1993 Volume 14 Issue 6 Pages 352-357
A SrSe : Ce thin film is expected to be an effective blue-emitting electroluminescent material with a good chromaticity. SrSe and SrSe : Ce thin films have been prepared by utilizing a multisource deposition technique ; their structural and luminescent properties have been investigated. The quality of the films is influenced by the ratio of Sr to Se atoms arriving at the substrates. When the ratio is kept at 1 : 3, stoichiometric SrSe films are formed. The structural property depends on the substrate temperature. The SrSe films prepared at temperatures lower than 400°C indicate to be [100]-oriented and the orientation deteriorates gradually at higher temperatures than 400°C. The crystallinity, on the other hand, becomes better with increasing the substrate temperature. Both photoluminescent and electroluminescent spectra of SrSe : Ce and its EL device demon strate a blue emission with an intensity peak at about 470 nm ; these spectra shift toward longer wavelengths with increasing Ce concentration.
