Manganese ion activated green long afterglow luminescent material and its preparation method
A long afterglow luminescence, green technology, applied in luminescent materials, chemical instruments and methods, etc., can solve the problems of slow progress and little research.
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Embodiment 1
[0015] Spectroscopically pure magnesium oxide (MgO) 8.0609g was weighed, and analytically pure tin dioxide (SnO 2 ) 15.0709g, manganese oxalate (Mn(CH 3 COO) 2 ·4H 2 0) 0.049g, after fully ground by wet method in an agate mortar, put it into a corundum crucible, compact it, cover the crucible mouth tightly with a flat crucible cover, and then put it into a larger alumina crucible , and put an appropriate amount of activated carbon around the corundum crucible, then cover the mouth of the large crucible with corundum slices, place it in a high-temperature furnace, heat it to 950 ° C, and keep it at a constant temperature for 3 hours. It was released from the oven at high temperature and cooled to room temperature to obtain a nearly white powder. The product was identified by XRD as magnesium stannate (Mg 2 SnO 4 ), the emission spectrum includes a narrow band from 460 to 560 nm. After being irradiated by 254nm ultraviolet light for 1 minute, the luminescent material exhib...
Embodiment 2
[0017] Spectroscopically pure magnesium oxide (MgO) 8.0609g was weighed, and analytically pure tin dioxide (SnO 2 ) 15.0709g, manganese oxalate (Mn(CH 3 COO) 2 ·4H 2 O) 0.049g, after the wet method is fully ground in the agate mortar, it is put into a corundum crucible, compacted, and the crucible mouth is tightly covered with a flat crucible cover, placed in a high-temperature furnace, heated to 950 ℃, constant temperature for 1 hour . It was released at high temperature and cooled to room temperature to obtain a pale pink powder. The product turned pale pink because the samples synthesized in the air contained Mn. 4+ caused. The product was identified by XRD as magnesium stannate (Mg 2 SnO 4 ) and a small amount of unreacted tin dioxide (SnO 2 ), the emission spectrum includes a narrow band from 460 to 560 nm. After being irradiated by 254nm ultraviolet light for 1 minute, the luminescent material exhibits green long afterglow emission, and the afterglow time is abou...
Embodiment 3
[0019] Spectroscopically pure magnesium oxide (MgO) 8.0609g was weighed, and analytically pure tin dioxide (SnO 2 ) 15.0709g, manganese oxalate (Mn(CH 3 COO) 2 ·4H 2 O) 0.049g, after the wet method is fully ground in the agate mortar, put into the corundum crucible, compact, cover the crucible mouth tightly with a flat crucible cover, place it in a high-temperature furnace, feed high-purity hydrogen, and heat to 950℃, constant temperature for 2 hours. High temperature out of the oven, cooled to room temperature to get gray powder. The product was identified by XRD as magnesium stannate (Mg 2 SnO 4 ) and magnesium oxide (MgO), in addition to producing a small amount of grey metallic tin. The emission spectrum includes a narrow band from 460 to 560 nm. After being irradiated by 254 nm ultraviolet light for 1 minute, the luminescent material exhibits green afterglow emission, and the afterglow time is about 0.5 hours.
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