A blue-green silicate ultra-long afterglow luminescent material and its preparation method

A technology of long afterglow luminescence and luminescent materials, which is applied in the direction of luminescent materials, chemical instruments and methods, etc., to achieve the effect of low cost and energy saving
CN107974250BInactive Publication Date: 2020-05-08LANZHOU UNIVERSITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
LANZHOU UNIVERSITY
Publication Date
2020-05-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a blue-green silicate long afterglow luminescent material and a preparation method thereof. The chemical expression of the luminescent material is Ba0.9975Si2O5:Eu0.0025, Rx,wherein R is one or two of Dy, Pr, Ce, Nd, Tm, Sm, Yb, Gd, Er, Tb or Ho, and x is more than or equal to 0.005 and less than or equal to 0.050. The preparation method comprises the steps of respectively weighing raw materials according to a stoichiometric ratio, grinding the weighed raw materials, and evenly mixing to obtain raw material powder; carrying out calcination, cooling, and then grindingto obtain the ultra-long blue-green silicate long afterglow luminescent material. According to the preparation method, Eu<2+> is used as activation ions, one or two of trivalent rare earth ions such as Dy<3+> and Nd<3+> are used as co-activation ions, a co-solvent is not added, and calcinations is carried out at low temperature; the luminescent material prepared by the method can emit blue-green ultra-long afterglow after being excited by light with a wavelength of 200-400 nm. The blue-green silicate long afterglow luminescent material has the advantages of being simple, free from pollution, energy-saving and low in cost.
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Description

technical field

[0001] The invention belongs to the technical field of luminescent materials, and relates to a luminescent material, in particular to a blue-green silicate ultra-long afterglow luminescent material, and also relates to a preparation method of the luminescent material. Background technique

[0002] Long-lasting luminescent material is a kind of photoluminescent material, which generates light under the excitation of an external light source, absorbs light energy and stores it at the same time, and then slowly releases the stored energy in the form of light after the excitation stops. The duration of afterglow is called afterglow time, the afterglow less than 1μs is called ultra-short afterglow, the one between 1 and 10μs is called short afterglow, the one between 10μs and 1ms is called medium and short afterglow, and the one between 1 and 100ms is called medium afterglow. Those between 100ms and 1s are called long afterglow, and those longer than 1s are called...

Claims

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