Preparation method of near infrared super-long afterglow luminescence nanomaterial

Abstract

The invention relates to a preparation method of a near infrared super-long afterglow luminescence nanomaterial. The near infrared super-long afterglow luminescence nanomaterial is prepared by a citric acid sol-gel method. The method comprises the following steps: uniformly mixing a zinc ion solution, a gallium ion solution, a germanium ion solution, a chromium ion solution and a trivalent rare earth metal ion solution, adding a citric acid aqueous solution into the above mixture solution and stirring up at room temperature; making the mixture solution slowly evaporate at 80 DEG C to form gel; carbonizing the gel at 210 DEG C and grinding the carbonized gel by with a mortar, and then calcinating the ground gel at 1000 DEG C in a muffle furnace; grinding the calcinated product with the mortar and adding distilled water, and finally fully ultrasonically dissolving and centrifugally separating the mixture, so as to prepare a near infrared super-long afterglow luminescence nano grain with mean grain size of equal to or less than 100 nm. The preparation method has the following advantages that the size of the prepared long afterglow material is small, the emission spectrum is in the near infrared region, the afterglow time is very long; and the preparation method does not need harsh equipment and conditions, the calcinations process does not require a reducing atmosphere, the operation is safe and convenient with low cost, the used equipment is common equipment, and the preparation method is easy to popularize and apply on large scale.

Description

technical field [0001] The invention relates to the field of preparation of long afterglow luminescent materials, in particular to a preparation method of near-infrared ultra-long afterglow luminescent nanoparticles. Background technique [0002] Long afterglow luminescent materials are also known as light-storing luminescent materials and luminescent materials. They are essentially photoluminescent materials, which absorb energy such as visible light, ultraviolet light, sunlight, X-ray, etc. It is widely used in lighting, information storage, high-energy ray detection, safety emergency instructions, transportation, safety and equipment marking and other fields. Although bulk long-lasting materials have developed rapidly in the past two decades, long-lasting nanomaterials are relatively scarce, especially near-infrared (650-1450 nm) long-lasting nanomaterials. Near-infrared long-lasting nano-luminescent materials have advantages that other traditional luminescent materials ...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the preparation conditions are harsh, special equipment is required, and the risk is high (explosive). In addition, the afterglow time of the silicate near-infrared long-glow nanomaterial based on divalent europium doping is relatively short (less than 30 hours), and the application prospect Restricted

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