Upconversion Luminescence Enhancement And Application Of Rare Earth Doped Glass-ceramics

Rare earth doped fluoride glass-ceramics are considered to be one of the most promising up-conversion materials because of their excellent luminescence stability,obvious peak position and long fluorescence lifetime.They have wide application prospects in lighting,three-dimensional display,optical data storage,optical switches,sensors,super-resolution fluorescence imaging,solar cells and other fields.In this paper,high transparency oxyfluoride glass-ceramics were prepared by component design and their fluorescence properties and up-conversion mechanism were studied.Their fluorescence temperature sensing properties were explored and high sensitivity was obtained.Finally,the dual-wavelength up-conversion fluorescence properties of the glass were studied.The main contents of this paper are summarized as follows:Transparent Er³⁺doped glass-ceramics containing KEr₃F₁₀ nanocrystals were prepared via traditional melt-quenching technique.Their micro-structures,optical properties and up-conversion luminescence behaviors of the Er³⁺doped glass-ceramics were systemically studied by using X-ray diffraction,absorption and up-conversion luminescence spectra.Under the excitation of laser at 980 nm,the intensity of red emission of the glass-ceramics increases more than 70 times after heat treatment compared with that of the precursor glass ceramic.Moreover,the fluorescence intensity ratio of the thermally coupled energy levels(²H_11/21/2 and⁴S_3/2)shows a good linear relationship with temperature and maintains relative high sensitivities of 0.398%per K at 303-573 K,which indicates that the glass ceramics have promising applications in temperature detection.Transparent glass-ceramics containing KYb_xEr_3-xF₁₀0 and KZnF₃ nanocrystals were successfully prepared by reasonably designing the composition of ox fluoride glass.From the XRD spectrum,it can be seen that a small amount of microcrystalline has been formed in the process of melting and quenching of glass-ceramics.After adding sensitizer ions,the up-conversion fluorescence emission of the sample increased significantly,which was more than 1000 times higher than that of the single-doped samples.The up-conversion fluorescence characteristics and energy transfer mechanism of the sample were analyzed.In addition,based on the fluorescence intensity ratio?FIR?technology,the temperature sensing properties of KYb_xEr_3-xF₁₀0 and KZnF₃ glass-ceramics have been studied.the fluorescence intensity ratio of the thermally coupled energy levels(²H_11/21/2 and ⁴S_3/2)shows a good linear relationship with temperature and maintains relative high sensitivities of 0.234%per K at 303-573 K,which indicates that the glass ceramics have promising applications in temperature detection.Transparent glass-ceramics containing KEr₃F₁₀ and KZnF₃ nanocrystals were successfully prepared by reasonable design of glass composition.The structure of the material was analyzed by XRD and TEM,and the dual-wavelength up-conversion fluorescence properties and enhancement mechanism of the material were explored.The different dual-wavelength up-conversion luminescence properties in glass and glass-ceramics were studied.This study has certain significance for further understanding the mechanism of dual-wavelength up-conversion luminescence,and also for further application.The cable laid a good foundation.