Luminescent properties of praseodymium-doped alkaline-earth titanates

Enhancement of emission intensity of praseodymium (Pr3+)-doped alkaline-earth titanates by Al addition has been investigated. The emission enhancement is caused by charge compensation and reduction of planar faults in the host lattices. Moreover, overlapping between the fundamental absorption-edge of MTiO3 (M=Ca; Sr; Ba) and 4f–5d transitions of Pr3+ ions probably plays an important role in the emission enhancement.