Destruction of the short‐range disorder due to erbium doping in Pb_0.8La_0.2TiO₃films

Abstract

We show the destruction of a displacement of Ti in the short-range structure by observing the disappearance of emission and Raman signals when the Er 3+ concentration exceeds 7 mol% in sol-gel-derived Pb 0.8 La 0.2 TiO 3 polycrystalline films. It is believed that there always exists disorder due to displacement of B ions in the skeleton of BO 6 in perovskite ABO 3 materials. This disorder due to the displacement of Ti ions breaks the center of symmetry to activate emission of rare-earth ions such as Er 3+ and Raman modes of perovskites. We found that the breaking of symmetry can be diminished by introducing more Er 3+ ions.

Recent advances in linear and nonlinear Raman spectroscopy. Part V

“…Huang et al . demonstrated the destruction of a displacement of Ti in the short‐range structure of a film of Pb 0.8 La 0.2 TiO 3 by observing the disappearance of emission and Raman signals when the Er 3+ concentration exceeded 7 mol.% in sol–gel‐derived polycrystalline films . They found that symmetry breaking can be diminished by introducing more Er 3+ ions.…”

“…Huang et al demonstrated the destruction of a displacement of Ti in the short-range structure of a film of Pb 0.8 La 0.2 TiO 3 by observing the disappearance of emission and Raman signals when the Er 3+ concentration exceeded 7 mol.% in sol-gel-derived polycrystalline films. [204] They found that symmetry breaking can be diminished by introducing more Er 3+ ions. Rossella et al published the results of a systematic study performed by micro-Raman spectroscopy on pure anatase, pure rutile and mixed anatase-rutile TiO 2 thin films, deposited by radio frequency magnetron sputtering on quartz substrates, with different thicknesses.…”