A new blue emitting TFEL phosphor: SrS:Cu

摘要

A highly efficient new blue emitting electroluminescent(EL)phosphor material, SrS:Cu, was developed. A wide range of EL char- acteristics of SrS:Cu can be achieved by varying co-dopant material. While the singly doped SrS:Cu thin film EL(TFEL)devices have a cyan color with "CIE y" varying between 0.27 and 0.32, the SrS:Cu devicesco-doped with Ag exhibit a true color, e.g., CIE y = 0.13-0.22. the luminous efficiency of SrS:Cu, Ag, e.g. 0.15-0.24 lm/W is much higher than the existing blue EL phosphors, e.g. (SrCa)Ga_2S_4:Ce and blue filtered SrS:Ce, when the color is matched.