SYNTHESIS AND PHOTOLUMINESCENCE PROPERTIES OF MICRON-ALUMINA

Micron-alumina is expected to be of new properties and applications owing to its different morphology structures, which is prepared by the conventional preparation methods. X-ray diffraction (XRD) patterns present that the micron-alumina has poly-crystalline structure. Scanning electron microscopy (SEM) shows that the micron-alumina looks like a bouquet of flowers and its surface is covered with much micron-strips. Transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM) show that the micron-alumina is composed of many particles, which has polycrystalline structure. PL spectra display that emission peak of the micron-alumina centers at 301 nm, which attributes to the F+ centers. A schematic drawing for electronic transitions in the excitation and emission processes is proposed.