High pressure spectroscopy of Pr3+ in LiNbO3

• Published in: Journal of alloys and compounds 2004-10, Vol.380 (1-2), p.230-234
• Main Authors: Gryk, W., Kukliński, B., Grinberg, M., Malinowski, M.
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; High pressure spectroscopy; LiNbO3; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Other solid inorganic materials; Photoluminescence; Physics; Pr3; Praseodymium ion
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2004.03.049

Absorption, emission, and luminescence excitation spectra of the LiNbO3 crystal doped with 0.5% Pr3+ and 0.8% Yb3+ are presented. Additionally the photoluminescence spectra at high pressure have been measured. Hydrostatic pressures up to 135kbar were applied with a diamond anvil cell. Absorption of the Pr3+:LiNbO3 crystal is characterized by the strong threshold at about 400nm, related to the band-to band-transitions and the sharp structure in the visible region attributed to the transitions to 3PJ and 1D2 levels of Pr3+ ion. After the 488nm excitation the yellow emission related to the 1D2→3HJ transition of Pr3+ have been observed when the 3P0 emission has not been detected. The excitation spectra of the 1D2 luminescence consist of the sharp lines related to the 3H4→3PJ (J=0, 1, 2) transitions and two broad bands peaked at 340 and 400nm related probably to the bound exciton. The 1D2→3HJ emission shifts with pressure toward the lower energies with the rate of −2.4cm−1kbar−1. Additionally, for higher pressures the 1D2 emission is considerably quenched. This is explained as being due to the decrease of the energy of the bound exciton with pressure which results in the higher nonradiative depopulation rate of the 1D2 state.