The photoluminescence of ZnO films deposited on Si substrates by reactive dc sputtering has been studied by using a synchrotron radiation(SR)light source.The excitation spectra show a strong excitation band around 195...The photoluminescence of ZnO films deposited on Si substrates by reactive dc sputtering has been studied by using a synchrotron radiation(SR)light source.The excitation spectra show a strong excitation band around 195 nm related to 390 nm emission band.Under SR vacuum ultraviolet excitation,a new emission band peaked at 290 nm was found for the first time,besides the ultraviolet emission band(390 nm)and green band(520 nm).展开更多
The emission and excitation spectra of cubic PbF_(2):Gd were measured.Compared with pure crystals,the emissions from Gd^(3+) were observed upon cation exciton excitation in lattices,while the emission from intrinsic s...The emission and excitation spectra of cubic PbF_(2):Gd were measured.Compared with pure crystals,the emissions from Gd^(3+) were observed upon cation exciton excitation in lattices,while the emission from intrinsic self-trapped exciton was quenched.It indicates the energy transfer from exciton to the 4f state of Gd^(3+).展开更多
基金Supported by the National Natural Science Foundation of China under Grant Nos.19874057 and 59872037.
文摘The photoluminescence of ZnO films deposited on Si substrates by reactive dc sputtering has been studied by using a synchrotron radiation(SR)light source.The excitation spectra show a strong excitation band around 195 nm related to 390 nm emission band.Under SR vacuum ultraviolet excitation,a new emission band peaked at 290 nm was found for the first time,besides the ultraviolet emission band(390 nm)and green band(520 nm).
文摘The emission and excitation spectra of cubic PbF_(2):Gd were measured.Compared with pure crystals,the emissions from Gd^(3+) were observed upon cation exciton excitation in lattices,while the emission from intrinsic self-trapped exciton was quenched.It indicates the energy transfer from exciton to the 4f state of Gd^(3+).
