Spectral properties of rare-earth ions in YAlO3 crystals

Abstract

YAlO, crystals have been prepared with small percentages of different rare earths substituted for yttrium. The absorption and luminescence spectra of the samples activated with Dy, Ho, Er, Tm, and Yb have been measured a t 77 K. An analysis of these spectra gave the positions of many of the crystalline Stark levels. Stimulated emission has been observed from Ho3+, Er3+, and Tm3+ ions in crystals of YAlO,. Es wurden YAl0,-Kristalle mit geringen Dotierungen Seltener Erden, deren Einbau auf Yttrium-Plltze erfolgte, gezuchtet, Die Absorptions-und Lumineszenz-Spektren der mit Dy, Ho, Er, Tm und Yb dotierten Proben wurden bei 77 K gemessen. Die Analyse dieser Spektren ergab die Lage einer Vielzahl der Stark-Niveaus. Es werden Angaben zur stimulierten Emission von Ho3+, Er3+ und Tm3+ in YAIO, gemacht.

Spectroscopic and magnetic susceptibility analyses of the 7FJ and 5D4 energy levels of Tb3+(4f8) in TbAlO3

“…The Tb 3+ ions occupy low-symmetry sites (C s ) that experience a crystal field environment leading to a large anisotropy in the magnetic moments [5,[11][12][13][14]. Consequently, investigating the magnetic properties of Tb 3+ (4f 8 ) in the stoichiometric compound represents part of the rational for the present study.…”

Anisotropy of optical absorption spectra of rare‐earth orthoaluminate DyAlO3

“…Firstly, in the low-symmetry structure of the orthoaluminate there are two crystallographic non-equivalent positions of the RE Dy 3+ ion. Their contribution to the resulting optical absorption of DyAlO 3 will define an absorption anisotropy with the geometry of the experiment and the orientation of the crystal, which has not been considered practically by previous works [1][2][3][4].…”

“…However, knowledge about the energy structure, spectroscopic parameters, and symmetry of the wave functions for a number of high-energy levels of the Dy 3+ ion in the orthorhombic structure of orthoaluminate (E ≥ 10 000 cm -1 ) remains until now quite limited. The circumstance plays an important role that for the optical spectra of this rare-earth compound (also of TbAlO 3 [3], Er x Y 1-x AlO 3 , Ho x Y 1-x AlO 3 [4], etc. ), measured along the different crystallographic directions of the orthorhombic crystal, both the number of absorption lines under observation and their intensities are very often in disagreement with theoretical predictions [5][6][7].…”

“…If we take into consideration a small number of these studies [1][2][3][4] then it becomes evident that a more complete spectroscopic study of this crystal is needed. It should be considered both a contribution of the mechanism of the J-J "mixing" of the excited RE Dy 3+ ion multiplets and features of the Stark splitting of electronic states of the RE ion and its positioning in the crystallographic structure of orthoaluminate.…”

“…Optical polarization spectroscopy of rare-earth (RE) orthoaluminate RAlO 3 (where R is the threevalent rare-earth ion) provides an effective study of the energy spectra for the RE ions [1][2][3][4].…”