Thin film perovskite electroluminescence with ferroelectric BaTiO3 films as insulating layers

Electroluminescence with BaTiO3(BTO)/ ((Ca0.6Sr0.4)(0.997)Pr-0.002)TiO3 (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 I3V 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 P-r3+ ions from the D-1(2) state to the H-3(4) state.