Infrared to visible upconversion luminescence was demonstrated in trivalent Europium doped Ca_2Al_2SiO_7 crystal (Eu^(3+):Ca_2Al_2SiO_7) irradiated by focused infrared femtosecond laser.The upconversion luminescence o...Infrared to visible upconversion luminescence was demonstrated in trivalent Europium doped Ca_2Al_2SiO_7 crystal (Eu^(3+):Ca_2Al_2SiO_7) irradiated by focused infrared femtosecond laser.The upconversion luminescence originated from ~5D_0 to ~7F_j (j=1,2) transitions of Eu^(3+).The relationship between the upconversion luminescence intensity and the pump power indicated that the upconversion from near-infrared to red is dominated by a two-photon absorption process of Eu^(3+).Analysis suggested that two-photon simultaneous absorption induced population inversion should be the predominant frequency upconversion mechanism.展开更多
基金Funded by the National Natural Science Foundation of China (No.50672087 and No.60778039)National Basic Research Program of China (No.2006CB806000)National High Technology Program of China (No.2006AA03Z304)
文摘Infrared to visible upconversion luminescence was demonstrated in trivalent Europium doped Ca_2Al_2SiO_7 crystal (Eu^(3+):Ca_2Al_2SiO_7) irradiated by focused infrared femtosecond laser.The upconversion luminescence originated from ~5D_0 to ~7F_j (j=1,2) transitions of Eu^(3+).The relationship between the upconversion luminescence intensity and the pump power indicated that the upconversion from near-infrared to red is dominated by a two-photon absorption process of Eu^(3+).Analysis suggested that two-photon simultaneous absorption induced population inversion should be the predominant frequency upconversion mechanism.
