Nanometer-sized BaTiO3 dielectric layer for inorganic electroluminescence

The effect of the size of a ferroelectric barium titanate (BaTiO3) powder on the dielectric layer of an inorganic powder electroluminescent (EL) device was investigated-two nanometer (300 and 500 nm)-sized and one micrometer (2 μm)-sized powder were chosen. Improvements in the dielectric properties, such as a high dielectric constant and a low dielectric loss, were achieved for the nanometer-sized BaTiO3 powders. These dielectric properties could lead to an increased charge density in the phosphor primarily due to the increased specific surface area of the BaTiO3 powder particles in the dielectric layer, where the increased specific surface area arises from the high packing density of the BaTiO3 powder. Based on the above results, nanometer-sized BaTiO3 powder particles enhanced the brightness and the efficiency of the EL device, which helped to expand the potential applications of the EL devices.