Study on lattice dynamics of sol-gel derived Pb1-xLaxTiO3 thin films and optical properties of Er-doped Pb0.8La0.2TiO3 thin films

• Main Authors: Tung-Ching Huang, 黃同慶
• Other Authors: Wen-Feng Hsieh
• Format: Others
• Language: en_US
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/24353917616010796346

碩士 === 國立交通大學 === 光電工程所 === 91 === This work makes a study of the lattice dynamics of Pb1-xLaxTiO3 thin films by Raman spectroscopy, and the luminescence mechanism of erbium-doped Pb0.8La0.2TiO3 films. All samples were prepared by sol-gel method. In the Pb1-xLaxTiO3 (PLT) system, we found that considering Ti-disorder induced background is necessary during the analysis of Raman spectra. The giant splitting of longitudinal optical (LO) and transverse optical (TO) phonon modes has been found while x increased from 0.00 upward 0.20. The decreasing LO-TO splitting, which is the same with Pb1-xLaxTiO3 (PST) system, was observed in Pb1-xLaxTiO3 (PLT) system. The change of effective charge to the LO-TO splitting is the dominant mechanism in PLT. In addition, the dependence of green luminescence efficiency on Er+3 concentration and sintering temperature in the Er-doped Pb0.8La0.2TiO3 thin films is governed by crystallinity and ion-ion interaction. Our study indicates that the observed green emission reaches maximum at 3 mol % Er dopant concentration with the best crystallinity.