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Red long-lasting phosphorescent material and preparation method thereof

A long afterglow luminescence and red technology, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems that the excitation intensity in the visible light region needs to be improved, the luminous brightness and afterglow time are not enough, and the afterglow time does not meet the application requirements, etc., to achieve long afterglow Excellent performance, improved chemical stability, and long afterglow time

Active Publication Date: 2017-08-04
HANGZHOU NABEL CERAMIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the biggest disadvantage of this system is that the luminous brightness is not enough, and the afterglow time does not meet the application requirements, and it often needs strong light such as xenon lamp or short-wavelength (such as ultraviolet) light to be well excited, so the excitation intensity in the visible light region is also low. needs improvement
Silicate system with CdSiO 3 : Sm 3+ and MgSiO 3 : Mn 2+ , Eu 2+ , Dy 3+ Red and long afterglow luminescent materials, they have good chemical stability and thermal stability, but the disadvantages are short afterglow time and low brightness, which do not meet the practical requirements
Sr in aluminate system 3 Al 2 o 6 : Eu 2+ , Dy 3+ It is a red long afterglow material, its luminous brightness and afterglow time are not enough, and its water resistance is poor
In summary, the existing red long-lasting luminescent materials have their own advantages and disadvantages, and none of them can fully meet the requirements of practical applications. Therefore, it is particularly necessary to research and develop red long-lasting luminescent materials with good matrix stability and excellent afterglow performance.

Method used

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  • Red long-lasting phosphorescent material and preparation method thereof
  • Red long-lasting phosphorescent material and preparation method thereof
  • Red long-lasting phosphorescent material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] a) Weigh calcium carbonate, tin dioxide and europium oxide at the stoichiometric molar ratio Ca:Sn:Eu=2:1:0.01, relative to the matrix CaSnO 3 The addition of boric acid is taken by weighing 20 mol%;

[0037] b) Add water to the mixture in step a), the amount of water is twice the weight of the mixture, and wet blending and grinding for 1 h;

[0038] c) Drying the homogeneously mixed raw materials in step b) at a drying temperature of 150°C and a drying time of 2 h;

[0039] d) Grinding the dried raw materials in step c) into powder, using coal powder as a reducing agent, performing a high-temperature solid-phase reaction in a weak reducing atmosphere, the calcination temperature is 1300 ° C, and the holding time is 1 h;

[0040] e) Take out the calcined sample in step d) and grind to obtain a red long-lasting luminescent material.

Embodiment 2

[0042] a) Weigh calcium carbonate, tin dioxide, europium oxide and sublimed sulfur according to the stoichiometric molar ratio Ca:Sn:Eu:S=2:1:0.004:0.01;

[0043] b) Add water to the mixture in step a), the amount of water is 3 times of the weight of the mixture, wet blending and grinding for 2 h;

[0044] c) Dry the uniformly mixed raw materials after step b) at a drying temperature of 200°C and a drying time of 1 h;

[0045] d) Grinding the dried raw materials in step c) into powder, using activated carbon as a reducing agent, and carrying out a high-temperature solid-phase reaction in a weak reducing atmosphere, the calcination temperature is 1350 ° C, and the holding time is 0.5 h;

[0046] e) Take out the calcined sample in step d) and grind to obtain a red long-lasting luminescent material.

Embodiment 3

[0048] a) Weigh calcium carbonate, tin dioxide, europium oxide, neodymium oxide and sublimed sulfur in stoichiometric molar ratio Ca:Sn:Eu:Nd:S=2:1:0.0006:0.0007:0.05, relative to the matrix CaSnO 3 The add-on is 30 mol% and takes by weighing boric acid;

[0049] b) Add ethanol to the mixture in step a), the amount of ethanol is 1 times the weight of the mixture, and wet blending and grinding for 2 h;

[0050] c) Dry the uniformly mixed raw materials after step b) at a drying temperature of 60°C and a drying time of 6 h;

[0051] d) Grind the dried raw materials in step c) into powder, use an atmosphere furnace to create a weak reducing atmosphere for high-temperature solid-phase reaction, the volume ratio of hydrogen to nitrogen is 10:90, the calcination temperature is 900 °C, and the holding time is 8 h ;

[0052] e) Take out the calcined sample in step d) and grind to obtain a red long-lasting luminescent material.

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Abstract

The invention discloses a red long-lasting phosphorescent material. The red long-lasting phosphorescent material is characterized by being a dual-matrix system. A chemical formula is CaS / CaSnO3: Eu, Ln, wherein the Ln is one element or a combination of more elements of Dy, Tb, Er, Ho, Pr, La, Sm, Ce, Nd, Y, Tm, Yb, Lu and Gd. The invention also discloses a preparation method of the red long-lasting phosphorescent material. The red long-lasting phosphorescent material prepared by the preparation method disclosed by the invention has the advantages that strong light or short-wave band (such as ultraviolet) optical excitation is not needed, and only ordinary visible light is needed for exciting; and the excited material has excellent long-lasting phosphorescent performance and the stability of matrixes is obviously improved. Compared with a sulfide matrix long-lasting phosphorescent material, the red long-lasting phosphorescent material also has the advantages that the chemical stability of sulfide can be remarkably improved, and especially the defect that the sulfide is likely to deliquesce is overcome; and compared with a stannate matrix long-lasting phosphorescent material, the red long-lasting phosphorescent material also has the advantages that the wavelength of excited light can be expanded to the visible light range, and ordinary visible light is adopted for exciting, and thus the application field of the red long-lasting phosphorescent material is expanded.

Description

technical field [0001] The invention relates to the field of long afterglow luminescent materials, in particular to a red long afterglow luminescent material and a preparation method thereof. Background technique [0002] Long Persistent Phosphors (LPPs) is a new type of energy-saving and energy-storage material that can effectively absorb excitation light (such as sunlight) and continue to emit light for a long time after the excitation stops. It has broad application prospects in emergency instructions, architectural decoration, photoelectric components, biological imaging, clinical medicine, energy and environmental engineering and other fields. The existing long-lasting luminescent materials in the visible light region are mainly divided into blue, green and red long-lasting luminescent materials, among which blue (such as Sr 2 MgSi 2 o 7 : Eu 2+ , Dy 3+ , afterglow time>25 h) and green (such as SrAl 2 o 4 : Eu 2+ , Dy 3+ , afterglow time>15 h) the aftergl...

Claims

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Application Information

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IPC IPC(8): C09K11/66
CPCC09K11/7731C09K11/774C09K11/7797
Inventor 夏昌奎余爱民余剑峰余惠谢明锋王菲菲
Owner HANGZHOU NABEL CERAMIC
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