Photoelectron is the foundation of latent image formation, the decay process of photoelectrons is influenced by all kinds of trapping centres in silver halide. By analysing the mechanism of latent image formation it i...Photoelectron is the foundation of latent image formation, the decay process of photoelectrons is influenced by all kinds of trapping centres in silver halide. By analysing the mechanism of latent image formation it is found that electron trap, hole trap, and one kind of recombination centre where free electron and trapped hole recombine are the main trapping centres in silver halide. Different trapping centres have different influences on the photoelectron behaviour. The effects of all kinds of typical trapping centres on the decay of photoelectrons are systematically investigated by solving the photoelectron decay kinetic equations. The results are in agreement with those obtained in the microwave absorption dielectric spectrum experiment.展开更多
Organic-inorganic hybrid silver halides have emerged as promising materials for optoelectronic devices due to their unique photoluminescence(PL)properties,excellent stability,and environmental benignity.However,their ...Organic-inorganic hybrid silver halides have emerged as promising materials for optoelectronic devices due to their unique photoluminescence(PL)properties,excellent stability,and environmental benignity.However,their PL efficiency remains limited by weak Ag^(+)-centered radiative recombination and significant non-radiative losses.Herein,we report on a facile hydrogen-to-fluorine(H/F)substitution strategy to enhance luminescent performance in hybrid silver halides by strengthening argentophilic interactions.Using tetraethylammonium(TEA^(+))and its fluorinated analogue triethyl(2-fluoroethyl)ammonium(FTEA^(+)),we synthesized two isostructural one-dimensional silver bromide hybrids:(TEA)Ag_(2)Br_(3) and(FTEA)Ag_(2)Br_(3).The fluorinated compound exhibits a broadband yellow-white emission with a PL quantum yield(PLQY)of 11.9%,markedly higher than the<1%PLQY of weak blue light emission for its non-fluorinated counterpart.Density functional theory calculations reveal that enhanced metal-to-metal charge transfer(MMCT)and halide-to-metal charge transfer(XMCT)processes,promoted by reduced Ag···Ag distances via F···Br interactions,are responsible for the improved PL properties.This substitution strategy was further validated in silver iodide systems,confirming its general applicability.Moreover,the excellent thermal stability and broad emission profile of(FTEA)Ag_(2)Br_(3) enable its integration into white light-emitting diodes,achieving a high color rendering index of 82.7.These observations provide a new avenue for rational design of high-performance Ag-based hybrid luminescent materials.展开更多
Silver halide (AgX) microcrystal was used as template to synthesize hollow polyelectrolyte capsules. These hollow capsules were characterized by laser light scattering (LLS) used to measure the size of the capsules in...Silver halide (AgX) microcrystal was used as template to synthesize hollow polyelectrolyte capsules. These hollow capsules were characterized by laser light scattering (LLS) used to measure the size of the capsules in solution. The ratio of hydrodynamic radius (R h ) from dynamic LLS to the radius of gyration (Rg) from static LLS is almost unity, revealing that the entities are hollow in solution. The results suggest that the LLS method can be regarded as a good complement to the confocal laser scanning microscopy (CLSM) method for the characterization of small hollow capsules, and it possesses the advantage of not needing fluorescence labeling.展开更多
The article is devoted to the technology for obtaining optical ceramics of Ag Br-Tl I and Ag Br-Tl Br_(0.46)I_(0.54) systems and manufacturing samples with different compositions.The new heterophase crystal ceramics a...The article is devoted to the technology for obtaining optical ceramics of Ag Br-Tl I and Ag Br-Tl Br_(0.46)I_(0.54) systems and manufacturing samples with different compositions.The new heterophase crystal ceramics are transparent without absorption windows in the spectral range from 1.0 to 60.0μm.In the ceramics’transparency spectra based on the Ag Br-Tl I and Ag Br-Tl Br_(0.46)I_(0.54) systems fusibility diagrams,with an increase in the thallium halides mass fraction,as well as the replacement of the bromine ion with iodine,the maximum transparency shifts to a long infrared region.展开更多
基金Project supported by the National Natural Science Foundation of China （Grant Nos 10274017 and 10354001）, and the Natural Science Foundation of Hebei Province, China （Grant Nos 103097 and 603138）.
文摘Photoelectron is the foundation of latent image formation, the decay process of photoelectrons is influenced by all kinds of trapping centres in silver halide. By analysing the mechanism of latent image formation it is found that electron trap, hole trap, and one kind of recombination centre where free electron and trapped hole recombine are the main trapping centres in silver halide. Different trapping centres have different influences on the photoelectron behaviour. The effects of all kinds of typical trapping centres on the decay of photoelectrons are systematically investigated by solving the photoelectron decay kinetic equations. The results are in agreement with those obtained in the microwave absorption dielectric spectrum experiment.
基金support from the Joint Funds of the National Natural Science Foundation of China(U24A20506)the National Natural Science Foundation of China(22271211)+1 种基金the 1331 Project of Shanxi Provincethe Natural Science Foundation of Shanxi Normal University.
文摘Organic-inorganic hybrid silver halides have emerged as promising materials for optoelectronic devices due to their unique photoluminescence(PL)properties,excellent stability,and environmental benignity.However,their PL efficiency remains limited by weak Ag^(+)-centered radiative recombination and significant non-radiative losses.Herein,we report on a facile hydrogen-to-fluorine(H/F)substitution strategy to enhance luminescent performance in hybrid silver halides by strengthening argentophilic interactions.Using tetraethylammonium(TEA^(+))and its fluorinated analogue triethyl(2-fluoroethyl)ammonium(FTEA^(+)),we synthesized two isostructural one-dimensional silver bromide hybrids:(TEA)Ag_(2)Br_(3) and(FTEA)Ag_(2)Br_(3).The fluorinated compound exhibits a broadband yellow-white emission with a PL quantum yield(PLQY)of 11.9%,markedly higher than the<1%PLQY of weak blue light emission for its non-fluorinated counterpart.Density functional theory calculations reveal that enhanced metal-to-metal charge transfer(MMCT)and halide-to-metal charge transfer(XMCT)processes,promoted by reduced Ag···Ag distances via F···Br interactions,are responsible for the improved PL properties.This substitution strategy was further validated in silver iodide systems,confirming its general applicability.Moreover,the excellent thermal stability and broad emission profile of(FTEA)Ag_(2)Br_(3) enable its integration into white light-emitting diodes,achieving a high color rendering index of 82.7.These observations provide a new avenue for rational design of high-performance Ag-based hybrid luminescent materials.
基金This work was supported by the National Natural Science Foundation of China (Grant No. 20204017 and 50373049) and theChinese Academy of Sciences (CMS-CX200308).
文摘Silver halide (AgX) microcrystal was used as template to synthesize hollow polyelectrolyte capsules. These hollow capsules were characterized by laser light scattering (LLS) used to measure the size of the capsules in solution. The ratio of hydrodynamic radius (R h ) from dynamic LLS to the radius of gyration (Rg) from static LLS is almost unity, revealing that the entities are hollow in solution. The results suggest that the LLS method can be regarded as a good complement to the confocal laser scanning microscopy (CLSM) method for the characterization of small hollow capsules, and it possesses the advantage of not needing fluorescence labeling.
基金supported by the Russian Science Foundation(No.18-73-10063)。
文摘The article is devoted to the technology for obtaining optical ceramics of Ag Br-Tl I and Ag Br-Tl Br_(0.46)I_(0.54) systems and manufacturing samples with different compositions.The new heterophase crystal ceramics are transparent without absorption windows in the spectral range from 1.0 to 60.0μm.In the ceramics’transparency spectra based on the Ag Br-Tl I and Ag Br-Tl Br_(0.46)I_(0.54) systems fusibility diagrams,with an increase in the thallium halides mass fraction,as well as the replacement of the bromine ion with iodine,the maximum transparency shifts to a long infrared region.
