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A long afterglow luminescent material with controllable afterglow time and its preparation method

A technology of long afterglow luminescence and afterglow time, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems that it is difficult to enter the matrix lattice, affect the performance of luminescence and afterglow, and it is difficult to adjust the wavelength, etc., so that the afterglow time can be adjusted , control the afterglow time, the effect of high luminous brightness

Active Publication Date: 2018-12-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] CN102585825A and CN1594498A provide Dy 3+ Eu 2+ or Eu 2+ Tb 3+ Bi 3+ co-doped Y 3 Ga 5 o 12 Phosphor powder, but because Eu in this material is divalent, it does not match the trivalent Y charge, it is difficult to enter the matrix lattice, which affects the luminescence and afterglow performance
In addition, neither of the above two patents uses Ce as the luminescent ion
CN102074644A, CN104300077A and CN102468413A provide more than twenty kinds of long-lasting luminescent materials that can be used as AC LED phosphors. However, the emission wavelength of these materials is often relatively fixed, and it is difficult to adjust the wavelength according to the actual LED packaging requirements; in addition , the above patents use Tb 3+ as Y 3 (Al,Ga) 5 o 12 of luminescent ions

Method used

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  • A long afterglow luminescent material with controllable afterglow time and its preparation method
  • A long afterglow luminescent material with controllable afterglow time and its preparation method
  • A long afterglow luminescent material with controllable afterglow time and its preparation method

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Experimental program
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Effect test

Embodiment 1

[0025] Weigh 64.447g of yttrium oxide, 2.005g of cerium oxide and 32.333g of aluminum oxide as raw materials, and 3g of aluminum fluoride as flux. Mix the above materials evenly, and place them in a reducing atmosphere for calcination at a temperature of 1600°C for 4 hours. The fired sample was ground and pulverized, and the emission spectrum, excitation spectrum and afterglow decay curve were measured.

Embodiment 2

[0027] Weigh 76.443g of lutetium oxide, 1.349g of cerium oxide and 22.207g of aluminum oxide as raw materials, and 3g of aluminum fluoride as flux. Mix the above materials evenly, and place them in a reducing atmosphere for calcination at a temperature of 1600°C for 4 hours. The fired sample was ground and pulverized, and the emission spectrum, excitation spectrum and afterglow decay curve were measured.

Embodiment 3

[0029] Weigh 27.090g of yttrium oxide, 43.488g of gadolinium oxide, 1.686g of cerium oxide and 27.737g of aluminum oxide as raw materials, and 3g of aluminum fluoride as flux. Mix the above materials evenly, and place them in a reducing atmosphere for calcination at a temperature of 1600°C for 4 hours. The fired sample was ground and pulverized, and the emission spectrum, excitation spectrum and afterglow decay curve were measured.

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Abstract

The invention relates to a persistence-controllable long-persistence light-emitting material and a preparation method thereof, and belongs to the field of light-emitting materials. The light-emitting material can be particularly applied to alternating current LED (Light-Emitting Diode) illuminating devices. Controllable adjustment of a light-emitting wavelength and persistence can be realized by changing material components, and different packaging requirements on the alternating current LED illuminating device can be met. The novel long-persistence material can be effectively excited by ultraviolet light and visible light, and the excitation wavelength range is 250nm to 500nm; green light, green-yellow light and yellow light can be emitted by regulating and controlling the components, and the emission wavelength range is 520nm to 600nm; persistence from microsecond (mum<s>) to hours (h) can be obtained by modulating an energy band.

Description

technical field [0001] The invention belongs to the field of luminescent materials, and relates to a long afterglow luminescent material with controllable afterglow time and a preparation method thereof, in particular to a garnet-based yellow / green phosphor with controllable afterglow time and capable of being effectively excited by visible light. The luminescent material is especially applicable to AC LED lighting devices. Background technique [0002] Long-lasting luminescent materials have the function of "storing" light. Under the illumination of the excitation light source, the long-lasting luminescent material can store light energy inside the material; when the excitation light is removed, the material releases the light energy and continues to emit light. Long afterglow materials are widely used in handicrafts, night indication and other fields. At present, long afterglow phosphors have important use value in AC LED lighting devices. LED (Light Emitting Diodes, Li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/80C09K11/86
CPCC09K11/7774C09K11/7776C09K11/7792
Inventor 刘泉林宋振王志珍张荣建夏志国
Owner UNIV OF SCI & TECH BEIJING
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