Eu,Dy共掺铝硼硅酸盐的长余辉发光玻璃

选择铝硼硅酸盐玻璃体系,高温熔融法制备了Eu,Dy掺杂的铝硼硅酸盐基质透明的玻璃,并对其进行了激发光谱和发射光谱的表征分析。实验结果表明：在空气气氛条件下制备的Eu^3＋,Dy^3＋掺杂的铝硼硅酸盐基质玻璃样品并不具备长余辉发光特性;而经过还原气氛处理后,Eu离子以二价形式存在,样品具有长余辉发光现象。其激发光谱是位于250-450nm的宽带谱,发光光谱峰值位于462nm处。     

硅酸铋(BSO)纳米粉体的制备与表征

Bismuth silicate nanopowders were prepared by the sol-gel method. Tetraethyl orthosilicate (TEOS) and Bi₂O₃ were used as the starting materials. The precursors were heat-treated at 750℃ for 2 h. The size distribution of Bi₄Si₃O₁₂ nanopowders is 40～100 nm. The TG-DTA curves, the XRD patterns and the TEM microphotograph of Bi₄Si₃O₁₂ are discussed. Compared with crystal materials, the excitation spectra and the emission spectra of Bi₄Si₃O₁₂ nanopowders indicate blue shift.     

稀土掺杂长余辉发光玻璃的研究

分别采用空气气氛和还原气氛,制备了稀土Eu₂O₃,Dy₂O₃掺杂的铝硅酸盐玻璃,利用荧光光谱仪对样品进行了测试。结果表明：空气气氛条件下制备的铝硅酸盐玻璃样品均不具备长余辉发光性能, 其激发光谱和发光光谱均是Eu3+的5D_i(i=0, 1)→7F_j(j=0～4)跃迁的典型光谱。经还原气氛处理后,单掺和双掺的铝硅酸盐玻璃样品均具有长余辉发光现象,单掺Eu2+的发光峰位于462 nm,而双掺Eu2+和Dy3+的发光峰位于457 nm,且双掺Eu2+和Dy3+的样品陷阱能级较深,样品的发光持续时间长达12 h以上。