Method for synthesizing rare-earth metal codoped yttrium potassium pentafluoride nano crystal from waste fluorescent powder

Abstract

The invention discloses a method for synthesizing rare-earth metal codoped yttrium potassium pentafluoride nano crystal from waste fluorescent powder. The method comprises the following steps: heating to disperse rare-earth ions, potassium bifluoride and potassium hydroxide in oleic acid so as to form a homogenized solution, and enabling the mixed components to react under a high temperature condition so as to generate ytterbium, europium and erbium codoped yttrium potassium pentafluoride nano crystal. By controlling the factors such as the concentration of rare-earth doped ions and the ratio of additives such as a potassium source, a fluorine source and oleic acid, the particle size and the intensity of visible light can be adjusted and controlled, and conversion of ultraviolet light and near-infrared light to visible light of multiple wavelengths can be achieved. The product prepared by using the method is uniform in morphology, controllable in size, high in light emission intensity, and can be used in fields such as photo-electron devices, electric light source illumination, solar batteries and biological fluorescent markers. The method is simple in preparation process, free of special equipment, low in cost, green and environment-friendly, and applicable to preparation and large-scale industrial production of multiple types of rare-earth up-conversion luminescence nano crystals.

Description

technical field [0001] The invention relates to a new technology for resource utilization of solid waste, especially suitable for the green high-value resource utilization of rare earth three-primary-color fluorescent powder waste, in particular to a rare earth secondary resource for preparing rare earth metal co-doped yttrium pentafluoride Methods for Potassium Nanomaterials. Background technique [0002] Rare-earth fluorescent up-conversion fluorescent materials refer to materials that can absorb long-wave radiation with low photon energy and emit short-wave radiation with high photon energy based on a two-photon or multi-photon mechanism when the material is excited by light. It is essentially an anti-Stokes glow. In recent years, up-conversion luminescent materials have broad application prospects in solid-state laser, three-dimensional display, infrared imaging, solar cells, especially as a new type of fluorescent marker in biomacromolecule analysis and biomedical clin...

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Problems solved by technology

[0006] CN104388087A discloses a method for preparing rare-earth fluorescent up-conversion materials with waste fluorescent powder. The method adopts ammonia precipitation and liquid separation-oxalic acid secondary precipitation process for rare earth leaching, but for extremely small amounts of elements such as lead and zinc in waste fluorescent powder Fail to effectively remove; meanwhile, CN104388087A adopts the mixture of anhydrous yttrium chloride and anhydrous europium chloride, MOH solid and MHF2 fine powder and RmF3 or RmCl3 solids are mixed in all solid phases, and the reaction is carried out, and the obtained nanocrystalline Large, with a particle size of more than 100nm, the dispersion is not uniform enough, and the rare earth ions cannot be fully doped into the lattice of the matrix material, resulting in insufficient luminescence performance of the rare earth fluorescent upconversion material, which limits its application in biomedicine, solar cells and other fields

Preparation of Eu from Waste Phosphors 3+ , Yb 3+ 、Er 3+ Doped alone or co-doped with K 2 YF 5 There is no corresponding report on the process of nanocrystal

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