Studies on AC Electroluminescence Device Made of BaTiO3–CaTiO3:Pr3+Diphase Ceramics

Ac electroluminescence (EL) from non-sulfide EL device made of BaTiO 3 –CaTiO 3 :Pr 3+ diphase ceramics is investigated. A series of dielectric/phosphor/dielectric sandwich structures are formed spontaneously in the solid-state reaction process. The EL mechanism is discussed using the electric current density–electric field ( J – E ) relation. Above the threshold of electric field, the initial electrons emitted from the interface of Ba 0.77 Ca 0.23 TiO 3 :Pr dielectric and Ba 0.1 Ca 0.9 TiO 3 :Pr phosphor into the phosphor by the Schottky emission, are accelerated to impact and excite Pr 3+ . Then the EL is produced.