长余辉材料SrAl_2O_4∶Eu^(2+),Dy^(3+)的制备及发光性能研究

Preparation and Luminous Performances of SrAl_2O_4∶Eu^(2+),Dy^(3+) Luminous Materials

采用高温固相法,在碳粉还原条件下制备了发光亮度高、余辉时间长的SrAl2O4∶Eu2+,Dy3+长余辉发光材料,对其发光性能进行了研究。发光粉体经碳粉还原后的发射光谱表明,其发射主峰位于509 nm左右;余辉衰减曲线证明其余辉衰减过程存在快速衰减和慢衰减两个过程,该发光粉体的余辉时间能持续20 h以上。此外还考察了烧结温度、稀土掺杂量和助熔剂含量对此发光粉体发光性能的影响。

The SrAl2O4：Eu^2＋,Dy^3＋ luminous materials with high brightness and long persistence have been synthesized by solid sintering technology using carbon as reductant. The factors that influence the luminous performances and preparation technology have been discussed. These luminous materials exhibit broadband peaks in both excitation and emission spectra. The excitation peaks are between 275 and 420 nm, and the main emission peaks are around 509 nm. The results indicate that the luminescence of these materials are due to 4f7 （^8S7/2）-4f65d transition of Eu^2＋. Additionally, the long persistence of the SrAl2O4：Eu^2＋,Dy^3＋ luminous materials can persist over 20 h. The effects of such factors as the temperature in the sintering process, different proportions of Eu and Dy, and different additions of boric acid on the luminous intensities have been searched into.