Relation between photoluminescence emission and local order-disorder in the CaTiO_3 lattice modifier

摘要

In this letter, the authors propose that photoluminescence emission in CaTiO_3 is affected not only by disorder in the lattice former but also by structural disorder in the lattice modifier. Structural disorder was evaluated by Ti, Ca K-edge x-ray absorption near-edge structure experiments and by photoluminescence emission. The preedge feature of the Ca K edge was related to the intensity of photoluminescence emission. The results of the preedge feature of the Ca K-edge x-ray absorption near-edge structure confirm the presence of different Ca coordination numbers, namely, Ca-O_(11) and Ca-O_(12).