White long-afterglow luminescent material and preparation method thereof

A long afterglow luminous, white technology, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems of easy formation of other substrates, serious material agglomeration, and various impurities, etc., and achieve excellent afterglow performance stability and uniform size distribution , the effect of high product purity

Active Publication Date: 2020-11-10
CHONGQING UNIV OF ARTS & SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few reports on Pr3+ ionic white LPL phosphors, because proper crystal field conditions are needed to control the blue-green and red control ratios, so that white can be achieved on a single substrate Materials with long afterglow properties, but in the actual preparation process, the lattice field conditions are difficult to control, other substrates are easy to be generated during the preparation process, and the reaction is likely to be incomplete during doping, and various other impurities will appear, and Pr3+ to be doped into the matrix. The prepared materials are seriously agglomerated and have a large size span, which affects the impure color of the afterglow emitted by it. Strong attenuation, short afterglow

Method used

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  • White long-afterglow luminescent material and preparation method thereof
  • White long-afterglow luminescent material and preparation method thereof
  • White long-afterglow luminescent material and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0034] A white long-lasting luminescent material Ca 4.93 Ga 6 o 14 :Pr 0.07 3+ The preparation method is carried out as follows:

[0035] (1) Preparation of raw material powder

[0036] According to 0.5915gCaCO 3 , 0.6673gGa 2 o 3 and 0.0141g Pr 6 o 11 Mix as raw material, add absolute ethanol, the mass ratio of absolute ethanol to the total mass of raw materials is 1:1, grind at a temperature lower than 15°C, the grinding speed is 30 rpm, and the grinding time is 50 min. After grinding, put the powder in the Dry at 100°C for 2 hours;

[0037] (2) Composite calcination

[0038] Place the raw material powder prepared in step (1) in an air environment at 1250°C, sinter for 8 hours, cool to room temperature, and grind from inside to outside along the same direction. The grinding rate is 40 revolutions / min, and the grinding time is 25 minutes. Then in 10% by volume of H 2 and 90% by volume N 2 The composition is calcined for the second time in a reducing atmosphere a...

Embodiment 2

[0045] A white long-lasting luminescent material Ca 4.91 Ga 6 o 14 :Pr 0.09 3+ The preparation method is carried out as follows:

[0046] (1) Preparation of raw material powder

[0047] Weigh 0.5891gCaCO 3 , 0.6673gGa 2 o 3 and 0.0182g Pr 6 o 11 As a raw material, add absolute ethanol, the ratio of the mass of absolute ethanol to the total mass of raw materials is 1.1:1, grind at 10°C, the grinding rate is 30 rpm, and the grinding time is 45min. After grinding, put the powder at 100°C Dry for 2 hours;

[0048] (2) Composite calcination

[0049] The first calcination is to place the raw material powder in an air environment at 1280°C, sinter for 6 hours, and after cooling to room temperature, grind from the inside to the outside along the same direction, the grinding rate is 40 rpm, and the grinding time is 30 minutes. From 10% by volume H 2 and 90% by volume N 2 Calcined for the second time under the reducing atmosphere of the composition, the temperature is 950 ...

Embodiment 3

[0052] A white long-lasting luminescent material Ca 4.995 Ga 6 o 14 :Pr 0.005 3+ The preparation method is carried out as follows:

[0053] (1) Preparation of raw material powder

[0054] Weigh 0.5992gCaCO 3 , 0.6673gGa 2 o 3 and 0.001g Pr 6 o 11 As a raw material, add absolute ethanol, the ratio of the mass of absolute ethanol to the total mass of raw materials is 1.2:1, grind at 20°C, the grinding rate is 30 rpm, and dry the powder at 100°C for 2 hours after grinding;

[0055] (2) Composite calcination

[0056] The first calcination is to place the raw material powder in an air environment at 1210°C, sinter for 7 hours, and after cooling to room temperature, grind from the inside to the outside along the same direction, the grinding rate is 40 rpm, and the grinding time is 15 minutes. From 10% by volume H 2 and 90% by volume N 2 Calcined for the second time under the reducing atmosphere of the composition, the temperature is 900 ℃, sintered for 4h, cooled to roo...

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Abstract

A white long-afterglow luminescent material is characterized in that the molecular formula of the white long-afterglow luminescent material is Ca<5-x>Ga6O14: Pr3+x, wherein Pr3+ is an activator, Ca<5-x>Ga6O14 is a matrix, and x is greater than or equal to 0.005 and less than or equal to 0.09. The white long-afterglow luminescent material is high in purity, uniform in morphology and uniform in sizedistribution, emits white afterglow after being excited by multiple excitation sources at about 10 microns, is high in light color purity, and after being excited by ultraviolet light with the wavelength of 254 nm for 5 minutes, the white afterglow initial brightness reaches 0.766 cd / m<2>, the longest afterglow initial brightness can reach 13 hours or above, and the afterglow brightness is stillkept 10 mcd / m<2>.

Description

technical field [0001] The invention relates to the technical field of luminescent materials, in particular to a white long-lasting luminescent material and a preparation method thereof. Background technique [0002] Afterglow luminescent material is an important optical functional material. It is known to absorb and store energy when illuminated by sunlight, fluorescent or incandescent lamps, etc., and then emit visible or near-infrared light within minutes or tens of minutes after the excitation light source is removed. Typically, it relies on the release of carriers trapped in traps after excitation ceases. It can release the trapped carriers under the action of thermal energy at room temperature, resulting in long-lasting luminescence. Over the past few decades, afterglow luminescent materials have gained explosive development due to their wide range of applications, such as emergency escape signs, optical information storage, and road markings visible in the dark. Si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80
CPCC09K11/7703Y02B20/00
Inventor 陈文波严娟梁国昌冉红梅聂明航张辉夏继宏
Owner CHONGQING UNIV OF ARTS & SCI
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