Thin film perovskite electroluminescence with ferroelectric BaTiO_3 films as insulating layers

摘要

Electroluminescence with BaTiO_3(BTO) / ((Ca_(0.6)Sr_(0.4))_(0.997)Pr_(0.002))TiO_3 (PSCTO) / BTO thin films at 1 kHz ac source was obtained with the driving voltages around 8 V by visual estimation. With further increasing driving voltages, intensity of electroluminescence dramatically increased Furthermore,electroluminescence with BTO/ PCSTO/ BTO/ PSCTO / BTO thin films at 1 kHz ac source was obtained with the driving voltages around 11 V. With further increasing driving voltages, intensity of electroluminescence dramatically increased. A sharp electroluminescence peak around 610 nm under 13 V becomes much stronger with increasing ac voltage up to 20 V. Luminescence intensity increases with the increase in applied voltage, and it is as high as over 1.35 cd/m~2. These peaks were assigned to the transition of Pr~(3+) ions from the ~1D_2 state to the ~3H_4 state.