DIFFERENTIAL SPECTROSCOPIC PROPERTIES OF ND3+ UV NDGAO3 AND LAGAO3

The NdGaO3 and LaGaO3 crystals are orthorhombic perovskites, belonging to space group D-2h(16) Pbnm. The Nd3+ spectroscopic properties inclu ding both optical absorption and emission in both compounds were measu red at different temperatures between 9 and 300 K. Very high neodymium concentration is the reason for the quenching of the luminescence in the Nd compound but it allows us to observe all possible electronic tr ansitions in the 200-2500 nm region. The spectra are partially polariz ed. Though the energy level positions in both compounds are essentiall y the same, there are some unusual aspects of the Nd compound as compa red with the behavior of the La one that can not be explained by curre nt single ion theories.