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Manganese ion activated green long afterglow luminescent material and its preparation method

A technology of long-lasting luminescence and manganese ions, which is applied in the direction of luminescent materials, chemical instruments and methods, and can solve the problems of slow progress and little research

Inactive Publication Date: 2009-02-25
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] Take by weighing spectrally pure magnesium oxide (MgO) 8.0609g, analyze pure tin dioxide (SnO 2 ) 15.0709g, manganese oxalate (Mn(CH 3 COO) 2 4H 2 (O) 0.049g, after fully grinding in an agate mortar, put it into a corundum crucible, compact it, cover the mouth of the crucible tightly with a flat crucible lid, 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 a corundum sheet, place it in a high-temperature furnace, heat it to 950°C, and keep the temperature constant for 3 hours. Take it out of the furnace at high temperature, and cool to room temperature to obtain a near-white powder. Through XRD identification, the product is magnesium stannate (Mg 2 SnO 4 ), the emission spectrum includes a narrow band from 460 to 560 nm. After being irradiated with 254nm ultraviolet light for 1 minute, the luminescent material exhibits strong green long...

Embodiment 2

[0017] Take by weighing spectrally pure magnesium oxide (MgO) 8.0609g, analyze pure tin dioxide (SnO 2 ) 15.0709g, manganese oxalate (Mn(CH 3 COO) 2 4H 2 O) 0.049g, after fully wet grinding in an agate mortar, put it into a corundum crucible, compact it, cover the crucible mouth tightly with a flat crucible lid, place it in a high-temperature furnace, heat it to 950 ° C, and keep the temperature constant for 1 hour . Take it out of the furnace at high temperature, cool to room temperature to get a light pink powder, the product becomes light pink because the sample synthesized in the air contains Mn 4+ due to. Through XRD identification, the product is 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 with 254nm ultraviolet light for 1 minute, the luminescent material exhibits green long afterglow emission, and the afterglow time is about 1 hour....

Embodiment 3

[0019] Take by weighing spectrally pure magnesium oxide (MgO) 8.0609g, analyze pure tin dioxide (SnO 2 ) 15.0709g, manganese oxalate (Mn(CH 3 COO) 2 4H 2 (2) 0.049g, after the wet method is fully grinded in the agate mortar, put into the corundum crucible, compact, crucible mouth is tightly covered with flat crucible lid, be placed in the high-temperature furnace, feed high-purity hydrogen, be heated to 950°C, constant temperature for 2 hours. Take it out of the furnace at high temperature and cool to room temperature to get gray powder. Through XRD identification, the product is magnesium stannate (Mg 2 SnO 4 ) and magnesium oxide (MgO), in addition to a small amount of gray metallic tin. The emission spectrum includes a narrow band from 460 to 560 nm. After being irradiated with 254nm 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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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, more specifically to a divalent transition metal ion Mn 2+ Activated high brightness green emitting long afterglow luminescent material and preparation method. Background technique [0002] Long-lasting luminescence belongs to electron capture materials, and it has no absolute boundary with light-excited luminescent materials and thermoluminescent materials. Long-lasting luminescent materials are a special kind of thermoluminescent materials in a sense, that is, Thermoluminescent materials. 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 that can release stored energy through thermal disturbance at room temperature are created in the matrix. However, the development of long-lasting luminescent materials is quit...

Claims

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Application Information

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Patent Type & Authority Patents(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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