Rare earth doped glass frequency conversion luminous material and preparation method thereof

Abstract

The invention discloses a rare earth doped glass frequency conversion luminous material and a preparation method thereof. The luminous material is formed by fluoride glass ceramics containing rare earth ions and silver nanoparticles. The preparation method comprises the steps of firstly preparing glass containing rare earth ions, secondly preparing the glass into the glass ceramics containing fluoride crystals through the heat treatment technology, and thirdly soaking the glass ceramics in a mixed salt melt containing silver nitrate to undergo ion exchange, thus obtaining the rare earth doped frequency conversion luminous material jointly enhanced by the silver nanoparticles and fluoride microcrystals. The obtained luminous material has the beneficial effects that the luminous material has good optical property and thermal stability; through irradiation of exciting light, by utilizing the local field enhancement effect of the silver nanoparticles, the rare earth ions in a low phonon energy environment created by the fluoride microcrystals achieve high frequency conversion luminous efficiency which can be maximally enhanced by 30 times, thus effectively making up for the problem of low rare earth ion doped glass frequency conversion luminous efficiency.

Description

technical field [0001] The invention provides a rare earth-doped glass frequency conversion luminescent material and a preparation method thereof, belonging to the technical field of frequency conversion luminescent materials. Background technique [0002] Rare earth-doped frequency conversion luminescence technology has great potential application value in the fields of solid-state laser, data storage, general lighting, three-dimensional display, microscopic imaging, sensing technology, solar cells, anti-counterfeiting technology and military confrontation. Glass has the following advantages as a matrix material: the concentration of rare earths in the glass is high, the energy level splitting of rare earth ions and the phenomenon of fluorescence emission are non-uniform broadening; the matrix composition adjustment and pump light source selection range is wide; the preparation The technology is mature and the cost is low. Therefore, the glass-based rare-earth-doped freque...

AI Technical Summary

Problems solved by technology

[0003] However, rare earth-doped frequency conversion luminescent materials based on glass still face a lot of difficulties in practical applications, such as: the frequency conversion luminous efficiency is not high-mainly affected by the host glass and rare earth ions themselves (such as phonon energy, oscillator strength, etc.) , refractive index and absorption cross-sectional area, etc.) are affected by factors such as low incident light absorption rate, high multiphonon relaxation rate and large phonon energy; it is difficult to improve the frequency conversion efficiency under the traditional preparation process - the main reason is that rare earth ions Factors such as energy level characteristics, doping concentration, and glass matrix structural properties have a great influence on the cross-relaxation rate between energy levels of rare earth ions, making it difficult to determine the effective doping concentration of luminescent rare earth ions in the matrix glass prepared by the traditional melting process. big improvement

The above factors have seriously restricted the application range and prospects of this type of frequency conversion materials.