Photoluminescence characteristics of Li-doped CaTiO_3: Pr~(3+) thin films grown on Si (100) substrate by PLD

摘要

The effects of Li-doped CaTiO_3: Pr~(3+) thin films have been investigated by varying the lithium ion concentrations from 0 to 5 wt.%. The films have been deposited on Si (100) substrate using a pulsed laser deposition technique. Structural properties of these films have been studied by the measurement of their XRD, SEM, and AFM. The variation of Li~+ concentration influences the crystallinity and surface morphology of the CaTiO_3: Pr~(3+) thin films. As Li~+ content increases from 0 to 1 wt%, the crystallinity and intensity of emission increases. The dominant emission is from ~1D_2→~3H_4 transition at 613 nm. The ~1D_2 emission quenching has also been observed in highly doped sample and is related to the cross-relaxation process between Pr~(3+) ions.