Wydział Chemii

Mirosław Karbowiak

Radosław Lisiecki

Piotr Solarz

Jarosław Komar

Witold Ryba-Romanowski

2018

Journal of Alloys and Compounds

740

1165-1171

10.1016/j.jallcom.2018.01.058

Naukowa

Angielski

Artykuł

The CsCaI₃ single crystals doped with Tm²⁺ were grown by Bridgman technique. Divalent thulium luminescence related to the 4f¹³-4f¹³ intra-configurational and 4f¹²5d¹-4f¹³ inter-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 4f¹²5d¹ excited 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 → 4f¹³ luminescence quenching was estimated and high value of ²F_5/2 → ²F_7/2 emission cross-section was determined in CsCaI₃:Tm²⁺. Our spectroscopic study was performed to complement and verify the previous investigation in this field.

Rare earth alloys and compounds, Optical absorption spectroscopy, Divalent thulium, CsCaI3, Excited state excitation

http://dx.doi.org/10.1016/j.jallcom.2018.01.058

http://www.elsevier.com