O482.31 96032029纳米硅/非晶硅多层膜室温可见光致发光研究=Study of photoluminescence in nano-crystallinesilicon/amorphous silicon multilayers[刊,中]/佟嵩,刘湘娜,鲍希茂(南京大学物理系固体微结构物理国家实验室)//半导体学报...O482.31 96032029纳米硅/非晶硅多层膜室温可见光致发光研究=Study of photoluminescence in nano-crystallinesilicon/amorphous silicon multilayers[刊,中]/佟嵩,刘湘娜,鲍希茂(南京大学物理系固体微结构物理国家实验室)//半导体学报.-1995,16-(9). 716-720报道了在用等离子体增强化学汽相淀积法制备的氢化钠米硅(nc-Si:H)/氢化非晶硅(a-Si:H)多层膜中,未经任何后处理工艺,观察到室温可见光致发光。当nc-Si:H层厚度由4.0 nm下降至2.1展开更多
O484.4/O482.31 95021071用等离子体增强化学汽相沉积方法制备纳米晶粒硅薄膜光致发光=Photoluminescence from nano—crystallites of silicon films preparaed byPECVD[刊,中]/刘湘娜,吴晓薇,鲍希茂,何宇亮(南京大学物理系,固体微结...O484.4/O482.31 95021071用等离子体增强化学汽相沉积方法制备纳米晶粒硅薄膜光致发光=Photoluminescence from nano—crystallites of silicon films preparaed byPECVD[刊,中]/刘湘娜,吴晓薇,鲍希茂,何宇亮(南京大学物理系,固体微结构国家重点实验室)∥物理学报.—1994,43(6).—985—989报道用高氢稀释硅烷为反应气源。展开更多
In order to study the effect mechanism of N-doping on the visible-light photoactivity of TiO2,N-doped and un-doped TiO2 nano-powders were prepared by an acid-catalyzed sol-gel method and characterized by X-ray diffrac...In order to study the effect mechanism of N-doping on the visible-light photoactivity of TiO2,N-doped and un-doped TiO2 nano-powders were prepared by an acid-catalyzed sol-gel method and characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),electron spin resonance(ESR),UV-Vis diffuse reflection spectra(DRS),and photoluminescence spectra(PL)techniques.Their photoactivities are evaluated by the photocatalytic degradation of methylene blue(MB)in aqueous solution under UV light and visible-light irradiation,respectively.The results reveal that the as-prepared N-doped sample with single anatase exhibits a good visible-light photoactivity,whereas its UV photoactivity decreases slightly,compared with the un-doped sample.The N-doping increases surface hydroxyl groups and forms abundant oxygen vacancies bounding single electrons.The visible-light response of the N-doped sample can be ascribed to a synergetic effect of impurity energy levels due to the substitutional N-doping and defect energy levels owing to the formation of oxygen vacancies.The separation of the photo-generated electron and hole can be promoted by the increase in both oxygen vacancies and surface hydroxyl groups,which are conducive for enhancement of photoactivity.The increase in visible-light photoactivity of the N-doped sample is related with the decrease in its PL spectral intensity in visible-light region.展开更多
A new aqueous chemical growth method for generation of ZnO flowerlike and spindlelike nanostructures, transformed from layered basic zinc acetate （LBZA） nanobelts, is developed. The novel as-synthesized ZnO flowerli...A new aqueous chemical growth method for generation of ZnO flowerlike and spindlelike nanostructures, transformed from layered basic zinc acetate （LBZA） nanobelts, is developed. The novel as-synthesized ZnO flowerlike and spindlelike nanostructures are mainly due to the pH. They are characterized using X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The X-ray diffraction peaks indicate that these ZnO nanostructures prefer to grow along the C-axis. Photoluminescence （PL） measurements show that the ZnO flowerlike nanostructures have strong ultraviolet （UV） emission properties at 380 rim, while no defect-related visible emission can be detected. The good performance for photoluminescence emission makes the ZnO flowerlike nanostructures to be promising candidates for photonic and electronic device applications.展开更多
Lead halide perovskite nanocrystals(NCs)exhibit high photoluminescence quantum yield(PLQY),high defect tolerance,narrow half peak width,and wide luminous gamut,making them the ideal optoelectronic materials in numerou...Lead halide perovskite nanocrystals(NCs)exhibit high photoluminescence quantum yield(PLQY),high defect tolerance,narrow half peak width,and wide luminous gamut,making them the ideal optoelectronic materials in numerous fields.Nonetheless,their production still suffers from the limited productivity at the bench level.In this work,we fabricated CsPbX3(X=Cl,Br,I)NCs within droplet-based micro-reactors,where both the nucleation and growth processes could be precisely controlled inside 130-nL microdroplets.This provides a new paradigm for the large-scale synthesis of perovskite NCs with high PLQY.Compared with other synthetic methods,this method can increase the concentration of reactant precursors by 3±116 times,while lowering the ligand to reactant ratio to 2%±50%of the commonly used hot-injection method.By modulating the reaction temperature and residence time,the structure-function relationship between the morphology of NCs and PL properties was extensively investigated.The microfluidic-based process allows the flexible adjustment in the proportion of PbX2 precursors to achieve the fabrication of perovskite NCs whose luminescence range covers the entire visible spectrum(406±677 nm)within one reaction.Finally,perovskite NCs with different halide ions were encapsulated in polymethyl methacrylate to prepare a colored light-emitting diode strip.展开更多
文摘O482.31 96032029纳米硅/非晶硅多层膜室温可见光致发光研究=Study of photoluminescence in nano-crystallinesilicon/amorphous silicon multilayers[刊,中]/佟嵩,刘湘娜,鲍希茂(南京大学物理系固体微结构物理国家实验室)//半导体学报.-1995,16-(9). 716-720报道了在用等离子体增强化学汽相淀积法制备的氢化钠米硅(nc-Si:H)/氢化非晶硅(a-Si:H)多层膜中,未经任何后处理工艺,观察到室温可见光致发光。当nc-Si:H层厚度由4.0 nm下降至2.1
文摘O484.4/O482.31 95021071用等离子体增强化学汽相沉积方法制备纳米晶粒硅薄膜光致发光=Photoluminescence from nano—crystallites of silicon films preparaed byPECVD[刊,中]/刘湘娜,吴晓薇,鲍希茂,何宇亮(南京大学物理系,固体微结构国家重点实验室)∥物理学报.—1994,43(6).—985—989报道用高氢稀释硅烷为反应气源。
基金Research Foundation for Young Academic Core of Harbin Normal University,China(No.08XBSK89)Science and Technology Research Program of Education Bureau of Heilongjiang Province of China(No.11551115)
文摘In order to study the effect mechanism of N-doping on the visible-light photoactivity of TiO2,N-doped and un-doped TiO2 nano-powders were prepared by an acid-catalyzed sol-gel method and characterized by X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),electron spin resonance(ESR),UV-Vis diffuse reflection spectra(DRS),and photoluminescence spectra(PL)techniques.Their photoactivities are evaluated by the photocatalytic degradation of methylene blue(MB)in aqueous solution under UV light and visible-light irradiation,respectively.The results reveal that the as-prepared N-doped sample with single anatase exhibits a good visible-light photoactivity,whereas its UV photoactivity decreases slightly,compared with the un-doped sample.The N-doping increases surface hydroxyl groups and forms abundant oxygen vacancies bounding single electrons.The visible-light response of the N-doped sample can be ascribed to a synergetic effect of impurity energy levels due to the substitutional N-doping and defect energy levels owing to the formation of oxygen vacancies.The separation of the photo-generated electron and hole can be promoted by the increase in both oxygen vacancies and surface hydroxyl groups,which are conducive for enhancement of photoactivity.The increase in visible-light photoactivity of the N-doped sample is related with the decrease in its PL spectral intensity in visible-light region.
基金supported by the National High Technology Research and Development Program of China (Nos.2007AA030112 and2009AA032708)
文摘A new aqueous chemical growth method for generation of ZnO flowerlike and spindlelike nanostructures, transformed from layered basic zinc acetate （LBZA） nanobelts, is developed. The novel as-synthesized ZnO flowerlike and spindlelike nanostructures are mainly due to the pH. They are characterized using X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The X-ray diffraction peaks indicate that these ZnO nanostructures prefer to grow along the C-axis. Photoluminescence （PL） measurements show that the ZnO flowerlike nanostructures have strong ultraviolet （UV） emission properties at 380 rim, while no defect-related visible emission can be detected. The good performance for photoluminescence emission makes the ZnO flowerlike nanostructures to be promising candidates for photonic and electronic device applications.
基金financially supported by the National Natural Science Foundation of China (22025801, 21991101, and 21736006)。
文摘Lead halide perovskite nanocrystals(NCs)exhibit high photoluminescence quantum yield(PLQY),high defect tolerance,narrow half peak width,and wide luminous gamut,making them the ideal optoelectronic materials in numerous fields.Nonetheless,their production still suffers from the limited productivity at the bench level.In this work,we fabricated CsPbX3(X=Cl,Br,I)NCs within droplet-based micro-reactors,where both the nucleation and growth processes could be precisely controlled inside 130-nL microdroplets.This provides a new paradigm for the large-scale synthesis of perovskite NCs with high PLQY.Compared with other synthetic methods,this method can increase the concentration of reactant precursors by 3±116 times,while lowering the ligand to reactant ratio to 2%±50%of the commonly used hot-injection method.By modulating the reaction temperature and residence time,the structure-function relationship between the morphology of NCs and PL properties was extensively investigated.The microfluidic-based process allows the flexible adjustment in the proportion of PbX2 precursors to achieve the fabrication of perovskite NCs whose luminescence range covers the entire visible spectrum(406±677 nm)within one reaction.Finally,perovskite NCs with different halide ions were encapsulated in polymethyl methacrylate to prepare a colored light-emitting diode strip.
