Preparation method of full-spectrum-region near-infrared up-and-down conversion material

Abstract

The invention discloses a preparation method of a full-spectrum-region near-infrared up-and-down conversion material. The full-spectrum-region near-infrared up-and-down conversion material comprises amain body matrix material, namely sodium fluoride; a precursor is prepared in a reaction kettle by utilizing a microwave method; then a nano-material with controllable granularity is prepared in an inert gas environment through low-temperature sintering; mutual regulation and control of up-conversion and down-conversion characteristic responses can be realized through adjusting rare-earth elements and doping concentration; the material can emit down-conversion responses of 400 to 630 nm under the stimulation of a light source with the wavelength of 200 to 400 nm of an ultraviolet region; thematerial has near-infrared down-conversion radiation at 1030 nm and 1550 nm under the stimulation of a light source with the wavelength of 800 to 1200 nm of a near-infrared region; meanwhile, the material emits up-conversion emission of visible light with the wavelength of 530 to 600 nm under the stimulation of a light source with the wavelength of 900 to 1080 nm of the near-infrared region through regulating and controlling the concentration of a stimulator; the full-spectrum-region near-infrared up-and-down conversion material can be directly applied to biological monitoring, has a relatively good application direction in the field of biological imaging, and meanwhile, has a relatively good application prospect in the field of multiple anti-counterfeiting.

Description

technical field [0001] The invention belongs to the preparation technology of light-emitting materials in the field of light-excited light-emitting. Background technique [0002] Existing inorganic light-emitting materials are commonly classified into infrared up-conversion light-emitting materials and ultraviolet down-conversion light-emitting materials. The up-conversion luminescent material is mainly excited by an infrared light source to irradiate the luminescent material, and the luminescent material emits visible light; the ultraviolet luminescent material is mainly irradiated by ultraviolet light and blue light to produce visible light emission. The above two materials are widely used in biomarkers, lighting, In display and anti-counterfeiting materials; in past studies, light in the ultraviolet or visible wavelength range was often used as an excitation light source for fluorescent materials. The light energy in the ultraviolet and visible wavelength ranges is relat...

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Problems solved by technology

[0004] Chinese patents CN 107227152 A and CN 106753353 A disclose a carbon quantum dot material with near-infrared emission function. The method includes the following steps: dissolving the carbon precursor in a liquid organic compound to form a mixed reaction solution, and heating , forming a dark green solution, and the solid matter separated from the dark green solution is the carbon dot after washing; the inventive method overcomes the difficulty in preparation, high cost, and short emission wavelength of the prepared carbon dots in the existing method The drawbacks of this method are that the near-infrared-emitting polymer carbon dots can be obtained through a simple one-step hydrothermal synthesis of two molecules, which is low in cost and high in output, and is suitable for mass production. However, since the raw materials used are organic materials, the service life of the materials shorter

Chinese patent CN104277822 A discloses 800 nm near-infrared excitation, 1525 nm short-wave infrared emission fluorescent nanomaterial and its synthesis method. The inventive fluorescent nanomaterial is a core-shell structure nanocrystal material with one core and three shells. The nuclear center, the short-wave infrared light-emitting layer, the energy transfer layer and the energy absorption layer are composed of four parts, so that the excitation light is extended from 980nm to about 800nm, and the energy transfer process of Nd3+→Yb 3+→Er 3+ is realized. This method can Realize wide-band near-infrared absorption, but due to the complex synthesis process and difficult control of the process, the yield is low, which greatly increases the production cost and is not conducive to mass production

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