Sm3＋-activated Y2028 red phosphors were prepared by the combustion method and microemulsion method at the first time. X-ray characterization and electron diffraction show that, Y202S：Sm3＋, Ti4＋, Mg2＋ samples prep...Sm3＋-activated Y2028 red phosphors were prepared by the combustion method and microemulsion method at the first time. X-ray characterization and electron diffraction show that, Y202S：Sm3＋, Ti4＋, Mg2＋ samples prepared by these two methods are pure hexagonal crystals in structure with a trivial change due to dopants. Scanning electron microscopy （SEM） results show that the product presents an almond-like sheet in uniform size. Under the excitation of 269 nm ultraviolet light, Y202S：Sm3＋ samples fabricated by these two methods exhibit three main groups of red emission lines located at 564, 604, and 656 nm, respectively, which are attributed to the transitions of 4G5/2 →6H5/2, 4G~/2 →6H7/2, 4G5/2 →6H9/2, respectively. The samples prepared by microemulsion are seven times higher in fluorescent emission intensity and half time longer in afterglow time than that prepared by combustion.展开更多
Deepwater area has been one of the hottest areas in the global hydrocarbon exploration.However,deepwater hydrocarbon exploration in China started late and mainly concentrated in the South China Sea(SCS) with low level...Deepwater area has been one of the hottest areas in the global hydrocarbon exploration.However,deepwater hydrocarbon exploration in China started late and mainly concentrated in the South China Sea(SCS) with low level of researches.Although there are some achievements,there are even more challenges.For this reason,this paper reviewed the history of deepwater exploration in China Seas and summarized the current exploration situation.The future directions of deepwater hydrocarbon exploration mainly consist of five aspects:establishing key technology system of complex structure and reservoir seismic acquisition and processing in deepwater areas of SCS,clarifying the development mechanism of high quality source rock and establishing matching assessment technology,studying the formation conditions of favorable reservoir and creating reservoir identification technology,improving accumulation theory of large and medium-sized oil and gas field of deepwater,deepening the researches of petroleum geology conditions of middle and south part of SCS.Simultaneously,the concept of portfolio should be utilized in the exploration process,with economic benefits considered.These understandings will help guiding the future deepwater hydrocarbon exploration in China Seas.展开更多
基金financially supported by the Basic Theory Research Fund of Research Institute of Metallurgy Engineering,University of Science and Technology Beijing(No.YJ2012-009)
文摘Sm3＋-activated Y2028 red phosphors were prepared by the combustion method and microemulsion method at the first time. X-ray characterization and electron diffraction show that, Y202S：Sm3＋, Ti4＋, Mg2＋ samples prepared by these two methods are pure hexagonal crystals in structure with a trivial change due to dopants. Scanning electron microscopy （SEM） results show that the product presents an almond-like sheet in uniform size. Under the excitation of 269 nm ultraviolet light, Y202S：Sm3＋ samples fabricated by these two methods exhibit three main groups of red emission lines located at 564, 604, and 656 nm, respectively, which are attributed to the transitions of 4G5/2 →6H5/2, 4G~/2 →6H7/2, 4G5/2 →6H9/2, respectively. The samples prepared by microemulsion are seven times higher in fluorescent emission intensity and half time longer in afterglow time than that prepared by combustion.
文摘Deepwater area has been one of the hottest areas in the global hydrocarbon exploration.However,deepwater hydrocarbon exploration in China started late and mainly concentrated in the South China Sea(SCS) with low level of researches.Although there are some achievements,there are even more challenges.For this reason,this paper reviewed the history of deepwater exploration in China Seas and summarized the current exploration situation.The future directions of deepwater hydrocarbon exploration mainly consist of five aspects:establishing key technology system of complex structure and reservoir seismic acquisition and processing in deepwater areas of SCS,clarifying the development mechanism of high quality source rock and establishing matching assessment technology,studying the formation conditions of favorable reservoir and creating reservoir identification technology,improving accumulation theory of large and medium-sized oil and gas field of deepwater,deepening the researches of petroleum geology conditions of middle and south part of SCS.Simultaneously,the concept of portfolio should be utilized in the exploration process,with economic benefits considered.These understandings will help guiding the future deepwater hydrocarbon exploration in China Seas.
