Reversible upconversion(UC)luminescence modulation by external stimuli(i.e.electric field,magnetic field,and light irradiation)is extremely attractive for applications in a broad range of fields,such as photoswitches,...Reversible upconversion(UC)luminescence modulation by external stimuli(i.e.electric field,magnetic field,and light irradiation)is extremely attractive for applications in a broad range of fields,such as photoswitches,high-density optical data storage devices,and optical sensing.In this work,one kind of novel phosphor,Er^(3+)-doped Bi_(4)Ti3O12(Bi_(4-x)Er_(x)Ti_(3)O1_(2))ceramics,prepared by a conventional solid-state reaction approach,is reported which exhibits both bright UC luminescence and a remarkable photochromic(PC)effect.The UC luminescence,PC effect,and the coupling between UC and PC performances were investigated in detail.It is found that the UC luminescence could be readily modulated by alternating visible light irradiation and a thermal stimulus,and a large reversible luminescence regulation has been achieved based on the PC reaction.Meanwhile,the modulation of UC luminescence was shown to tightly depend on the irradiation time and thermal treatment processes.In addition,the coloration and decoloration processes also exhibited good fatigue resistance.The mechanisms related to the UC emissions,PC processes,and luminescence modulation are also discussed.These results indicated that Bi_(4-x)Er_(x)Ti_(3)O1_(2) samples could be potentially utilized as a kind of optical data storage material.展开更多
The advancements in the new industrial era demand higher standards for integrated intelligent sensors.These multi-parameter coupling sensors require sensing materials that can swiftly respond to various physical stimu...The advancements in the new industrial era demand higher standards for integrated intelligent sensors.These multi-parameter coupling sensors require sensing materials that can swiftly respond to various physical stimuli,including stress,temperature,humidity,etc.Mechanoluminescence(ML),with its unique mechanical–optical response,serves as an effective medium for stress sensing.In ML materials,constructing multiple luminescent centers not only enables multicolor ML but also allows for temperature sensing through the differential thermal quenching properties of various luminescent centers.In this study,we present an energy transfer strategy that leverages high-energy blue-emitting ML from the host material,combined with Tb^(3+) and Mn^(2+),to achieve multicolor ML.The mechanical response is correlated with the integrated intensity of ML,while the temperature response is governed by the dynamic ML intensity ratio of ITb/IMn.This approach simplifies the design of multifunctional sensors and facilitates remote,dual-mode sensing.Moreover,we develop a highly secure encryption system based on the integration of multicolor PL and ML with an ML-triggering mechanism that is both convenient and reliable.This work presents an effective strategy for developing multicolor ML materials and advancing multimodal sensing.展开更多
基金supported by the National Natural Science Foundation of China(No.51772326,51802343 and 11804384)the Scientific Research Project of Tianjin Education Committee(2018KJ254)+1 种基金the Undergraduate Training Programs for Innovation and Entrepreneurship of Tianjin(No.201910059053)the Fundamental Research Funds for the Central Universities(No.201917).
文摘Reversible upconversion(UC)luminescence modulation by external stimuli(i.e.electric field,magnetic field,and light irradiation)is extremely attractive for applications in a broad range of fields,such as photoswitches,high-density optical data storage devices,and optical sensing.In this work,one kind of novel phosphor,Er^(3+)-doped Bi_(4)Ti3O12(Bi_(4-x)Er_(x)Ti_(3)O1_(2))ceramics,prepared by a conventional solid-state reaction approach,is reported which exhibits both bright UC luminescence and a remarkable photochromic(PC)effect.The UC luminescence,PC effect,and the coupling between UC and PC performances were investigated in detail.It is found that the UC luminescence could be readily modulated by alternating visible light irradiation and a thermal stimulus,and a large reversible luminescence regulation has been achieved based on the PC reaction.Meanwhile,the modulation of UC luminescence was shown to tightly depend on the irradiation time and thermal treatment processes.In addition,the coloration and decoloration processes also exhibited good fatigue resistance.The mechanisms related to the UC emissions,PC processes,and luminescence modulation are also discussed.These results indicated that Bi_(4-x)Er_(x)Ti_(3)O1_(2) samples could be potentially utilized as a kind of optical data storage material.
基金supported by the Natural Science Foundation of Shaanxi Province of China(2024JC-YBMS-042),the National Natural Science Funds of China(52303293)the Science and Technology Research Program of Chongqing Municipal Education Commission(KJZD-M202301302 and KJQN202301314)+4 种基金the National Natural Science Foundation of China(12374368)the Liaoning Revitalization Talents Program(XLYC2203011)the Science Foundation for Outstanding Youth of Liaoning Province(2024JH3/10200050)the Natural Science Foundation of Chongqing(Grant No.CSTB2023NSCQMSX0003)the Fundamental Research Funds for the Central Universities(31920240125-06)。
文摘The advancements in the new industrial era demand higher standards for integrated intelligent sensors.These multi-parameter coupling sensors require sensing materials that can swiftly respond to various physical stimuli,including stress,temperature,humidity,etc.Mechanoluminescence(ML),with its unique mechanical–optical response,serves as an effective medium for stress sensing.In ML materials,constructing multiple luminescent centers not only enables multicolor ML but also allows for temperature sensing through the differential thermal quenching properties of various luminescent centers.In this study,we present an energy transfer strategy that leverages high-energy blue-emitting ML from the host material,combined with Tb^(3+) and Mn^(2+),to achieve multicolor ML.The mechanical response is correlated with the integrated intensity of ML,while the temperature response is governed by the dynamic ML intensity ratio of ITb/IMn.This approach simplifies the design of multifunctional sensors and facilitates remote,dual-mode sensing.Moreover,we develop a highly secure encryption system based on the integration of multicolor PL and ML with an ML-triggering mechanism that is both convenient and reliable.This work presents an effective strategy for developing multicolor ML materials and advancing multimodal sensing.
