SnO—BaO—P2O5系统无铅封接玻璃的结构与性质

以SnO—BaO—P2O5三元系统玻璃为研究对象,利用差示量热扫描分析仪、热膨胀仪、拉曼光谱仪,分析了玻璃的结构以及玻璃转变温度和热膨胀系数与玻璃组成的关系．获得了该体系玻璃的形成区域,测得该系统的玻璃转变温度为260～360℃和热膨胀系数为12～14×10^-6℃．研究发现,当P2O5=45mol％不变时,玻璃转变温度随着SnO含量的增加而降低;当BaO=10mol％不变时,玻璃转变温度随着SnO含量的增加先降低后升高．研究表明,该体系玻璃可以作为低温环保封接玻璃潜在的基质材料．     

溶胶-凝胶法制备CaAl_2SiO_6:Eu~(2+)荧光粉及其光学性质的研究

采用溶胶-凝胶法制备了CaAl2SiO6∶Eu2+荧光粉,利用X射线衍射仪、荧光光谱仪、热分析仪对其结构和光学性质进行了研究.结果表明,样品经1 000℃CaAl2SiO6∶Eu2+荧光粉在430 nm附近的发光峰为Eu2+中心的4f65d1(t2g)→4f7(8S7/2)跃迁;随Eu2+离子浓度的增加,样品的发光强度先增加后降低,在Eu2+浓度为0.7 mol%时达到最大;CaAl2SiO6∶Eu2+系列荧光粉的激发峰波长在280~390 nm之内,可以作为一种新型的UV-LED用三基色荧光粉.     

SnO-BaO-P2O5系统无铅封接

以SnO-BaO-P2O5三元系统玻璃为研究对象,利用差示量热扫描分析仪、热膨胀仪、拉曼光谱仪,分析了玻璃的结构以及玻璃转变温度和热膨胀系数与玻璃组成的关系.获得了该体系玻璃的形成区域,测得该系统的玻璃转变温度为260～360 ℃和热膨胀系数为12～14×10-6 ℃-1.研究发现,当P2O5=45 mol%不变时,玻璃转变温度随着SnO含量的增加而降低;当BaO=10 mol%不变时,玻璃转变温度随着SnO含量的增加先降低后升高.研究表明,该体系玻璃可以作为低温环保封接玻璃潜在的基质材料.     

Effect of fluxes on structure and luminescence properties of Y3Al5O12：Ce^3＋ phosphors

Ce3+-activated yttrium aluminum garnet (YAG) was prepared by the solid-state reaction, in which H3BO3, LiF, NaF, KF and BaF2 were used as the fluxes. The effect of fluxes on optical properties of phosphors was studied in detail, especially the fluxes of alkali fluorides, which could enhance the emission intensity and change the wavelength of emission peaks. Among these YAG:Ce phosphors, the phosphor sintered with H3BO3 and NaF exhibited the strongest emission. The emission peaks of phosphors prepared with fluxes from LiF to KF were shifted to long wavelength. The effect of NaF concentration on the emission intensity of YAG:Ce was also investigated. The value of emis-sion intensity reached the maximum when the concentration of NaF was 0.5%.