A kind of near-infrared fluorescent powder and its preparation method and application

Abstract

The invention discloses near-infrared fluorescent powder. A chemical general formula of the near-infrared fluorescent powder is Mg(3-x)Ga2CrxGeO8, wherein x is greater than 0 and is smaller than or equal to 0.1. The invention also discloses a preparation method of the near-infrared fluorescent powder. The preparation method comprises the following steps: weighing oxide or carbonate containing elements of Mg, Ga, Cr and Ge according to molar proportions of all elements in the chemical general formula Mg(3-x)Ga2CrxGeO8 of the near-infrared fluorescent powder, mixing, and grinding, thus obtaininga mixture; heating the mixture to 1200 to 1300 DEG C, and roasting for 3 to 4 hours, thus obtaining a sintered body; cooling the sintered body to room temperature, and fully grinding, thus obtainingthe near-infrared fluorescent powder. Meanwhile, the invention discloses application of the near-infrared fluorescent powder. The near-infrared fluorescent powder provided by the invention has longerexcitation wavelength and cannot be easily absorbed by a living body, an emission spectrum is in wide spectrum emission, the wavelength covers 700 to 1200nm which can cover one part of a first windowand a second window of a body biological window, the luminous strength is high, the stability is high, the preparation technology of the near-infrared fluorescent powder is simple, operation and control are easy, the safety is high, the preparation time is short, and the near-infrared fluorescent powder is convenient for large-scale production as well as popularization and application.

Description

technical field [0001] The invention relates to a luminescent material and its preparation method and application, in particular to a near-infrared fluorescent powder and its preparation method and application. Background technique [0002] The near-infrared light region is a non-visible light region discovered earlier by people. Due to the low level of early technology, it is affected by frequency doubling and frequency combination, resulting in spectral overlap and complex analysis, which leads to certain restrictions on the research and application of near-infrared light. Until the 1960s, with the emergence of commercial instruments and a lot of work done by Norris et al., they proposed the theory that the content of the substance was linearly related to the absorption peaks at multiple different wavelength points in the near-infrared region, and used NIR diffuse reflectance technology The determination of moisture, protein, fat and other components in agricultural produc...

AI Technical Summary

Problems solved by technology

For example, the new broadband infrared LED launched by Osram Opto Semiconductors applied phosphor technology to infrared emitters for the first time, created infrared spectroscopy technology suitable for the consumer market, and applied it to the food industry, agriculture and other industries to measure moisture in food , fat, carbohydrate, sugar or protein content, etc.; however, this technology relies on near-infrared phosphors that can emit a broad spectrum, and most of the emission spectra of current near-infrared phosphors do not meet the requirements for their use. Therefore, the industry's It is necessary for R&D personnel to develop more near-infrared phosphors with a wide emission spectrum, to provide more material options for near-infrared phosphors required by Osram light beads, and to provide near-infrared phosphors for food detection, biological detection, and biological imaging. More options

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