Reversible Control And Application Of The Spectrum Of Color-changing And Luminescent Materials Under External Field Stimulatio

The application of reversible photochromic luminescent materials induced by external stimuli is not to be underestimated,as it involves multiple fields.In this case,many different families of photochromic luminescent materials have been developed,but because the research on these color-changing materials under different external stimuli is mainly focused on organic systems,there are still many practical applications that are limited.Solid-state inorganic luminescent photochromic technology has good chemical and thermal stability,making it potentially useful in high-density optical storage fields.However,the inability to simultaneously achieve high luminescence contrast and non-destructive read-out capability has limited their practical applications.Therefore,the continuous development and optimization of performance is an important issue,enabling convenient external stimuli color-changing and luminescent materials to serve all aspects of our lives.Thus,in this work,two different reversible photochromic materials were prepared and their photochromic properties and applications were studied through two different external stimuli.The x-ray induced photochromic Mn²⁺doped Ba₃Mg Si₂O₈ phosphor（BMS:Mn）was prepared by high temperature solid phase method at 1350℃,and the X-ray color change effect of BMS:Mn was investigated.BMS:Mn photochromic phosphors can be reversibly bleached under 254 nm light irradiation,which has good reversibility.The color-centered structure formed by the electron leap of the oxygen vacancy defect causes the color change under X-ray irradiation.This color-centered structure also affects the absorption of incident light and the utilization of absorbed energy,leading to changes in color and photoluminescence intensity.Finally,the made phosphor is compounded with PDMS in a certain ratio to prepare a flexible film,which realizes its photochromic and long afterglow dual-mode simultaneous imaging and detection as well as 3D imaging applications.It provides a strategy for designing high-performance phosphorus-based flexible X-ray detectors and high stability images.Rare earth ion Eu³⁺-doped Li Nb₃O₈ reverse photochromic luminescent materials（LNO:Eu）were prepared by high-temperature solid-phase method.The LNO:Eu underwent reverse photochromic change from blue-black to off-white under light irradiation（808 nm laser）,and bleaching could be achieved under heat treatment.The luminescence modulation rate of LNO:Eu luminescent powder can be close to 100%under 808 nm laser irradiation for 10 s.The valence change of Nb element in LNO:Eu reveals the reversible color change mechanism.The photochromic and down-transfer luminescence modulation of LNO:Eu were studied under the alternating stimulation of 808 nm laser irradiation and heat treatment,and both the photochromic and luminescence modulation of LNO:Eu showed good reversibility and stability.Finally,the use of laser writing enables optical storage that can be visualized in bright and dark fields.New insights for future high-performance inorganic photochromic materials are provided and their practical application in advanced optical storage is promoted.