Bi离子掺杂GeO_2-Al_2O_3-M(M=Na_2O,BaO,Y_2O_3)玻璃的光学性质  

Properties of Bi doped Al_2O_3-GeO_2-M (M=Na_2O, BaO, Y_2O_3)glasses

作　　者：王雪俊[1] 夏海平[1] 

机构地区：[1]宁波大学光电子功能材料研究所,宁波315211

出　　处：《物理学报》2006年第10期5263-5267,共5页Acta Physica Sinica

基　　金：浙江省自然科学基金(批准号:502164);宁波市博士基金(批准号:2005A610010)资助的课题.~~

摘　　要：用高温熔融法制备了Bi离子掺杂浓度为1mol%的GeO-B2O3-Na2O(GBNB),GeO2-Al2O3-Na2O(GANB),GeO2-Al2O3-BaO(GABB)和GeO2-Al2O3-Y2O3(GAYB)玻璃.测定了样品玻璃的差热曲线、吸收、发射光谱及荧光衰减曲线.实验发现GBNB,GANB,GAYB,GABB的吸收边带逐步发生红移.由于这些吸收边带是由Bi3+的6s2电子到Bi5+6s0空轨道的跃迁引起.因此推断GBNB,GANB,GAYB,GABB玻璃中Bi5+离子的含量逐步增加.在GABB,GAYB,GANB三个样品中观察到发光中心约1220nm超宽带荧光发射.荧光强度从GABB,GAYB,GANB逐步减弱,荧光半高宽和荧光寿命逐步变小.这些超宽带的荧光归属为Bi5+离子的发光所致.从吸收与荧光光谱的变化,推断在GeO2-Al2O3玻璃中引入BaO,Y2O3组分有利于Bi5+离子的形成.讨论了BaO,Y2O3化学组分对Bi离子在玻璃中的价态影响的内在机理.The GeO-B2O3-Na2O （ GBNB）, GeO2-Al2O3-Na2O（ GANB）, GeO2-Al2O3-BaO（GABB） and GeO2-Al2O3-Y2O3 （GAYB） glasses doped with bismuth of 1mol% concentration were prepared by melting method and measurement of their DTA curves, absorption and emission spectra and fluorescence decay curves were carried out. It was found that the absorption edges of GBNB, GANB, GAYB, GABB were red-shifted. Since the absorption edges are ascribed to the charge transfer transition from Bi^3＋ 6s^2 to Bi^5＋ 6s^0 , we conclude that the content of Bi^5＋ in GBNB, GANB, GAYB, and GABB glasses increased gradually. Near infrared super-broadband emission of GANB, GABB and GAYB samples were observed to be center-peaked at～1220nm. The fluorescence intensity, FWHM and emission lifetime of GABB, GAYB, GANB were reduced gradually. The super-broadband emissions may be due to the formation and fluorescence of Bi^5＋ . It could be deduced from the absorption and emission spectra that the introductions of BaO and Y2O3 into GeO2 -Al2O3 glass were advantageous to the formation of Bi^5＋ in the glass. The mechanism of BaO and Y2O3 composition affecting the formation of Bi^5＋ in the GeO2-Al2O3 glass is discussed.

关 键 词：Bi^5+离子 超宽带发光 吸收带 荧光寿命 

分 类 号：O482.3[理学—固体物理]