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Novel white steady persistence afterglow luminescence material and preparing method thereof

A long afterglow luminous, white technology, applied in the direction of luminescent materials, chemical instruments and methods, etc., can solve the problems that white long afterglow materials cannot be directly obtained, difficult to realize, and white light cannot be maintained, and achieve excellent afterglow performance, good color purity, The effect of simple material synthesis method

Active Publication Date: 2017-09-15
BEIJING JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the different attenuation of different colors of light in the same or different materials, the color of the light will change as time changes, and the white light cannot be maintained.
Therefore, in order to ensure that the white light in the white long-lasting luminescent material does not change in color, it is necessary to make the attenuation of monochromatic light consistent or directly obtain white light instead of producing white light through the superposition of light, and the attenuation of the two kinds of light is exactly the same. technically very difficult to achieve
[0005] Therefore, the present invention provides a novel white long afterglow luminescent material, which solves the problem that white long afterglow materials cannot be directly obtained in the same matrix

Method used

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  • Novel white steady persistence afterglow luminescence material and preparing method thereof
  • Novel white steady persistence afterglow luminescence material and preparing method thereof
  • Novel white steady persistence afterglow luminescence material and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A novel white long afterglow luminescent material, the preparation steps are as follows:

[0039] Weigh the raw materials zinc oxide and germanium oxide according to the stoichiometric ratio of 3:2, put the weighed raw materials into an agate mortar, fully grind for half an hour, and mix well. Transfer the uniformly mixed raw materials to the corundum crucible, put the crucible into the muffle furnace, raise the temperature to 1350°C at a rate of 8°C / min±2°C / min, keep the temperature for 2.5 hours to synthesize the sample, and cool it to room temperature naturally with the furnace Take it out, and use X-ray single crystal diffraction to characterize its crystal structure, such as figure 1 , indicating that the obtained samples belong to the Zn 2 GeO 4 Rhombohedral system.

Embodiment 2

[0041] A novel white long afterglow luminescent material, the preparation steps are as follows:

[0042] Weigh the raw materials zinc oxide and germanium oxide according to the stoichiometric ratio of 3:2 and put them into an agate mortar, grind them thoroughly for half an hour, mix them evenly, transfer the raw materials to a corundum crucible, put the crucible into a muffle furnace, and The temperature was raised to 1250°C at a rate of 8°C / min±2°C / min for 2.5 hours, and then naturally cooled to room temperature with the furnace to synthesize samples.

[0043] The prepared sample was irradiated with a 254nm ultraviolet lamp for 3 minutes and then tested with a CCD spectrometer for its initial afterglow spectrum. The test results are as follows: figure 2 As shown, the material has a broadband emission from 400nm to 700nm.

[0044] The afterglow of the obtained material lasts for 1 hour and is visible to the naked eye, and the decay of the afterglow is characterized. image ...

Embodiment 3

[0046] A novel white long afterglow luminescent material, the preparation steps are as follows:

[0047] Weigh the raw materials zinc oxide and germanium oxide according to the stoichiometric ratio of 3:2.5, grind and mix them evenly, transfer the mixture to a corundum crucible, burn at a constant temperature of 1250°C for 2.5 hours to synthesize a sample, and cool the synthesized sample to room temperature naturally with the furnace Take out and analyze its initial afterglow spectrum, such as Figure 4 As shown, the afterglow spectrum was analyzed with the color coordinate software CIE-1931. The chromaticity coordinates of the sample were (0.30, 0.40), and the luminescence of the sample fell within the white light area of ​​the chromaticity diagram.

[0048] Some Examples and Comparative Examples

[0049] Measure the influence of the ratio of the amount of raw materials on the product white long-lasting luminescent material, that is, the method steps are the same as in Examp...

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Abstract

The invention discloses a novel white persistent afterglow luminescence material. The molecular formula of the material is Zn2GeO4, with a main phase structure belonging to a rhombohedral system. The invention is synthesized using a high temperature solid phase method, in which ZnO and GeO2 are grinded, mixed, then calcined, and cooled to obtain the white persistent afterglow luminescence material. Zn2GeO4 in the invention has a band afterglow spectrum across 400 nm to 700 nm after being motivated by a 254 nm ultraviolet lamp, and emits white light observed by naked eyes, and after the light source is removed, the material still emit white persistent afterglow. The color purity of the material is good, the performance of the afterglow is good, and the synthesis method of the material is simple and easy to be achieved.

Description

technical field [0001] The invention relates to the technical field of long afterglow materials. More specifically, it relates to a novel white long-lasting luminescent material and a preparation method thereof. Background technique [0002] Long afterglow luminescent material belongs to photoluminescent material. It stores energy under the excitation of ultraviolet light and visible light. After the excitation stops, it slowly releases energy in the form of visible light. It is an energy-saving material and is widely used in emergency lighting, traffic signs, safety Instructions, decoration crafts, etc. So far, the relatively well-studied long-lasting luminescent materials cover most of the region from blue to red, but the white long-lasting materials that are most suitable for lighting sources are still far from the requirements for use. [0003] In the study of white long-lasting materials, people initially compounded two or more materials that emit different colors of ...

Claims

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Application Information

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IPC IPC(8): C09K11/66
CPCC09K11/662
Inventor 段晓霞袁满衣立新张希清徐征
Owner BEIJING JIAOTONG UNIV
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