Purely organic room-temperature phosphorescence(RTP)is current hotspot in the research fields of chemistry,biology,materials etc.Herein,we report that photo-thermal double response reversible ultralong RTP flexible el...Purely organic room-temperature phosphorescence(RTP)is current hotspot in the research fields of chemistry,biology,materials etc.Herein,we report that photo-thermal double response reversible ultralong RTP flexible elastic material with multicolor delayed fluorescence,which is constructed by 4-biphenylboronic acid(BOH),polyethylene glycol,2,2-bis(hydroxymethyl)propionic acid,isophorone diamine and isophorone diisocyanate copolymer.Importantly,the supramolecular phosphorescent elastomer not only exhibits extending RTP emission with a lifetime up to 1.21 s,but also gives a visible afterglow of 20 s via encapsulation of BOH unities by the deep cavities of hydroxypropyl-β-cyclodextrin(β-CD-HP)and in situ polymerization.Especially,after doping organic dyes(Fluorescein isothiocyanate,Sulforhodamine 101,Rhodamine B),supramolecular phosphorescent elastomer achieves multicolor delayed fluorescence realized by RTP energy transfer from phosphorescent donor to dye acceptors,which possesses reversible photo-thermal responsiveness and maintains high efficiency in delayed emission even after dozens of cycles.Present research provides a new approach for constructing multicolor delayed fluorescent supramolecular elastomers.展开更多
Pure organic materials with ultralong room-temperature phosphorescence(RTP)and persistent luminescence in broad color gamut exhibit tremendous potential and broad application prospects due to their unique optical prop...Pure organic materials with ultralong room-temperature phosphorescence(RTP)and persistent luminescence in broad color gamut exhibit tremendous potential and broad application prospects due to their unique optical properties.This article proposes a simple strategy,polyatomic synergistic effect,to endow persistent luminescent materials with ultralong lifetime and broad color-tunability through polyatomic synergistic effect and non-traditional phosphorescence resonance energy transfer(PRET).By leveraging the polyatomic synergistic effect to enhance the intersystem crossing(ISC)in bibenzimidazole(BBI)derivatives and suppress the non-radiative transition process,ultralong persistent room-temperature phosphorescence has been successfully achieved after incorporating BBI-Cl-M into poly(methyl methacrylate)(PMMA)to form a rigid matrix(BBI-Cl-M@PMMA).Specifically,the ester functionalized bibenzimidazole with modified chlorine on molecular skeleton(BBI-Cl-M)demonstrates a remarkable phosphorescent lifetime(τp)of up to 256.4 ms.In addition,the behaviors and mechanism of RTP via polyatomic synergistic effect have been further understood by theoretical calculation and single crystal analysis.Subsequently,utilizing BBI-Cl-M as the energy donor and Rhodamine B(RB)as the energy acceptor,persistent and multicolor organic afterglow covering from green to red has been realized successfully by simply regulating the doping composition and concentration of PRET systems.These RTP materials have also been applied in underwater afterglow emission and multilevel anti-counterfeiting technology successfully.展开更多
Herein,a ternary supramolecular assembly(BPP-BQ?CB[8]-SCD)is successfully constructed by a bromophenylpyridine-tethered-bromoisoquinoline(BPP-BQ),cucurbit[8]uril(CB[8])and sulfonatedβ-cyclodextrin(SCD)via successive ...Herein,a ternary supramolecular assembly(BPP-BQ?CB[8]-SCD)is successfully constructed by a bromophenylpyridine-tethered-bromoisoquinoline(BPP-BQ),cucurbit[8]uril(CB[8])and sulfonatedβ-cyclodextrin(SCD)via successive assembling way,exhibiting progressively enhanced green roomtemperature phosphorescence(RTP).The self-aggregates of BPP-BQ?CB[8]-SCD accommodate an energy acceptor rhodamine B(Rh B)to form a light-harvesting system(BPP-BQ?CB[8]-SCD@Rh B)with further enhanced yellow long-lifetime luminescence with large Stokes shift based on triplet-singlet F?rster resonance energy transfer(TS-FRET).Crucially,the introduction of a photoactive diarylethene achieves the long-lived photoluminescence of BPP-BQ?CB[8]-SCD@Rh B to be switched with the efficiency of up to98%through logically ordered lowering/enhancing RTP performance of the energy donor and intercepting/restoring TS-FRET pathway,when stimulated by host-vip competition and light illumination in sequence.Moreover,BPP-BQ?CB[8]-SCD@Rh B is evenly doped into polyvinyl alcohol or polyacrylamide to obtain high-performance luminescent films with long afterglow.The abovementioned logically ordered stimulus-switched long-lived emission enables the light-harvesting system in both solution and solid state to be applied in high-security-level information encryption and transformation,and anticounterfeiting.展开更多
Room-temperature phosphorescence(RTP)materials exhibiting long emission lifetimes have gained increasing attention owing to their potential applications in encryption,anti-counterfeiting,and sensing.However,most polym...Room-temperature phosphorescence(RTP)materials exhibiting long emission lifetimes have gained increasing attention owing to their potential applications in encryption,anti-counterfeiting,and sensing.However,most polymers exhibit a short RTP lifetime(<1 s)because of their unstable triplet excitons.Herein,a new strategy of polymer chain stabilized phosphorescence(PCSP),which yields a new kind of RTP polymers with an ultralong lifetime and a sensitive oxygen response,has been reported.The rigid polymer chains of poly(methyl mathacrylate)(PMMA)immobilize the emitter molecules through multiple interactions between them,giving rise to efficient RTP.Meanwhile,the loosely-packed amorphous polymer chains allow oxygen to diffuse inside,endowing the doped polymers with oxygen sensitivity.Flexible and transparent polymer films exhibited an impressive ultralong RTP lifetime of 2.57 s at room temperature in vacuum,which was among the best performance of PMMA.Intriguingly,their RTP was rapidly quenched in the presence of oxygen.Furthermore,RTP microparticles with a diameter of 1.63μm were synthesized using in situ dispersion polymerization technique.Finally,oxygen sensors for quick,visual,and quantitative oxygen detection were developed based on the RTP microparticles through phosphorescence lifetime and image analysis.With distinctive advantages such as an ultralong lifetime,oxygen sensitivity,ease of fabrication,and cost-effectiveness,PCSP opens a new avenue to sensitive materials for oxygen detection.展开更多
本文以IP网络中网络层与传输层的检错和纠错机制为切入点,比较了各类纠错机制的特点。通过阐述前向纠错的基本原理,介绍了SMPTE ST 2022-5标准中前向纠错的具体实现方式和由此给用户带来的延迟问题,列举了前向纠错机制的局限以及克服这...本文以IP网络中网络层与传输层的检错和纠错机制为切入点,比较了各类纠错机制的特点。通过阐述前向纠错的基本原理,介绍了SMPTE ST 2022-5标准中前向纠错的具体实现方式和由此给用户带来的延迟问题,列举了前向纠错机制的局限以及克服这些问题的方法。展开更多
针对某铁路局应急通信系统转发视频流至国铁集团应急通信系统时出现视频卡顿的问题,利用数据网业务质量智能感知系统对应急通信视频业务进行监控分析,确定视频卡顿原因,提出采用RTP+实时传输控制协议(Real-Time Control Protocol,RTCP)...针对某铁路局应急通信系统转发视频流至国铁集团应急通信系统时出现视频卡顿的问题,利用数据网业务质量智能感知系统对应急通信视频业务进行监控分析,确定视频卡顿原因,提出采用RTP+实时传输控制协议(Real-Time Control Protocol,RTCP)传输UDP数据包以保证视频流数据传输可靠有序的解决方案。展开更多
随着4K、8K超高清电视的不断发展,传统的SDI技术架构在大数据量、系统灵活性等方面落后,基于互联网的IP技术具有大带宽、数据交换方式灵活、兼容性强等特点,为电视系统的设计提供了新的思路。本文对基于IP网络的传输标准SMPTE ST 2110...随着4K、8K超高清电视的不断发展,传统的SDI技术架构在大数据量、系统灵活性等方面落后,基于互联网的IP技术具有大带宽、数据交换方式灵活、兼容性强等特点,为电视系统的设计提供了新的思路。本文对基于IP网络的传输标准SMPTE ST 2110进行分析,从而引出对未来电视系统架构的更加深层次的思考。展开更多
随着4K、8K超高清技术、互联网技术、融合媒体与云技术的不断发展及应用,传统的SDI技术架构在带宽、互联网应用、灵活配置性等方面越来越落后,而面向互联网的IP技术和云技术以海量的带宽、灵活的数据交换方式与多样的兼容性为电视系统...随着4K、8K超高清技术、互联网技术、融合媒体与云技术的不断发展及应用,传统的SDI技术架构在带宽、互联网应用、灵活配置性等方面越来越落后,而面向互联网的IP技术和云技术以海量的带宽、灵活的数据交换方式与多样的兼容性为电视系统的架构提供了新的思路。本文对基于IP网络的传输标准SMPTE ST 2110进行分析,从而引出对未来电视系统架构的更加深层次的思考。展开更多
针对集中式基于网际互连协议的语音传输(Voice over Internet Protocol,VoIP)语音通信交换系统(Voice Communication Switching System,VCCS)的互操作性需求,提出一种基于VoIP技术的中继通信解决方案。在集中式VoIP通信架构的基础上构...针对集中式基于网际互连协议的语音传输(Voice over Internet Protocol,VoIP)语音通信交换系统(Voice Communication Switching System,VCCS)的互操作性需求,提出一种基于VoIP技术的中继通信解决方案。在集中式VoIP通信架构的基础上构建中继通信模型,结合局向管理、冠号管理、路由管理以及会议管理等模块的协同运行给出VoIP中继通信的业务处理流程,并详细阐述中继会议的核心模块。最后,通过两种异型语音通信交换系统的中继通信对比测试,验证了文章提出的VoIP中继通信方法的可靠性和互操作性。展开更多
基金financially supported by the National Natural Science Foundation of China(No.22131008)。
文摘Purely organic room-temperature phosphorescence(RTP)is current hotspot in the research fields of chemistry,biology,materials etc.Herein,we report that photo-thermal double response reversible ultralong RTP flexible elastic material with multicolor delayed fluorescence,which is constructed by 4-biphenylboronic acid(BOH),polyethylene glycol,2,2-bis(hydroxymethyl)propionic acid,isophorone diamine and isophorone diisocyanate copolymer.Importantly,the supramolecular phosphorescent elastomer not only exhibits extending RTP emission with a lifetime up to 1.21 s,but also gives a visible afterglow of 20 s via encapsulation of BOH unities by the deep cavities of hydroxypropyl-β-cyclodextrin(β-CD-HP)and in situ polymerization.Especially,after doping organic dyes(Fluorescein isothiocyanate,Sulforhodamine 101,Rhodamine B),supramolecular phosphorescent elastomer achieves multicolor delayed fluorescence realized by RTP energy transfer from phosphorescent donor to dye acceptors,which possesses reversible photo-thermal responsiveness and maintains high efficiency in delayed emission even after dozens of cycles.Present research provides a new approach for constructing multicolor delayed fluorescent supramolecular elastomers.
基金supported by the National Natural Science Foundation of China(NSFC,Nos.22061039,22165027)the Top Leading Talents Project of Gansu Province,the Key R&D program of Gansu Province(No.21YF5GA066)+1 种基金Gansu Province College Industry Support Plan Project(No.2022CYZC-18)Northwest Normal University 2023 graduate research funding project(No.2023KYZZS154)。
文摘Pure organic materials with ultralong room-temperature phosphorescence(RTP)and persistent luminescence in broad color gamut exhibit tremendous potential and broad application prospects due to their unique optical properties.This article proposes a simple strategy,polyatomic synergistic effect,to endow persistent luminescent materials with ultralong lifetime and broad color-tunability through polyatomic synergistic effect and non-traditional phosphorescence resonance energy transfer(PRET).By leveraging the polyatomic synergistic effect to enhance the intersystem crossing(ISC)in bibenzimidazole(BBI)derivatives and suppress the non-radiative transition process,ultralong persistent room-temperature phosphorescence has been successfully achieved after incorporating BBI-Cl-M into poly(methyl methacrylate)(PMMA)to form a rigid matrix(BBI-Cl-M@PMMA).Specifically,the ester functionalized bibenzimidazole with modified chlorine on molecular skeleton(BBI-Cl-M)demonstrates a remarkable phosphorescent lifetime(τp)of up to 256.4 ms.In addition,the behaviors and mechanism of RTP via polyatomic synergistic effect have been further understood by theoretical calculation and single crystal analysis.Subsequently,utilizing BBI-Cl-M as the energy donor and Rhodamine B(RB)as the energy acceptor,persistent and multicolor organic afterglow covering from green to red has been realized successfully by simply regulating the doping composition and concentration of PRET systems.These RTP materials have also been applied in underwater afterglow emission and multilevel anti-counterfeiting technology successfully.
基金the National Natural Science Foundation of China(Nos.21801063,22305070 and U20041101)the Top-Notch Talents Program of Henan Agricultural University(Nos.30501049 and 30501032)for financial support。
文摘Herein,a ternary supramolecular assembly(BPP-BQ?CB[8]-SCD)is successfully constructed by a bromophenylpyridine-tethered-bromoisoquinoline(BPP-BQ),cucurbit[8]uril(CB[8])and sulfonatedβ-cyclodextrin(SCD)via successive assembling way,exhibiting progressively enhanced green roomtemperature phosphorescence(RTP).The self-aggregates of BPP-BQ?CB[8]-SCD accommodate an energy acceptor rhodamine B(Rh B)to form a light-harvesting system(BPP-BQ?CB[8]-SCD@Rh B)with further enhanced yellow long-lifetime luminescence with large Stokes shift based on triplet-singlet F?rster resonance energy transfer(TS-FRET).Crucially,the introduction of a photoactive diarylethene achieves the long-lived photoluminescence of BPP-BQ?CB[8]-SCD@Rh B to be switched with the efficiency of up to98%through logically ordered lowering/enhancing RTP performance of the energy donor and intercepting/restoring TS-FRET pathway,when stimulated by host-vip competition and light illumination in sequence.Moreover,BPP-BQ?CB[8]-SCD@Rh B is evenly doped into polyvinyl alcohol or polyacrylamide to obtain high-performance luminescent films with long afterglow.The abovementioned logically ordered stimulus-switched long-lived emission enables the light-harvesting system in both solution and solid state to be applied in high-security-level information encryption and transformation,and anticounterfeiting.
基金National Natural Science Foundation of China(No.22475241)Guangdong Basic and Applied Basic Research Foundation(Nos.2022A1515010826 and 2023A1515012696)the Fundamental Research Funds for the Central Universities(Nos.17lgjc03 and 18lgpy04).
文摘Room-temperature phosphorescence(RTP)materials exhibiting long emission lifetimes have gained increasing attention owing to their potential applications in encryption,anti-counterfeiting,and sensing.However,most polymers exhibit a short RTP lifetime(<1 s)because of their unstable triplet excitons.Herein,a new strategy of polymer chain stabilized phosphorescence(PCSP),which yields a new kind of RTP polymers with an ultralong lifetime and a sensitive oxygen response,has been reported.The rigid polymer chains of poly(methyl mathacrylate)(PMMA)immobilize the emitter molecules through multiple interactions between them,giving rise to efficient RTP.Meanwhile,the loosely-packed amorphous polymer chains allow oxygen to diffuse inside,endowing the doped polymers with oxygen sensitivity.Flexible and transparent polymer films exhibited an impressive ultralong RTP lifetime of 2.57 s at room temperature in vacuum,which was among the best performance of PMMA.Intriguingly,their RTP was rapidly quenched in the presence of oxygen.Furthermore,RTP microparticles with a diameter of 1.63μm were synthesized using in situ dispersion polymerization technique.Finally,oxygen sensors for quick,visual,and quantitative oxygen detection were developed based on the RTP microparticles through phosphorescence lifetime and image analysis.With distinctive advantages such as an ultralong lifetime,oxygen sensitivity,ease of fabrication,and cost-effectiveness,PCSP opens a new avenue to sensitive materials for oxygen detection.
文摘针对某铁路局应急通信系统转发视频流至国铁集团应急通信系统时出现视频卡顿的问题,利用数据网业务质量智能感知系统对应急通信视频业务进行监控分析,确定视频卡顿原因,提出采用RTP+实时传输控制协议(Real-Time Control Protocol,RTCP)传输UDP数据包以保证视频流数据传输可靠有序的解决方案。
文摘随着4K、8K超高清电视的不断发展,传统的SDI技术架构在大数据量、系统灵活性等方面落后,基于互联网的IP技术具有大带宽、数据交换方式灵活、兼容性强等特点,为电视系统的设计提供了新的思路。本文对基于IP网络的传输标准SMPTE ST 2110进行分析,从而引出对未来电视系统架构的更加深层次的思考。
文摘随着4K、8K超高清技术、互联网技术、融合媒体与云技术的不断发展及应用,传统的SDI技术架构在带宽、互联网应用、灵活配置性等方面越来越落后,而面向互联网的IP技术和云技术以海量的带宽、灵活的数据交换方式与多样的兼容性为电视系统的架构提供了新的思路。本文对基于IP网络的传输标准SMPTE ST 2110进行分析,从而引出对未来电视系统架构的更加深层次的思考。
文摘针对集中式基于网际互连协议的语音传输(Voice over Internet Protocol,VoIP)语音通信交换系统(Voice Communication Switching System,VCCS)的互操作性需求,提出一种基于VoIP技术的中继通信解决方案。在集中式VoIP通信架构的基础上构建中继通信模型,结合局向管理、冠号管理、路由管理以及会议管理等模块的协同运行给出VoIP中继通信的业务处理流程,并详细阐述中继会议的核心模块。最后,通过两种异型语音通信交换系统的中继通信对比测试,验证了文章提出的VoIP中继通信方法的可靠性和互操作性。
