

Embodiment 3

[0025] Choose calcium oxide, ammonium monohydrogen phosphate and bismuth subcarbonate as starting materials, press Ca 2(1-x) P 2 o 7 : 2xBi (x=0.08) shown in the molar ratio, that is, Ca: P: Bi = 1.84: 2: 0.16, three raw materials were weighed respectively, and the total weight of the control mixture was 100 grams. 100 grams of the mixture was mixed by ball milling, put into a platinum crucible, and then put the crucible into a high-temperature electric furnace. Precisely control the heating rate, control the decomposition reaction speed of phosphorus compounds, and prevent the mixture from overflowing from the crucible. o C pre-fired for 5 hours. The pre-fired sample is taken out, ground and mixed again, put into a crucible, and heated at 1100 oC, fired twice for 20 hours, and ground again in the middle. The fired sample was placed in incompletely burned graphite powder at 1100 degrees Celsius for 1 hour to prepare a bivalent bismuth-doped red fluorescent material. X-ra...

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Abstract

The invention relates to a preparation method of a red divalent bismuth ion doping calcium phosphate fluorescent material, which comprises the following steps of: taking a compound raw material containing calcium, phosphorus and bismuth, wherein the molar ratio of calcium: phosphorus: bismuth: 2 (1-x): 2: 2x, wherein X is larger than or equal to 0.00001 and is less than or equal to 0.08; grinding, uniformly mixing and then presintering, and controlling the temperature to be in the range of 900 to 1200 DEG C; after presintering, grinding again, uniformly mixing and then burning at high temperature, controlling the temperature to be in the range of 800-1000 DEG C; and finally placing a sample at the reducing atmosphere of 900-1200 DEGC for reacting for 15 minutes to 10 hours. The fluorescent material prepared by the method has the ultraviolet and blue light spectral region absorption function, has red fluorescent lights covering 600nm-750nm sections under the excitation of ultraviolet or blue lights; the fluorescence lifetime of the fluorescent material is about 10 microseconds; the fluorescence light of the fluorescent material has good heat resistance hardening characteristic; when the temperature is risen from 10k to the room temperature, the fluorescent intensity of the fluorescent material is reduced by less than 10%, and the fluorescence lifetime of the fluorescent material is shortened by less than 5%.

Description

technical field [0001] The invention relates to the field of luminescent material research, in particular to a divalent bismuth ion-doped calcium phosphate red fluorescent material and a preparation method thereof. Background technique [0002] Solid-state LED lighting technology has the advantages of low energy consumption, high luminous efficiency, long service life, mercury-free, small size, and unbreakable, so it is gradually widely used in general lighting, automobiles, transportation, imaging, agriculture, medicine and other fields. According to research from the University of California, Santa Barbara, if traditional light bulbs are replaced with 150 lumens per watt of white LEDs (WLEDs), the United States alone can save $115 billion in lighting by 2025, thus saving 133 buildings. Power station, less emission of greenhouse CO 2 258 million tons of gas. In view of this, research on LEDs, especially WLEDs, is in the ascendant recently. Among all the schemes based on ...

Claims

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Application Information

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IPC IPC(8): C09K11/74
Inventor 彭明营邱建荣董国平杨中民张勤远
Owner SOUTH CHINA UNIV OF TECH
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