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Bismuth ion-doped germinate white light phosphor and preparation method thereof
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A technology of germanate and bismuth ions, which is applied in the field of fluorescent materials, can solve the problems of high cost and complexity of the preparation method, narrow fluorescent pink domain, etc., and achieve the effects of simple preparation method, wide luminous wavelength band and high luminous intensity
Inactive Publication Date: 2014-07-02
KUNMING UNIV OF SCI & TECH
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[0004] Aiming at the disadvantages of the existing near-ultraviolet LED lighting fluorescent pink area being narrow, requiring the compounding of multiple phosphors, and the preparation method being costly and complicated, the present invention provides a germanate white phosphor powder doped with bismuth ions and a preparation method thereof. It has high-efficiency response characteristics to near-ultraviolet light excitation, and is a single-matrix lighting phosphor with high efficiency and wide spectrum
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Embodiment 1
[0022] (1) Weigh Bi according to the chemical composition (Ge:R:Bi=1:0.99:0.01) 2 o 3 、GeO 2 、BaCO 3 , and then mix evenly; where R is any one or more of MgO, CaO, SrO, BaO, or MgCO 3 , CaCO 3 , SrCO 3 、BaCO 3 any one or more of them;
[0023] (2) Heat up the mixture obtained in step (1) to 1400°C, keep it warm for 0.5 hours, and cool down with the furnace temperature;
[0024] (3) Put the mixture calcined in step (2) at 1200°C with CO to keep it warm for 1 hour, and cool with the furnace temperature to obtain bismuth ion-doped germanate white phosphor powder GeBa 0.99 Bi 0.01 o 3 .
Embodiment 2
[0026] (1) Weigh Bi according to the chemical composition (Ge:R:Bi=1:0.9:0.1) 2 o 3 、GeO 2 、BaCO 3 , CaCO 3 , and then mix evenly; where R is any one or more of MgO, CaO, SrO, BaO, or MgCO 3 , CaCO 3 , SrCO 3 、BaCO 3 any one or more of them;
[0027] (2) Heat the mixture obtained in step (1) to 1100°C, keep it warm for 6 hours, and cool down with the furnace temperature;
[0028] (3) Place the mixture calcined in step (2) in a H 2 +N 2 Under the condition of 900 ℃ for 2 hours, and then cooled with the furnace temperature, the bismuth ion-doped germanate white phosphor GeBa can be obtained. 0.7 Ca 0.2 Bi 0.1 o 3 .
Embodiment 3
[0030] (1) Weigh Bi according to the chemical composition (Ge:R:Bi=1:0.95:0.05) 2 o 3 、GeO 2 , MgCO 3 , and then mix well;
[0031] (2) Place the mixture obtained in step (1) in H 2 +N 2 In the process, the temperature was raised to 1200°C for 4 hours, and then cooled with the furnace temperature to obtain the germanate white phosphor GeMg doped with bismuth ions. 0.95 Bi 0.05 o 3 .
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Abstract
The invention provides a bismuthion-doped germanatephosphor material and a preparation method thereof. The chemical composition formula is GeRxBi1-xO3, where x=0.01~1; R is any one of MgO, CaO, SrO, and BaO. Or several. Weigh Bi2O3, GeO2, and R according to their chemical composition (Ge: R: Bi = 1: x: 1-x), and then mix them evenly; the resulting mixture is heated to 1000~1400°C, kept warm for 0.5~6 hours, and cooled with the furnace temperature ; The calcined mixture is kept at 900-1300°C with reducing gas flowing for 1-3 hours, and then cooled with the furnace temperature to obtain bismuthion-doped germanatewhite lightphosphor. With high-efficiency response characteristics, the phosphor has good chemical stability, requires less raw materials for preparation, has a simple preparation method, and can effectively reduce costs; it matches well with near-ultraviolet LED chips, and has high visible light luminescence intensity and luminescence under near-ultravioletlight excitation. It has a wide band and good color rendering, which can reduce the need to match other facial phosphors.
Description
technical field [0001] The invention relates to a germanatewhite light phosphor doped with bismuth ions and a preparation method thereof, belonging to the technical field of fluorescent materials. Background technique [0002] As a new type of lighting source, all-solid-state white light emitting diodes (LEDs) have many advantages in energy saving, stability, and environmental protection compared with incandescent lamps and energy-saving lamps that are widely used at present. Therefore, the development of semiconductor lighting is conducive to improving the energy crisis and the environmental problems existing in the original incandescent lamps and energy-saving lamps. The realization of white light LED is based on the successful research and development of red, green and blue three primary color chips and various phosphors. At present, the common white light LEDs mainly include: using GaN-based blue light-emitting diodes with emitting yellow phosphors to produce white lig...
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