Eu3+掺杂Bi2O3-PbO-B2O3-ZnO玻璃光谱性质

用高温融熔法制备了Eu³⁺掺杂浓度为1%的(60-x)Bi₂O₃xPbO30B₂O₃10ZnO(x=0,10,30,摩尔分数)玻璃.测定了玻璃的差热分析曲线、吸收光谱、声子边带谱、发射光谱与激发光谱.由发射光谱与稀土Eu³⁺离子光学跃迁矩阵元的特点,计算了Eu³⁺光学跃迁的J-O参数Ω₂与Ω₄.结果显示强度参数Ω₂随着PbO量的增加而略减少,表明材料的对称性略增加,Eu—O键强减弱,共价性降低.PbO组分的增加,使玻璃的结晶起始温度与软化温度差降低,导致玻璃的热温度性变差.随着PbO的增加,电-声子耦合减弱.

Optical Spectra of Bi2O3-PbO-B2O3-ZnO Glasses Doped with Eu3+ Ions

The Eu³⁺-doped glasses are well known as technologically important material and have been used widely in laser,luminescent material,and optical data storage.The glass doped with rare earth(RE)with wide emission band is very important for their application in wide band communication and other fields.The wide emission band of RE-doped in Bi-based glass is expected due to the high reflective index of Bi.The(60-x)Bi₂O₃xPbO30B₂O₃10ZnO(x=0,10,30,mol fraction)glasses doped with Eu³⁺ in 1% were fabricated by melting method.The emission situation of other rare earth ions can be reflected from that of Eu³⁺ in the glass due to the similar size of ionic diameter and chemical properties.The DTA curves,absorption,phonon side-band,emission and excitation spectra of the glasses were measured.The Ω₂ and Ω₄ parameters of Eu³⁺ for optical transition were calculated from their emission spectra in terms of reduced matrix U^λ(λ=2,4,6)character for optical transitions.The results indicated that the intensity parameters Ω₂ and Ω₄ decrease slightly as the increase of PbO contents.It suggests that the symmetry becomes higher,the band of Eu and O atoms becomes weaker and the covalency decreases slightly.The difference between glass transition temperature(T_g)and the crystallization onset temperature decreases as increase of PbO content,indicating that the thermal stability of the glass becomes worse.The electron-phonon coupling becomes weaker as increase of PbO content.