Growth and photoluminescence of (001)-oriented RMoO_4 films by chemical solution deposition

摘要

RMoO_4 (RMO, R = Ca, Sr, Ba) films were fabricated on LaAlO_3 (LAO) substrates using chemical solution deposition method. The derived RMO films are highly (00l)-orientated with good crystallization. The photoluminescence (PL) emission spectra show that the CaMoO_4 (CMO) and SrMoO_4 (SMO) films have an intrinsic broad green emission band centered at 500 nm whereas BaMoO_4 (BMO) film has a broad orange emission band resulting from the PL of molybdate group with an oxygen ion deficiency. The highly (001)-oriented CMO film on LAO has better PL property than that of CMO film on Si substrate, which is ascribed to higher crystalline integrity and lower light scattering.