Al_2O_3微米树的制备及其发光性能研究

Preparation and Luminescence Characteristics of Alumina Micron-tree

以草酸为电解液，采用两次阳极氧化的方法，制备了Al2O3微米树．用X射线衍射仪（XRD）、扫描电子显微镜（SEM）及荧光分光光度计对所制备的Al2O3微米树进行了分析．结果表明，在一定的实验条件下，可以得到形状类似于树状的a—Al2O3其树干尺寸为600-800nm，并且由α—Al2O3的颗粒均匀堆积而成．其荧光发射峰在304nm，与氧空位有关，属于F^＋型（1B→1A）电子跃迁，并对其发光机制进行了讨论．

By using oxalic acid as the electrolyte and two-step anodic oxidation, alumina micron-trees were prepared, which were analyzed through X-ray diffraction （XRD）, scanning electron microscopy （SEM JSM-6700F） and spectrophotometer. The results have indicated that, under some conditions, the a -A1203 shaped-like trees can be obtained, whose bole consists of grains sized between 600 nm and 800 nm. The PL spectra of alumina micron-trees were related with the oxygen vacancies, whose main emission peak was at 304 nm. The emission spectra were attributed to F^＋ （1B→IA）. Finally, the luminescence mechanisms were also discussed.