微波法快速合成xSrO·yAl_2O_3:Eu^(2+)及其光学性能

Microwave synthesis of xSrO·yAl_2O_3:Eu^(2+) and their luminescence properties

在微波场作用下快速合成了铝酸锶系列发光材料xSrO.yAl2O3∶Eu2+,并利用XRD对其进行晶相分析,SEM观测晶体形貌,用荧光光度计测其激发光谱和发射光谱。结果表明,随着配料比率中Al2O3的增加,物相组成的转变趋势为由富锶相向富铝相转变:Sr3Al2O6→SrAl2O4→Sr2Al6O11→SrAl4O7,且颗粒直径呈增大的趋势。SrAl2O4的发射峰位于513nm附近的宽带谱,Sr2Al6O11的发射峰位于460nm附近的宽带谱,SrAl4O7的发射峰位于458nm附近的宽带谱。此外,适当的铝过量,会使Eu2+在Sr2Al6O11基质中的发光强度增大。

Microwave synthesis of xSrO·yAl2O3 Eu^2＋ and their luminescence p LIU Wen-fang, SONG Hui-hua, GAO Yuan-zhe （College of Chemistry and Materials Science, Hebei Normal University, Shijiazhuang 050016,China） Abstract：The luminescence materials of xSrO·yAl2O3 ：Eu^2＋ were synthesized by microwave radiation method. The crystal composition, crystal shape of the samples were characterized by X-ray diffraction （XRD） and scanning electron microscopy（SEM）. The excitation and emission spectra of fluorescence were measured with fluorometry. The results showed that with increasing of the Al2O3 content ratio of reactant gradually, aluminates rich in strontium change to the rich in aluminum, in other words, strontium aluminates are found in the order from Sr3 Al2O6, SrAl2O4 to Sr2 Al6O11 and SrAl4O7, the grain size of the particles increase. The luminescence spectra of SrAl2O4 is a broad band spectra peaking at 513nm, the luminescence spectra of Sr2Al6OH is a broad band spectra peaking at 460nm, the luminescence spectra of SrAl4O7 is a broad band spectra peaking at 458nm. In addition, a suitable excess of Al could improve light efficiency of Sr2Al6O11：Eu.