Cr < 3 + >-doped broadband near-infrared fluorescent powder with high luminous efficiency and preparation method thereof
A phosphor, near-infrared technology, applied in chemical instruments and methods, luminescent materials, etc., can solve problems such as restricting production and application, and achieve the effects of simple preparation method and production process, raw material acquisition, and low price
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Embodiment 1
[0030] a Cr 3+ Doped broadband near-infrared phosphor, the material is solid powder, the molecular formula is Mg 0.998 Zn 0.001 Li 0.002 O: 0.01Cr 3+. The preparation method is as follows:
[0031] (1) Weigh MgO: 41.0402g, ZnO: 0.0831g, Li 2 CO 3 : 0.0754g, Cr 2 o 3 : 0.7603g. Pour the above-mentioned raw materials together with an appropriate amount of absolute ethanol into a ball milling tank for ball milling, the ball milling speed is 300r / min, and the ball milling time is 5h, to obtain a uniformly mixed mixture and dry it;
[0032] (2) Put the mixture obtained above into a corundum crucible and put it into a resistance furnace, raise the temperature to 850°C at a heating rate of 4°C / min in a reducing atmosphere, and pre-fire for 3h;
[0033] (3) Cool down to room temperature at a cooling rate of 8°C / min, ball mill the mixture obtained in step (2) again under the conditions of step (1), then raise the temperature to 1550°C at a heating rate of 5°C / min, and calcine...
Embodiment 2
[0036] a Cr 3+ Doped broadband near-infrared phosphor, the material is solid powder, the molecular formula is Mg 0.896 Zn 0.1 Li 0.008 O: 0.01Cr 3+ ,0.003Yb 3+ . The preparation method is as follows:
[0037] (1) Weigh MgO: 36.8457g, ZnO: 8.3071g, Li 2 CO 3 : 0.3016g, Cr 2 o 3 : 1.5207g, Yb 2 (CO 3 ) 3 : 1.3477g. Pour the above-mentioned raw materials together with an appropriate amount of absolute ethanol into a ball milling tank for ball milling, the ball milling speed is 250r / min, and the ball milling time is 6h, to obtain a uniformly mixed mixture and dry it;
[0038] (2) Put the mixture obtained above into a corundum crucible and put it into a resistance furnace, raise the temperature to 950°C at a heating rate of 5°C / min in a reducing atmosphere, and pre-fire for 5h;
[0039] (3) Cool down to room temperature at a cooling rate of 8°C / min, ball mill the mixture obtained in step (2) again under the conditions of step (1), then raise the temperature to 1500°C ...
Embodiment 3
[0042] a Cr 3+ Doped broadband near-infrared phosphor, the material is solid powder, the molecular formula is Mg 0.582 Ni 0.008 co 0.4 Li 0.02 O: 0.05Cr 3+ ,0.02Nd 3+ . The preparation method is as follows:
[0043] (1) Weigh MgO: 23.9333g, NiO: 0.6099g, CoO: 30.5837g, Li 2 CO 3 : 0.7540g, Cr 2 o 3 : 3.8017g, Nd 2 o 3 : 3.3664g. Pour the above raw materials together with an appropriate amount of absolute ethanol into a ball milling tank for ball milling at a ball milling speed of 280r / min and a ball milling time of 8 hours to obtain a uniformly mixed mixture and dry it;
[0044] (2) Put the mixture obtained above into a corundum crucible and put it into a resistance furnace, heat up to 1000°C at a heating rate of 2°C / min in an air atmosphere, and pre-fire for 2 hours;
[0045] (3) Cool down to room temperature at a cooling rate of 5°C / min, and pour the mixture obtained in step (2) into a ball mill jar together with an appropriate amount of absolute ethanol again ...
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