Superfine Sr_2CeO_4 powder with blue-emission prepared by microemulsion method

摘要

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 deg C for 4 h was spherical with an average diameter of 70-80 nm while the samples which sintered at 900 deg C for 4 h and 1000 deg C for 4 h were shuttle-like shape and spherical respectively both with sizes less than 1 um. 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.