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A red long afterglow luminescent material and preparation method thereof

A long afterglow luminescence, red technology, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems that do not meet the practical requirements, the excitation intensity in the visible light region needs to be improved, and the afterglow time is short.

Active Publication Date: 2022-06-14
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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  • A red long afterglow luminescent material and preparation method thereof
  • A red long afterglow luminescent material and preparation method thereof
  • A red long afterglow luminescent material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] a) Weighing calcium carbonate, tin dioxide and europium oxide in the stoichiometric molar ratio Ca:Sn:Eu=2:1:0.01, relative to the matrix CaSnO 3 The add-on is 20mol% to take by weighing boric acid;

[0037] b) adding water to the mixture in step a), the amount of water is 2 times the weight of the mixture, and the wet blending and grinding are performed for 1 h;

[0038] c) drying the uniformly mixed raw materials after grinding in step b), the drying temperature is 150°C, and the drying time is 2h;

[0039] d) grinding the dried raw material in step c) into powder, using pulverized coal as a reducing agent, and carrying out 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) taking out the calcined sample in step d) and grinding to obtain a red long afterglow luminescent material.

Embodiment 2

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

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

[0044] c) drying the uniformly mixed raw materials after grinding in step b), the drying temperature is 200°C, and the drying time is 1h;

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

[0046] e) taking out the calcined sample in step d) and grinding to obtain a red long afterglow luminescent material.

Embodiment 3

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

[0049] b) adding 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 2h;

[0050] c) drying the uniformly mixed raw materials after grinding in step b), the drying temperature is 60°C, and the drying time is 6h;

[0051] d) grinding the dried raw materials in step c) into powder, and using 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 8h;

[0052] e) taking out the calcined sample in step d) and grinding to obtain a red long afterglow luminescent material.

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PUM

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Abstract

The invention discloses a red long afterglow luminescent material, which is characterized by a double-matrix system and has a chemical formula of CaS / CaSnO 3 : Eu, Ln, wherein Ln is a combination of one or more elements in Dy, Tb, Er, Ho, Pr, La, Sm, Ce, Nd, Y, Tm, Yb, Lu and Gd; the present invention also discloses The preparation method of the above-mentioned red long-lasting luminescent material is described. The red long-lasting luminescent material prepared by the present invention does not need to be excited by strong light or short-wavelength (such as ultraviolet) light, but can be excited by ordinary visible light. The excited material has excellent long-lasting Afterglow performance, and matrix stability is significantly improved. Compared with sulfide-based long-lasting luminescent materials, it can significantly improve its chemical stability, especially the defect that sulfide is prone to deliquescence; compared with stannate-based long-lasting luminescent materials, it can extend the wavelength of excitation light to the visible light range, It can be excited by ordinary visible light, which expands its application field.

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) are a new class of energy-saving and energy-storage materials that can effectively absorb excitation light (such as sunlight) and continue to emit light for a long time after excitation is stopped. It has broad application prospects in the fields of emergency indication, building decoration, optoelectronic components, biological imaging, clinical medicine and energy and environmental engineering. Existing long afterglow luminescent materials in the visible light region are mainly divided into blue, green and red long afterglow luminescent materials, among which blue (such as Sr 2 MgSi 2 O 7 :Eu 2+ ,Dy 3+ , afterglow time > 25h) and green (such as SrAl 2 O 4 :Eu 2+ ,Dy 3+ , afterglow time>15h) The afterglow bri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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