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Red long-afterglow single crystal material and preparation method thereof

A single crystal material, crystal material technology, applied in the direction of polycrystalline material growth, single crystal growth, crystal growth, etc., to achieve the effect of low cost, high application potential and excellent performance

Active Publication Date: 2019-01-08
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the long afterglow phenomenon based on lithium niobate crystals has not been reported so far.

Method used

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  • Red long-afterglow single crystal material and preparation method thereof
  • Red long-afterglow single crystal material and preparation method thereof
  • Red long-afterglow single crystal material and preparation method thereof

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Embodiment 1

[0025] (1) Prepare high-purity lithium carbonate and niobium pentoxide according to the molar ratio Li / Nb=0.946:1, add magnesium oxide and praseodymium oxide powder, mix them, and place them in a ball mill to grind and mix for 48 hours.

[0026] (2) Add the homogeneous mixed powder obtained in step (1) into a platinum crucible, place it in a muffle furnace and raise the temperature to 700°C, keep it for 3 hours, then raise the temperature to 1150°C at a rate of 250°C / hour and keep it for 10 hours , and then slowly lowered to room temperature, to the polycrystalline material.

[0027] (3) Put the polycrystalline material described in step (2) in a platinum crucible, place the crucible in a pulling method growth device, heat it to above 1230°C, and use a c-cut seed crystal to seed the crystal along the c-axis growth. Through the automatic temperature control technology, the temperature gradient of the solid-liquid interface for crystal growth was maintained at 28°C / mm, the crys...

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Abstract

The invention discloses a red long-afterglow crystal material and a preparation method thereof. The long-afterglow material is a single crystal with a structure belonging to the trigonal system, is ofABO3 type and has chemical formula of LiNbO3:Mg<2+>, Pr3<+>. In the formula, LiNbO3 is the matrix, Mg<2+> and Pr3<+> are doping components. The doping component Mg<2+> accounts for 1mol%-6mol% of thematrix, and the doping component Pr3<+> accounts for 1mol%-3mol% of the matrix. The preparation method comprises the steps of batching, pre-sintering and pulling growth. The red rare earth long-afterglow luminescent crystal can be excited by ultraviolet light irradiation or X-ray irradiation to emit red light (central wavelength 619 nm) and has long afterglow. The material can be applied to application occasions such as ultraviolet light and X-ray detection, optical storage, safety identification, high temperature sensing, force sensing and the like, and has the advantages of low cost, high thermal stability, mechanical stability and the like.

Description

technical field [0001] The invention belongs to the field of long afterglow luminescent materials, and in particular relates to a red long afterglow material and a preparation method thereof. Background technique [0002] Long afterglow material refers to the optical phenomenon that the material continues to emit light for a long time in the visible or near-infrared band after receiving high-energy excitation (visible light, ultraviolet light, X-rays, rays, and electron beams, etc.). Such luminescence can last for several minutes, several hours or even several days after the excitation is stopped. Based on this special function, long afterglow materials are widely used in many fields such as security signs, light energy storage, force and temperature sensors, biological imaging, cancer treatment, solar photoelectric conversion and photocatalysis. In recent years, the research on long afterglow materials has mainly focused on expanding the range of excitation and emission an...

Claims

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Application Information

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IPC IPC(8): C30B29/30C30B15/36
CPCC30B15/36C30B29/30
Inventor 林少鹏龙思卫马德才熊宸玮王彪
Owner SUN YAT SEN UNIV
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