蓝色发光材料Sr_2MgSi_2O_7∶Eu^(2+),Dy^(3+)的微波合成及性能

Microwave Synthesis of Blue Luminescence Material of Sr_2MgSi_2O_7∶Eu^(2+),Dy^(3+) and Its Properties

采用微波辐射法合成了Sr2MgSi2O7∶Eu2+,Dy3+粉末,研究了微波辐射功率和加热时间对制备Sr2Mg-Si2O7∶Eu2+,Dy3+的影响,确定了微波法合成Sr2MgSi2O7∶Eu2+,Dy3+的最佳条件,并用x射线衍射(XRD)、荧光光谱等测试手段对其进行了表征。XRD结果表明,合成的Sr2MgSi2O7∶Eu2+,Dy3+属于四方晶系。荧光光谱测试表明,用lem=467nm作为监控波长,在200nm^450nm之间有宽的激发光谱,峰值位于398nm。用lex=398nm激发样品,其发射光谱为一宽带,峰值位于467nm。Sr2MgSi2O7∶Eu2+,Dy3+的荧光强度和余辉性能随辐射功率和时间的不同而发生变化,其中以辐射功率720W,反应时间25min时荧光强度最强,余辉时间可达8h。

The blue emission Sr2 MgSi2 O7： Eu^2＋ , Dy^3＋ phosphor powders were prepared using a hybrid microwave synthesis. The influence of different microwave radiation power and heating time on Sr2 MgSi2 07： Eu^2 ＋ , Dy^3＋ was discussed and the optimum condition to achieve superior Sr2 MgSi2 O7： Eu^2＋ , Dy^3＋ phosphor is confirmed. The powders were characterized by X - ray diffraction （XRD） and photoluminescence spectra. The results show that the Sr2MgSi2O7： Eu^2＋ , Dy^3＋ bulk powders exhibited a tetragonal crystal structure. The excitation spectrum （λem = 467nm ） and emission spectrum （λex = 398nm ） of Sr2 MgSi2 O7： Eu^2＋ , Dy^3＋ are broad band spectra, and the main excitation peaking at 398nm. The main emission peaking at 467nm is ascribed to the 4f- 5d transition of Eu^2＋. The emission intensity and afterglow property of Sr2 MgSi2O7： Eu^2＋ , Dy^3＋ phosphor change with different power and time ,and the strongest emission intensity is at 720W for 25min. The duration time lasted over 8 h.