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.

Inactive Publication Date: 2006-11-22
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are relatively few studies on other color long-lasting luminescent materials, and the progress is relatively slow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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PUM

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Abstract

The invention discloses a inverse spinel structure magnesium stannate green long persistence phosphor to prepare Mg2SnO4 as substrate and Mn2+ as activating ion activate by bivalent manganese ion, which comprises the following steps: adopting MgO and SnO2 as substrate; blending Mn2+ ion; adding Mn(CH3COO)2 .4H2O; setting the quantity of doping agent at 0.005-1 percent mole; weighing MgO and SnO2 according to 2:1 molar proportion; putting 0.005-1 percent mole activator in the pot; setting igniting temperature at 950-1250 deg.c for 1-3 h; setting active carbon as reducer; fetching the reactor out of furnace; cooling in the air to produce almost white product; luminating the product through 254 nm ultraviolet lamp to see green long persistence phosphor; displaying the best effect when the doping quantity of Mn2+ is at 0.2-0.3 percent and color coordination of x is 0.0875 and y is 0.6083.

Description

technical field [0001] The invention relates to a long afterglow luminescent material magnesium stannate and a preparation method thereof, in particular to a divalent transition metal ion Mn 2+ Activated high-brightness green-emitting long-persistence luminescent material and preparation method. Background technique [0002] Long afterglow luminescence belongs to electron capture materials, which has no absolute boundary with photo-excited luminescent materials and thermoluminescence materials. Long afterglow luminescence materials are, in a sense, a special kind of thermoluminescence Thermoluminescent material. According to the general principle of long afterglow luminescence, long afterglow luminescence can be observed as long as a certain concentration and depth of defects or traps are created in the matrix that can release stored energy through thermal disturbance at room temperature. However, the development of long afterglow luminescent materials is quite slow. It to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/66
Inventor 李斌雷炳富岳淑美刘春波司振军李文连
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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