Preparation and luminescent properties of SrSe:Ce thin films

Abstract

SrSe thin films doped with Ce which are expected to be effective for blue-emitting thin film electroluminescent (TFEL) devices with good chromaticity have been prepared by a multi-source deposition technique, and their luminescent properties have been investigated. The structural properties and quality of the films are considerably influenced by the ratio of Sr atoms to Se arriving at the substrate. The properties are also sensitive to the substrate temperature. When the ratio is kept at 1 : 3, the SrSe films prepared at substrate temperature of 400°C and at temperatures higher than 500°C show [100] and rather random orientations, respectively. On the other hand, the crystallinity is improved with increasing substrate temperature. It is found that the luminescence of SrSe:Ce films changes from blue to green when increasing the contents of Ce, therefore, the control of the contents of Ce is important in order to develop the blue-emitting TFEL devices.