Method for rapid in-situ preparation of rare earth fluoride-rare earth oxide heterojunction micro-nano material

Abstract

The invention discloses a method for rapid in-situ preparation of a rare earth fluoride-rare earth oxide heterojunction micro-nano material, which utilizes the plasmon heat effect of a noble metal nano structure, takes a small-size gold nano island structure with a large absorption interface as a heat source, under the action of an external light field with resonant wavelength, the gold nano island structure generates an extremely high temperature in an extremely short time, and the extremely high temperature is transmitted to the rare earth luminescent material, so that the local temperature of the rare earth luminescent material is instantly increased; meanwhile, hot electrons generated by surface plasmon relaxation catalyze oxygen molecules adsorbed on the surface of the luminescent material to activate the oxygen molecules, so that oxidation reaction of the luminescent material is promoted, and the luminescent material is instantaneously phase-changed into rare earth oxide under the dual effects of instantaneous high temperature and activated oxygen. The surface plasmon heat effect is utilized, preparation of the heterojunction micro-nano material formed by combining the rare earth fluoride and the rare earth oxide which are not matched in crystal lattices is achieved on the single-particle level, the method is simple and easy to implement, the method can be carried out at the room temperature, the reaction time is short, and the needed exciting light power density is small.

Description

technical field [0001] The invention belongs to the technical field of preparation of rare earth ion-doped inorganic heterojunction luminescent materials, and specifically relates to a method for rapidly and in-situ preparing heterostructure micro-nano materials by combining rare earth fluorides and oxides. Background technique [0002] In recent years, there has been increasing interest in developing the combination of two or more materials with different properties to prepare heterostructured materials with comprehensive advantages, ideal size, shape, and function. Fluorinated materials doped with rare earth ions are widely used in many fields due to their superior and unique fluorescence properties, such as three-dimensional display, solar photoelectric conversion, optical information transmission, solid-state laser materials and fluorescence detection, etc. Rare earth oxide materials are widely used in many fields such as biology, medicine, and electronic devices due to ...

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Problems solved by technology

[0004] In summary, the existing methods for the preparation of heterostructures have complicated synthesis processes, especially the preparation methods of rare earth oxides usually need to be carried out under high temperature conditions, the reaction time is long, the energy conversion efficiency is low, and most of the products have irregular shapes. Poor dispersion, which greatly limits its application in biology, medicine and other fields

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