Preparation of Mixed Perovskite Oxides for Blue-Green Lasers

Abstract

Abstract : Mixed crystals of the perovskite type structure of the system La A1 1-x Sc x, 03 were examine dover the compositions of x= 0.15-0.30. Single crystals were grown from melts in iridium crucibles using the Czochralski method. Seed crystals of (111) pure La A1 Q3, were used. The growth atmosphere was controlled at 99.75% N2 and 0.25% H2. Dopants of Ce3+ were maintained at 0. 01-0.05 atomic per cent. Preliminary work on polycrystalline materials showed that blue-green luminescence at 485 nm was found. The grown crystals had various amounts of Sc incorporated and were usually translucent. At the x= .30 formulation of melt, about 60 - 75% of Sc is believed to enter the crystal. No direct evidence was found for ordered type structures. The phase data, compositions, crystal quality, luminescence data, and x-ray results are discussed.