Spectroscopic characterization of LaAlO3 crystal doped with Tm3+ ions

This work presents the result of spectroscopic research on LaAlO3 crystal doped with Tm3+ ions. The host possesses perovskite structure. The investigated sample was single crystal, grown by the Czochralski method. Absorption and emission as well as decay profiles were measured in visible and the IR range at room and at low (77 K) temperature. Under excitation matching several excited states emission from the 1D2 (27 700 cm-1), 1I6 + 3P0 (28 600 cm-1), 3H4 (12 400 cm-1 and 6800 cm-1) and 3F4 (5800 cm-1) levels was obtained together with theses strong bands other weaker transitions were registered. The decay times are short for the violet and blue emission and significantly longer for the red and IR emission (at the room temperatures values are 22 μs and 5.8 ms for 1D2 and 3F4 levels, respectively). The system is discussed in terms of Tm3+ energy levels structure. Further investigations are considered.