Superfine Sr 2CeO 4 powder with blue-emission prepared by microemulsion method

• Published in: Materials letters Vol. 59; no. 8; pp. 948 - 952
• Main Authors: Xing, De-Song, Shi, Jian-Xin, Gong, Meng-Lian
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2005
• Subjects: Blue-emission; Microemulsion; Sr 2CeO 4; Superfine; Superfine; Microemulsion; Sr 2CeO 4; Blue-emission
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2004.10.071

Powder samples of Sr 2CeO 4 were prepared by microemulsion-heating method. Field emission scanning electron microscopy (FE-SEM) images showed that the sample fired at 850 °C for 4 h was spherical with an average diameter of 70∼80 nm while the samples which sintered at 900 °C for 4 h and 1000 °C for 4 h were shuttle-like shape and spherical respectively both with sizes less than 1 μm. X-ray diffraction (XRD) patterns disclosed that the superfine Sr 2CeO 4 exhibited an orthorhombic crystal structure. Room-temperature photoluminescence (PL) analysis indicated that there were three excitation peaks located at around 260, 280, and 350 nm, and all the Sr 2CeO 4 samples showed intensely blue emission at 470 nm. Compared with Sr 2CeO 4 samples prepared with other methods, the Sr 2CeO 4 phosphor fabricated with this method had a controllable shape with smaller size, lower calcination temperature, and shorter calcinations time.