Sm^(3+)-doped materials exhibit red and orange emissions in the visible light region,showing broad applica⁃tion prospects in both laser and display material fields.However,the inherent small emission and absorption cr...Sm^(3+)-doped materials exhibit red and orange emissions in the visible light region,showing broad applica⁃tion prospects in both laser and display material fields.However,the inherent small emission and absorption cross-sections of Sm^(3+)result in low luminous efficiency,posing challenges for achieving high-quality solid-state lighting.Here,the excellent white emission of Sm^(3+)doped lithium aluminum silicate(LAS)glass was realized by introducing the Ag aggregates through Ag ion exchange.Under 395 nm excitation,the Ag-doped samples exhibit significant fluo⁃rescence enhancement with color coordinates close to the equal energy white point E(0.33,0.33)and a color ren⁃dering index(CRI)of 81.8.The study reveals that the surface plasmon resonance(SPR)effect of Ag nanoparticles enhances the luminescence of Sm^(3+),while the energy transfer mechanism between Ag^(+)and Sm^(3+)also promotes fluores⁃cence enhancement.By adjusting the concentration of AgNO_(3) and the exchange time,a series of high-quality full-spectrum white light emissions were obtained,indicating that the Ag ion-exchanged Sm^(3+)-doped LAS glass has good application potential in the development of solid-state lighting devices.Moreover,variations in the excitation wave⁃length can effectively tune the emission color,further demonstrating the tunability and practicality of this material in optoelectronic applications.展开更多
食品重金属污染日趋严重,为了证明LIBS快速检测大米中重金属元素含量的可行性,采用LIBS技术对经实验室含Cd溶液浸泡过的大米中Cd元素进行分析。首先采用LIBS和AAS技术,获取5个浓度系列的大米中Cd元素的LIBS光谱及真实浓度信息,再采用一...食品重金属污染日趋严重,为了证明LIBS快速检测大米中重金属元素含量的可行性,采用LIBS技术对经实验室含Cd溶液浸泡过的大米中Cd元素进行分析。首先采用LIBS和AAS技术,获取5个浓度系列的大米中Cd元素的LIBS光谱及真实浓度信息,再采用一元一次和一元二次定标分析模型,对Cd元素的特征光谱Cd II 214.4、Cd II226.5和Cd I 228.8进行定量分析。结果表明,原子谱线Cd I 228.8具有较高的线性相关性,并且一元二次回归模型具有较好的预测精度。试验结果表明,LIBS技术用于大米中重金属Cd元素的快速检测在理论和实践上具有可行性。展开更多
文摘Sm^(3+)-doped materials exhibit red and orange emissions in the visible light region,showing broad applica⁃tion prospects in both laser and display material fields.However,the inherent small emission and absorption cross-sections of Sm^(3+)result in low luminous efficiency,posing challenges for achieving high-quality solid-state lighting.Here,the excellent white emission of Sm^(3+)doped lithium aluminum silicate(LAS)glass was realized by introducing the Ag aggregates through Ag ion exchange.Under 395 nm excitation,the Ag-doped samples exhibit significant fluo⁃rescence enhancement with color coordinates close to the equal energy white point E(0.33,0.33)and a color ren⁃dering index(CRI)of 81.8.The study reveals that the surface plasmon resonance(SPR)effect of Ag nanoparticles enhances the luminescence of Sm^(3+),while the energy transfer mechanism between Ag^(+)and Sm^(3+)also promotes fluores⁃cence enhancement.By adjusting the concentration of AgNO_(3) and the exchange time,a series of high-quality full-spectrum white light emissions were obtained,indicating that the Ag ion-exchanged Sm^(3+)-doped LAS glass has good application potential in the development of solid-state lighting devices.Moreover,variations in the excitation wave⁃length can effectively tune the emission color,further demonstrating the tunability and practicality of this material in optoelectronic applications.
文摘食品重金属污染日趋严重,为了证明LIBS快速检测大米中重金属元素含量的可行性,采用LIBS技术对经实验室含Cd溶液浸泡过的大米中Cd元素进行分析。首先采用LIBS和AAS技术,获取5个浓度系列的大米中Cd元素的LIBS光谱及真实浓度信息,再采用一元一次和一元二次定标分析模型,对Cd元素的特征光谱Cd II 214.4、Cd II226.5和Cd I 228.8进行定量分析。结果表明,原子谱线Cd I 228.8具有较高的线性相关性,并且一元二次回归模型具有较好的预测精度。试验结果表明,LIBS技术用于大米中重金属Cd元素的快速检测在理论和实践上具有可行性。
