Research On The Preparation And Reversible Regulation Of Luminescence Of Rare Earth Doped Photochromic Glass And Its Optical Storage Applicatio

Transparent glass with photochromic and luminescent properties has become an attractive material due to its exciting prospects in fields such as information encryption and three-dimensional optical storage.However,currently reported tungsten phosphate glasses with photochromic effects require thermal assistance for bleaching,and the extent of optical information storage is limited to the visible light range.Compared with two-dimensional materials such as photochromic films and ceramics,transparent glass media can achieve three-dimensional optical information storage due to its high transparency.In addition,rare earth ions have rich luminescent energy levels,and their luminescent properties can be regulated through external field stimulation.Photochromic glass regulates luminescence based on the degree of color change,thereby achieving optical information readout.Therefore,it is of great significance to achieve the regulation of the luminescence performance of photochromic glass under full light stimulation,as well as to expand the dimension and security of its optical information storage.（1）Rare earth Eu F₃doped Ag Cl microcrystalline transparent glass was prepared by high-temperature solid-state melting and subsequent heat treatment.Under alternating 365 nm light and 690 nm laser stimulation,the glass exhibited reversible photochromic properties,achieving a high color contrast（91%）from high transparency to black state,and exhibiting high fatigue resistance.The mechanism of photochromism was confirmed through in-situ XPS,TEM,etc.,which is due to the formation and decomposition of silver nanoparticles in the glass matrix.Due to the overlap of the luminescence peak of Eu³⁺ions with the absorbance of the color changing glass,the color changing glass achieved high luminescence regulation（93%）under the excitation of a 532 nm light source.Based on this,the process of optical writing,reading,and erasing of complex optical information in light regulated glass was further demonstrated,proving that optical information can be recorded and erased in glass,and has good re-writability and re-erasability.This result highlights a new strategy to explore an entirely photostimulation induced photochromic glass,which can be used for applications such as 3D dual mode optical storage and information encryption,and is of great significance for expanding its new applications in the field of optoelectronics.（2）In order to further improve the security of optical information storage,rare earth doped bismuth based glass was prepared using the same method.The glass was manipulated by a 473 nm laser to produce obvious color change characteristics,changing from a transparent yellow state to a red state.Under 808 nm laser excitation,the photochromic bismuth based glass produced strong near-infrared luminescence,which is due to the laser induced generation of low valence bismuth ions.Therefore,laser irradiation of glass can selectively control the color change of micro regions,thereby achieving selective writing of near-infrared luminescence.Rare earth ions have unique absorption peaks,which weaken the near-infrared luminescence generated by color changing glass,such as rare earth Dy³⁺and Sm³⁺ions.To achieve excellent visible and near-infrared luminescence simultaneously,Eu³⁺ion doping is selected.Based on the photochromic effect,both visible and near-infrared luminescence can be controlled simultaneously.Due to the invisibility of near-infrared luminescence to the naked eye,the process of writing complex optical information and deep encryption of information was demonstrated,greatly improving the security of optical information storage.The transparency of glass was utilized to achieve direct writing of photochromic and near-infrared luminescence 3D patterns.