长余辉材料Sr_2MgSi_2O_7∶Eu^(2+),Dy^(3+)的制备及发光性能研究

Preparation Technology of Sr_2MgSi_2O_7∶Eu^(2+),Dy^(3+) Luminous Materials and Their Luminous Performance

在碳粉还原条件下,采用高温固相法制备出了亮度高、余辉时间长的Sr2MgSi2O7∶Eu2+,Dy3+长余辉发光材料,并对其性能以及影响其发光性能的因素进行了研究。发光粉体还原后的发射光谱表明,其主发射峰位于463 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。

The Sr2MgSi2O7∶Eu2+,Dy3+ luminous materials were synthesized by solid sintering technology at the presence of carbon as reductant.The factors that influence the luminous performance and preparation technology were discussed.These luminous materials exhibited broadband peaks in both the excitation and emission spectra.The excitation peaks lied between 220 and 450 nm,and the main emission peaks lied around 463 nm.The results indicate that the luminescence of these materials are due to 4f7(8S7/2)-4f65d transition of Eu2+.Additionally,the long afterglow of the Sr2MgSi2O7∶Eu2+,Dy3+ luminous materials can last over 10 h in the light perception of the human eye.Its luminescence decay consisted of the initial fast process and the later extremely slow process.Effects of such factors as the temperature in the sintering process,different proportions of Eu/Dy and different additions of boracic acid on the relative luminescent intensity were studied.