Optical and Electrical Properties of Thin Film Electroluminescent Devices with SrS:Cu, Ag Phosphor Layer

Optical and Electrical Properties of Thin Film Electroluminescent Devices with SrS:Cu, Ag Phosphor Layer

The SrS:Cu, Ag thin film electroluminescient devices were fabricated on AlTiO₃/ITO/glass substrates by electron-beam evaporation. The emission spectrum of the device was about 460 nm with x=0.20, y=0.29 in the CIE color coordinator. It was found that the emission spectrum was saturated to pure blue color when Ag sensitizer was doped in SrS:CuCl phosphors. The luminance of the device was increased by increasing the sulfur pressure. The measured luminance was saturated with 430 cd/m² at the applied voltage of 90 V and the maximum luminance was 580 cd/m² at 110V. The polarization charge and conduction charge of the devices were found to be found to be about 3.5μC/cm² and 7.4μC/cm², respectively.