Stimuli-responsive circularly polarized luminescence(CPL)materials have received extensive attention in the field of information encryption and anti-counterfeiting due to their ability to intelligently respond to exte...Stimuli-responsive circularly polarized luminescence(CPL)materials have received extensive attention in the field of information encryption and anti-counterfeiting due to their ability to intelligently respond to external stimuli,enabling dynamic modulation of CPL properties.In this work,chiral luminescent R/S-CsPbBr_(3)nanoparticles(NPs)are employed to induce CPL in achiral host lanthanide metal-organic frameworks(Ln-MOFs),thereby achieving the high-performance optical stimuli-responsive CPL.This synthetic strategy demonstrates considerable universality and significantly expands the CPL spectral coverage through rational modulation of Ln-MOFs.The resulting R/S-CsPbBr_(3)@Eu-MOF composite materials exhibit excellent CPL performance with a luminescence dissymmetry factor(g_(lum))as high as 1.3×10^(-2),attributed to synergistic energy/charge transfer processes mediated byπ-πstacking interactions between the host Eu-MOFs and vip R/S-CsPbBr_(3).The R/S-CsPbBr_(3)@LnMOF composite materials feature two distinct chiral emission centers,allowing wavelength-programmable CPL emission under different excitation wavelengths.This property holds significant potential for applications in multilevel information encryption and anti-counterfeiting.展开更多
The rapid development of artificial intelligence poses an urgent need for low-energy-consumption and small-sized artificial photonic synapses.Here,it is pretty novel to demonstrate a light-stimulated synaptic device b...The rapid development of artificial intelligence poses an urgent need for low-energy-consumption and small-sized artificial photonic synapses.Here,it is pretty novel to demonstrate a light-stimulated synaptic device based on a single(Al,Ga)N nanowire successfully.Thanks to the presence of vacancy defects in the single nanowire,the artificial synaptic device can simulate multiple functions of biological synapses under stimulation of both 310 and 365 nm light photons,including paired-pulse facilitation,spike timing dependent plasticity,and memory learning capabilities.The energy consumption of artificial synaptic device can be reduced as little as 5.58×10^(-13) J,which is close to that of the biological synapse in human brain.Furthermore,the synaptic device is demonstrated to have the high stability for both long-time stimulation and long-time storage.Based on the experimental conductance of long-term potentiation and long-term depression,the simulated three-layer neural network can achieve a high recognition rate of 92%after only 10 training epochs.With a brain-like behavior,the single-nanowire-based synaptic devices can promote the development of visual neuromorphic computing technology and artificial intelligence systems requiring ultralow energy consumption.展开更多
基金supported financially by the National Natural Science Foundation of China(Grant no.22475025)the Ministry of Science and Technology of China(Grant no.2022YFA1204403)the Chinese Academy of Sciences(XDB0520203).
文摘Stimuli-responsive circularly polarized luminescence(CPL)materials have received extensive attention in the field of information encryption and anti-counterfeiting due to their ability to intelligently respond to external stimuli,enabling dynamic modulation of CPL properties.In this work,chiral luminescent R/S-CsPbBr_(3)nanoparticles(NPs)are employed to induce CPL in achiral host lanthanide metal-organic frameworks(Ln-MOFs),thereby achieving the high-performance optical stimuli-responsive CPL.This synthetic strategy demonstrates considerable universality and significantly expands the CPL spectral coverage through rational modulation of Ln-MOFs.The resulting R/S-CsPbBr_(3)@Eu-MOF composite materials exhibit excellent CPL performance with a luminescence dissymmetry factor(g_(lum))as high as 1.3×10^(-2),attributed to synergistic energy/charge transfer processes mediated byπ-πstacking interactions between the host Eu-MOFs and vip R/S-CsPbBr_(3).The R/S-CsPbBr_(3)@LnMOF composite materials feature two distinct chiral emission centers,allowing wavelength-programmable CPL emission under different excitation wavelengths.This property holds significant potential for applications in multilevel information encryption and anti-counterfeiting.
基金The authors are grateful for the Key Research Program of Frontier Sciences,CAS(No.ZDBS-LY-JSC034)the Research Program of Scientific Instrument and Equipment of CAS(No.YJKYYQ20200073)+1 种基金the National Natural Science Foundation of China(No.62174172)The authors are thankful for the technical support from the Vacuum Interconnected Nanotech Workstation(Nano-X,No.F2309),Platform for Characterization&Test of SINANO,CAS.
文摘The rapid development of artificial intelligence poses an urgent need for low-energy-consumption and small-sized artificial photonic synapses.Here,it is pretty novel to demonstrate a light-stimulated synaptic device based on a single(Al,Ga)N nanowire successfully.Thanks to the presence of vacancy defects in the single nanowire,the artificial synaptic device can simulate multiple functions of biological synapses under stimulation of both 310 and 365 nm light photons,including paired-pulse facilitation,spike timing dependent plasticity,and memory learning capabilities.The energy consumption of artificial synaptic device can be reduced as little as 5.58×10^(-13) J,which is close to that of the biological synapse in human brain.Furthermore,the synaptic device is demonstrated to have the high stability for both long-time stimulation and long-time storage.Based on the experimental conductance of long-term potentiation and long-term depression,the simulated three-layer neural network can achieve a high recognition rate of 92%after only 10 training epochs.With a brain-like behavior,the single-nanowire-based synaptic devices can promote the development of visual neuromorphic computing technology and artificial intelligence systems requiring ultralow energy consumption.
