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Preparation method for green light-excited long afterglow phosphor with warm color

A long afterglow and red luminescence technology, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of low brightness, poor chemical stability, and short afterglow time of luminescent materials, and achieve adjustable luminous chromaticity, uniform composition, The effect of eliminating distractions

Inactive Publication Date: 2014-03-05
HANGZHOU DIANZI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, red luminescent materials, one of the three primary colors, cannot compete with materials such as green light and blue light in terms of luminous brightness and afterglow time, and are still in the research stage in the field of long-lasting luminescent materials.
[0005] Red luminescent materials such as alkaline earth metal sulfides activated by rare earth ions are the first generation of red long-lasting luminescent materials, but the system has poor chemical stability, and the deliquescent release of H 2 S is an environmentally harmful substance, and the afterglow time is short, so it is still insufficient in practical aspects; alkaline earth metal titanate, such luminescent materials have low brightness, and the afterglow time cannot meet the application requirements; red luminescent materials based on silicate Good chemical and thermal stability, and the raw materials are cheap and easy to get, and the application performance in luminescent ceramics is also very good, but the afterglow time is relatively short; the sulfur oxide system activated by rare earth ions has high brightness, heat resistance and radiation resistance Although the afterglow time has increased compared with other types of luminescent materials, it is far from meeting the practical requirements; the development of green and blue luminescent materials of the aluminate system is the most successful, but the red long afterglow materials research is slow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Mix BaO:ZnO:S with a material ratio of 2:1:3, doped with a certain amount of MnCO 3 (the amount of the substance is 0.01 of the amount of the ZnO substance) and then mixed evenly.

[0020] (2) Add SrAl 2 o 4 :Eu 2+ , Dy 3+ Green long-lasting luminescent powder, control the total mass ratio of (1):(2) dry powder to 10:1, mix well, put it into a high-temperature program-controlled atmosphere heat treatment furnace for pre-sintering, control the sintering temperature at 950°C, and hold the time for 0.5h~1h.

[0021] (3) Put the sintered sample into the vacuum system and evacuate to make the pressure of the vacuum chamber lower than 1×10 -1 Pa.

[0022] (4) Turn on the electron gun, adjust the energy of the electron beam between 1KeV and 10KeV, and the current density of the electron beam at 10mA cm -2 ~100mA·cm -2 between adjustments.

[0023] (5) The electron beam is scanned on the sample until a red light visible to the naked eye is emitted, and a warm color...

Embodiment 2

[0025] (1) Mix BaO:ZnO:S with a material ratio of 2:1:3, doped with a certain amount of MnCO 3 (the amount of the substance is 0.05 of the amount of the ZnO substance) and then mixed evenly.

[0026] (2) Add SrAl 2 o 4 :Eu 2+ , Dy 3+ Green long-lasting luminous powder, control the total mass ratio of (1):(2) dry powder to 15:1, mix well, put it into a high-temperature program-controlled atmosphere heat treatment furnace for pre-sintering, control the sintering temperature at 950°C, and hold the time for 0.5h~1h.

[0027] (3) Put the sintered sample into the vacuum system and evacuate to make the pressure of the vacuum chamber lower than 1×10 -1 Pa.

[0028] (4) Turn on the electron gun, adjust the energy of the electron beam between 1KeV and 10KeV, and the current density of the electron beam at 10mA cm -2 ~100mA·cm -2 between adjustments.

[0029] (5) The electron beam is scanned on the sample until a red light visible to the naked eye is emitted, and a warm color lo...

Embodiment 3

[0031] (1) Mix BaO:ZnO:S with a material ratio of 2:1:3, doped with a certain amount of MnCO 3 (the amount of the substance is 0.1 of the amount of the ZnO substance) and then mixed evenly.

[0032] (2) Add SrAl 2 o 4 :Eu 2+ , Dy 3+ Green long-lasting luminescent powder, control the total mass ratio of (1):(2) dry powder to 20:1, mix well, put it into a high-temperature program-controlled atmosphere heat treatment furnace for pre-sintering, control the sintering temperature at 950°C, and hold the time for 0.5h~1h.

[0033] (3) Put the sintered sample into the vacuum system and evacuate to make the pressure of the vacuum chamber lower than 1×10 -1 Pa.

[0034] (4) Turn on the electron gun, adjust the energy of the electron beam between 1KeV and 10KeV, and the current density of the electron beam at 10mA cm -2 ~100mA·cm -2 between adjustments.

[0035] (5) The electron beam is scanned on the sample until a red light visible to the naked eye is emitted, and a warm color ...

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Abstract

The invention relates to a preparation method for green light-excited long afterglow phosphor with warm color. All the conventional red phosphors are low in luminous intensity or short in afterglow time, or cause environment pollution, so that the practical requirements cannot be met. Through the adoption of the invention, red phosphor Ba2Zn1-xS3 : xMn2+ excited by green light is coated on the surface of green long afterglow phosphor SrAl2O4 : Eu2+, Dy3+; and the thickness of the red phosphor can be controlled, so as to realize the purpose of efficient warm color long afterglow radiating with green-olivine-yellow-orange-red lights. The preparation method solves the problem that the afterglow time of the conventional directly prepared red phosphors is short, thereby being a new way for preparing warm color long afterglow materials.

Description

technical field [0001] The invention relates to a luminescent material, in particular to a long afterglow luminescent material, which is a method for preparing a warm color long afterglow luminescent material excited by green light. Background technique [0002] Long afterglow luminescent material is a kind of important light-light conversion material and energy storage and energy-saving material. It can store light energy when there is light irradiation, and release it slowly when there is no light irradiation. It is a pollution-free cold light source. . [0003] Traditional long afterglow materials are mainly alkaline earth metals and transition element sulfides, such as CsS:Bi and ZnS:Cu. Such materials have poor chemical stability, short afterglow time, and most require the addition of radioactive isotopes. At present, sulfides, aluminates, silicates, titanates and other materials activated by rare earth ions have become the main body of new long afterglow materials. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/64
Inventor 张尔攀孔哲席俊华季振国
Owner HANGZHOU DIANZI UNIV