Phase transition of YPO4 crystal induced splitting of 5D0→7F1 of doped Eu3+ ions

Abstract

Abstract For the first time, we investigated the crystal field dependent fine structure splitting in different crystal phases (pure tetragonal (T), pure hexahedral (H), (H\xa0+\xa0T) and (T\xa0+\xa0H)) of Eu3+:YPO4 crystals. We observed that each phase with its unique point group site symmetry results in unique fine structure splitting. The fine structure of T-phase and H-phase splits into two- and three-energy levels, respectively. By controlling temperature, the influence of dressing-phonon competition on the linewidth of spectral signal is also discussed. In T-phase Eu3+:YPO4, one spectral peak splits into three peaks under the action of stress and dressing field as temperature is reduced from 300\xa0K to 77\xa0K. The relationship between temporal and spectral intensity in different phases of Eu3+:YPO4 is also discussed. The Pr3+ ion has a stronger dressing than the Eu3+ ion in a host material of YPO4 which can be explained from higher dipole moment. To further explore this comparison, we investigated intensity-noise correlation under nonlinear phase controlled by time delay in both Eu3+:YPO4 and Pr3+:YPO4.