SRS-CE THIN-FILMS ON DIFFERENT INSULATING UNDER LAYERS

SrS:Ce thin films were prepared on several kinds of insulating underla yers, Ta2O5, SiO2, Si3N4 and their composite films, by hot wall deposi tion. The crystallinity of the SrS:Ce films was found to depend strong ly upon the underlayers, although no crystal structures were confirmed for the underlayers. The SrS:Ce films grown directly on Ta2O5 layers gave the best crystallinity, and better luminance levels were also obt ained for their electroluminescent devices, due to both the large diel ectric constant of Ta2O5 and good crystallinity of the SrS:Ce films.