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A long afterglow luminescent material and its preparation method

A technology of long-lasting luminescence and compounds, which is applied in the direction of luminescent materials, chemical instruments and methods, etc. It can solve the problems of different decay times of long-lasting phosphors, and achieve the effects of stable chemical properties, low production costs, and no radioactivity

Active Publication Date: 2018-07-27
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the different decay times of long-lasting phosphors of various colors, it is impossible to achieve this goal through the three primary colors of red, green and blue for long-lasting luminescence. Therefore, it is necessary to develop long-lasting materials of various colors

Method used

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  • A long afterglow luminescent material and its preparation method
  • A long afterglow luminescent material and its preparation method
  • A long afterglow luminescent material and its preparation method

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preparation example Construction

[0031] The present invention also provides a preparation method of the above long afterglow luminescent material, comprising the following steps:

[0032] A) K-containing compounds, Na-containing compounds, Li-containing compounds, M-containing compounds, R-containing compounds, Ga-containing compounds, Al-containing compounds, Ge-containing compounds, Si-containing compounds and Bi-containing compounds Compounds are mixed and ground to obtain a mixture;

[0033] B) Sintering the mixture to obtain a long-lasting luminescent material.

[0034] In the present invention, the compound containing K, the compound containing Na, the compound containing Li, the compound containing M, the compound containing R, the compound containing Ga, the compound containing Al, the compound containing Ge, the compound containing Si and the compound containing Compounds of Bi are mixed and ground to obtain a mixture;

[0035] Wherein, the K-containing compound is potassium carbonate or potassium ...

Embodiment 1

[0047] Will K 2 CO 3 (analytical pure), Ga 2 o 3 (analytically pure), GeO 2 (analytical pure) and Bi 2 o 3 (99.99%) as raw materials, the molar ratio between them is 0.495:0.5:1:0.005, accurately weigh the above substances, and fully grind them evenly in an agate mortar, put them into a corundum crucible, and heat them in a high temperature furnace at 1200 ℃ for 3 hours, naturally cooled to room temperature, and then ground to obtain a white powder sample whose chemical composition is K 0.99 GaGeO 4 :0.01Bi 3+ . Its excitation and emission spectra are figure 2 shown. After the sample is excited by 254nm ultraviolet light, it emits a cyan long afterglow, image 3 a is the afterglow spectrum, the main peak is located near 495nm. And the test results show that the afterglow time of the sample can reach 5h (>0.32mcd / m 2 ).

[0048] Carry out X-ray diffraction analysis to the sample that embodiment 1 obtains, instrument used is German Bruker / D8-FOCUS X-Ray Diffractom...

Embodiment 2

[0053] Will K 2 CO 3 (analytical pure), Ga 2 o 3 (analytically pure), GeO 2 (analytical pure) and Bi 2 o 3 (99.99%) as raw materials, the molar ratio between them is 0.49995:0.5:1:0.00005, accurately weigh the above substances, and fully grind them evenly in an agate mortar, put them into a corundum crucible, and place them in a high temperature furnace at 1100 ℃ roasting for 6 hours, naturally cooled to room temperature, and then ground to obtain a white powder sample, whose chemical composition is K 0.9999 GaGeO 4 :0.0001Bi 3+ . The XRD diffraction pattern, fluorescence spectrum and afterglow spectrum properties of the long-lasting luminescent material are similar to those of Example 1. Afterglow time up to 3h (>0.32mcd / m 2 ).

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Abstract

The present invention provides a long afterglow luminescent material, the chemical formula of which is shown in formula (I): K1-x-y-z-a-bLiaNabGa1-cAlcGe1-dSidO4: xBi3+, yM2+, zR3+, formula (I); formula ( In I), M is one or more of Mg, Ca, Sr, Ba and Zn; R is Sc, Y, La, Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Tm One or more of , Yb and Lu; 0.0001≤x≤0.20, 0≤y≤0.20, 0≤z≤0.20, 0≤a≤0.20, 0≤b≤0.20, 0≤c≤0.20, 0≤ d≤0.20. The long afterglow luminescent material provided by the present invention uses Bi3+ ions as active ions, which can be effectively excited by ultraviolet light to produce cyan-blue color with adjustable long afterglow, high afterglow brightness and long time.

Description

technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a long afterglow luminescent material and a preparation method thereof. Background technique [0002] Long afterglow luminescent materials are also called light-storing luminescent materials, which are essentially a kind of photoluminescent materials. They can store external light radiation energy (such as ultraviolet light and visible light, etc.), and store the stored energy at room temperature. Slowly released in the form of visible light. As a new type of energy-saving low-vision lighting material, long-lasting luminescent materials are widely used in the fields of building flaw detection and luminous indication. Such materials can also be further made into luminescent coatings, luminescent coating films, luminescent fire safety signs, luminescent inks, luminescent ceramics, luminescent plastics, luminescent fibers, luminescent paper, etc. Widely u...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/66
CPCC09K11/745C09K11/7758
Inventor 李成宇孙文芝庞然姜丽宏张粟
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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