Extraction studies on the formation of La(III), Gd(III) and Lu(III) species with 5,7dihalogeno derivatives of 8-hydroxyquinoline

Absorption and emission spectra of CdF2:0.5% SmF3 crystal were investigated. The emission spectra were studied in the temperature range 6-300 K. It has been demonstrated that apart from the narrow f-f transitions of the Sm3+ ion there appears a broad band emission whose nature is briefly discussed.