Luminescence dynamics of YAl3(BO3)4:Sm3+ crystals

- YAl3(BO4)3:Sm3+ crystals have been grown by the flux growth method.
- The absorption spectra have been analyzed in the frame of the Judd-Ofelt theory.
- The luminescence properties have been explored in the visible range.
- The emission dynamics have been investigated and characterized.

YAl3(BO3)4 crystals doped with Sm3+ were grown from potassium trimolybdate flux. Their absorption and emission spectra were measured at room temperature. The Judd-Ofelt parametrization scheme has been applied to the analysis of the room temperature absorption spectra. The emission decay profiles were measured at 77 and 298 K on differently concentrated crystals in order to obtain information on the excited states dynamics. The calculated radiative lifetime of the 4G5/2 state is 2.3 ms, and it is reasonably consistent with the experimental results. The analysis of the concentration and temperature effects on the decay curves allowed a reliable understanding of the energy transfer processes responsible for the non radiative decay of the emitting excited level in the investigated material.