Reversible Fluorescence Regulation and Temperature Sensing Properties of NaBiNb2O7-Based Photochromic Materials
In recent years,the design and development of light sensitive multifunctional materials have become a research hotspot.Rare earth-doped luminescent materials have attracted much attention due to their unique op-tical properties.In this paper,NaBiNb2O7∶0.01Er3+/xYb3+photochromic materials were synthesized by high-tem-perature solid-state reaction method.Under 405 nm irradiation,the samples change their color from light green to gray,and after thermal stimulation,the colored samples reversibly return to its initial state,exhibiting a typi-cal photochromic effect.In addition,the materials exhibit green(526 and 557 nm)and red(667 nm)upconver-sion luminescence under 980 nm excitation.Before and after 405 nm irradiation,the luminescence modulation contrast(△It)of upconversion luminescence is about 58.2％.Based on the luminescent intensity ratio(FIR)tech-nique,the optical temperature sensing performance of the sample was studied in the temperature range from 298 to 708 K using the thermally coupled energy levels(2H11/2 and 4S3/2)of Er3+ions,the optimized relative sensitivi-ty(Sr)reaches up to 1.18％·K-1.These results provide a good method for designing multifunctional optical tem-perature sensing performance.
NETL
NSTL
万方数据
