Spectroscopic peculiarities of CsCaI 3:Tm 2+ single crystals examined through one-photon and excited state excitation spectroscopy

摘要

AbstractThe CsCaI3single crystals doped with Tm2+were grown by Bridgman technique. Divalent thulium luminescence related to the 4f13-4f13intra-configurational and 4f125d1-4f13inter-configurational transitions were analyzed as a function of temperature. Excited state excitation spectroscopy has been applied within a wide spectral range to examine peculiarities of transitions between different 4f125d1excited states of Tm2+. This two-color excitation experiment was useful to assess d-d photon-absorption processes that are relevant to observed up-conversion phenomena attributed to effective anti-Stokes green luminescence around 550?nm. Furthermore, activation energy of 4f125d1→ 4f13luminescence quenching was estimated and high value of2F5/2?→?2F7/2emission cross-section was determined in CsCaI3:Tm2+. Our spectroscopic study was performed to complement and verify the previous investigation in this field.Highlights?Excited state excitation spectra are presented for Tm2+in CsCaI3.?The 4f125d1→ 4f13luminescence was analyzed in the function of temperature.?Activation energy of 4f125d1→ 4f13luminescence quenching was estimated.?A high value of2F5/2?→?2F7/2emission cross-section was determined.]]>