100G SR4光模块具有传输速率高、技术成熟和成本低等优势,已广泛应用于数据中心和数据通信接入网等领域。文中采用板上芯片封装(chip on board,COB)封装技术对100G SR4光模块电路、光路部分进行了开发设计,并采用自制测试系统对模块的...100G SR4光模块具有传输速率高、技术成熟和成本低等优势,已广泛应用于数据中心和数据通信接入网等领域。文中采用板上芯片封装(chip on board,COB)封装技术对100G SR4光模块电路、光路部分进行了开发设计,并采用自制测试系统对模块的发射接收性能进行了测试。测试结果表明,该模块完全符合协议的各项指标,可满足100 m短距离高速数据通信系统的要求。展开更多
A highly intense green-emitting phosphor of Eu2＋-doped Sr4Al14O25 （SAE：Eu2＋） was synthesized by a solid state reaction. In this study, XRD, PL/PLE, QE, thermal stability and LED package tests are systematically c...A highly intense green-emitting phosphor of Eu2＋-doped Sr4Al14O25 （SAE：Eu2＋） was synthesized by a solid state reaction. In this study, XRD, PL/PLE, QE, thermal stability and LED package tests are systematically carried out and investigated. The optimized-composition of （Sro 92Eu0.08）4Al14025 exhibited a green emission peak at 497 nm under excitation wavelength of 400 nm, giving the chromaticity coordinates of （0.14, 0.35） with excellent quantum efficiency （98%） compared to those of other green-commodities, such as Ba2SiO4：Eu2＋ （90%） and BaMgAl10O17：EU2＋, Mn2＋ （92%）. The results demonstrated that SAE：Eu2＋ could be a potential candidate as the NUV-pumping phosphor for applications in light-emitting diodes （LEDs）.展开更多
A series of RE3＋ （RE = Eu/Tb/Ce）-activated Sr4La（PO4）3O （SLPO） phosphors are synthesized with a high- temperature solid-state reaction method. The photoluminescence properties, thermal stability, morphology, an...A series of RE3＋ （RE = Eu/Tb/Ce）-activated Sr4La（PO4）3O （SLPO） phosphors are synthesized with a high- temperature solid-state reaction method. The photoluminescence properties, thermal stability, morphology, and CIE values of the SLPO：EuS＋/Tb3＋/Ce3＋ phosphors are investigated. Under 394 nm excitation, the SLPO：Eu3＋ exhibits red emission, and the SLPO：Tb3＋ presents a green emission upon 379 nm excitation, while Ce3＋-doped SLPO has a broad emission band ranging from 370 to 650 nm under 337 nm excitation. The investigation results indicate that the SLPO：Eu3＋/Tb3＋/Ce3＋ phosphors can be effectively excited by near- ultraviolet light and may have the potential to serve as red-, green-, and blue-emitting phosphors for applications in white light-emitting diodes.展开更多
A series of mixed oxides Sr4Fe6-xCoxO13-δ （x=0, 1, 2, 3, or 4） were prepared by sol-gel method and used for catalytic combustion of methane. The structural properties of oxides were characterized by XRD, TGA, and X...A series of mixed oxides Sr4Fe6-xCoxO13-δ （x=0, 1, 2, 3, or 4） were prepared by sol-gel method and used for catalytic combustion of methane. The structural properties of oxides were characterized by XRD, TGA, and XPS. The layered intergrowth perovskite-like oxide Sr4FesCoO13 8 exhibits the highest catalytic activity for methane combustion under the experimental conditions. The enhanced catalytic activity of Sr4FesCoO13-δfor methane combustion could be attributed to the increased amount of oxygen vacancy caused by the partial substitution of cobalt for iron in the Sr4Fe6O13, which was confirmed by TGA and XPS.展开更多
It is widely recognized that the development of ZABs is impeded by the kinetic bottleneck of oxygen evolution reaction(OER)and oxygen reduction reaction(ORR).The application of conformational entropy strategy to oxide...It is widely recognized that the development of ZABs is impeded by the kinetic bottleneck of oxygen evolution reaction(OER)and oxygen reduction reaction(ORR).The application of conformational entropy strategy to oxides often involves introducing multiple elements with different properties,thereby providing outstanding bifunctional catalytic activity for OER/ORR.Nevertheless,the possible underlying catalytic pathways and potential interactions between various components are still poorly understood.This paper presents an excellent medium-entropy perovskite oxide,Sr(FeCoNiMo)_(1/4)O_(3−δ)(lower overpotential of 301 mV at 10 mA cm^(−2)).Zinc-air batteries employing it as a cathode catalyst demonstrate excellent round-trip efficiency(62%).By combining theoretical calculation with experiments,we aim to establish the link between the electronic structure of perovskite oxides with different elemental compositions and their OER mechanism.Research reveals that the conformational entropy strategy can simultaneously shift the O 2p-band center and metal d-band center of perovskite oxide towards the vicinity of the Fermi energy level,thereby triggering a more favorable lattice oxygen-participated mechanism(LOM)during the OER process.The outcomes of this work provide crucial insights into the role of conformational entropy strategies in oxygen catalysis and offer potential avenues for constructing efficient and stable electrocatalysts.展开更多
文摘A highly intense green-emitting phosphor of Eu2＋-doped Sr4Al14O25 （SAE：Eu2＋） was synthesized by a solid state reaction. In this study, XRD, PL/PLE, QE, thermal stability and LED package tests are systematically carried out and investigated. The optimized-composition of （Sro 92Eu0.08）4Al14025 exhibited a green emission peak at 497 nm under excitation wavelength of 400 nm, giving the chromaticity coordinates of （0.14, 0.35） with excellent quantum efficiency （98%） compared to those of other green-commodities, such as Ba2SiO4：Eu2＋ （90%） and BaMgAl10O17：EU2＋, Mn2＋ （92%）. The results demonstrated that SAE：Eu2＋ could be a potential candidate as the NUV-pumping phosphor for applications in light-emitting diodes （LEDs）.
基金supported by the National Natural Science Foundation of China(NSFC)(No.11604115)the Educational Commission of Jiangsu Province of China(NO.17KJA460004)
文摘A series of RE3＋ （RE = Eu/Tb/Ce）-activated Sr4La（PO4）3O （SLPO） phosphors are synthesized with a high- temperature solid-state reaction method. The photoluminescence properties, thermal stability, morphology, and CIE values of the SLPO：EuS＋/Tb3＋/Ce3＋ phosphors are investigated. Under 394 nm excitation, the SLPO：Eu3＋ exhibits red emission, and the SLPO：Tb3＋ presents a green emission upon 379 nm excitation, while Ce3＋-doped SLPO has a broad emission band ranging from 370 to 650 nm under 337 nm excitation. The investigation results indicate that the SLPO：Eu3＋/Tb3＋/Ce3＋ phosphors can be effectively excited by near- ultraviolet light and may have the potential to serve as red-, green-, and blue-emitting phosphors for applications in white light-emitting diodes.
基金Project supported by the National Natural Science Foundation of China （No. 50442024） and the Natural Science Foundation of Education Agency of Anhui Province （No. KJ2009A023Z）.
文摘A series of mixed oxides Sr4Fe6-xCoxO13-δ （x=0, 1, 2, 3, or 4） were prepared by sol-gel method and used for catalytic combustion of methane. The structural properties of oxides were characterized by XRD, TGA, and XPS. The layered intergrowth perovskite-like oxide Sr4FesCoO13 8 exhibits the highest catalytic activity for methane combustion under the experimental conditions. The enhanced catalytic activity of Sr4FesCoO13-δfor methane combustion could be attributed to the increased amount of oxygen vacancy caused by the partial substitution of cobalt for iron in the Sr4Fe6O13, which was confirmed by TGA and XPS.
基金the financial support from the National Natural Science Foundation of China (51872067 and 21773048)
文摘It is widely recognized that the development of ZABs is impeded by the kinetic bottleneck of oxygen evolution reaction(OER)and oxygen reduction reaction(ORR).The application of conformational entropy strategy to oxides often involves introducing multiple elements with different properties,thereby providing outstanding bifunctional catalytic activity for OER/ORR.Nevertheless,the possible underlying catalytic pathways and potential interactions between various components are still poorly understood.This paper presents an excellent medium-entropy perovskite oxide,Sr(FeCoNiMo)_(1/4)O_(3−δ)(lower overpotential of 301 mV at 10 mA cm^(−2)).Zinc-air batteries employing it as a cathode catalyst demonstrate excellent round-trip efficiency(62%).By combining theoretical calculation with experiments,we aim to establish the link between the electronic structure of perovskite oxides with different elemental compositions and their OER mechanism.Research reveals that the conformational entropy strategy can simultaneously shift the O 2p-band center and metal d-band center of perovskite oxide towards the vicinity of the Fermi energy level,thereby triggering a more favorable lattice oxygen-participated mechanism(LOM)during the OER process.The outcomes of this work provide crucial insights into the role of conformational entropy strategies in oxygen catalysis and offer potential avenues for constructing efficient and stable electrocatalysts.
