银纳米颗粒对Tm^(3+)/Yb^(3+)共掺铋锗酸盐玻璃上转换发光性能的影响  

Influence of Silver Nanoparticles on the Upconversion Properties in Tm^(3+)/Yb^(3+) Codoped Bismuth Germanate Glasses

作　　者：吴一[1] 徐铁峰[1] 沈祥[1] 戴世勋[1] 聂秋华[1] 王训四[1] 宋宝安[1] 张巍[1] 林常规[1] 

机构地区：[1]宁波大学信息科学与工程学院,浙江宁波315211

出　　处：《光学学报》2011年第7期264-268,共5页Acta Optica Sinica

基　　金：国家自然科学基金(60878042);中国博士后基金(20080430204);浙江省大学生科技创新活动计划(2010R405065);宁波大学研究生科研创新基金(G10JA004)资助课题

摘　　要：利用传统熔融淬冷法制备了系列Tm3+/Yb3+共掺复合银纳米颗粒铋锗酸盐玻璃样品。测试得到表征银纳米颗粒存在的表面等离子体共振(SPR)峰位于556～581 nm,透射电镜图像中观察到均匀分布的Ag纳米颗粒,尺寸约为5～25 nm。通过测试玻璃样品在400～900 nm波段的上转换光谱,对铥镱共掺复合银纳米颗粒铋锗酸盐玻璃的上转换发光机制进行了探讨。结果表明,由于银纳米颗粒表面等离子体共振导致的局域场增强以及Ag0→Tm3+的能量转移,Tm3+离子476 nm处的上转换蓝光(1G4→3H6)、649 nm处的上转换红光(1G4→3F4)和801 nm处的近红外光(3H4→3H6)在AgCl掺杂质量分数为0.2%时达到最大值,与未掺杂AgCl的样品相比,分别提高了约18.1,8.3,6.4倍。The Tm3＋/Yb3＋ codoped bismuth germanate glass substrates containing metal Ag nanoparticles（NPs） were synthesized by the conventional melting-quenching technique.The absorption band related to the surface plasmon resonance（SPR） of the silver NPs is located from 556 to 581 nm.Transmission electron microscopic image clearly reveals homogeneously dispersed Ag NPs with the size from 5 to 25 nm.The upconversion luminescence spectra in the range of 400~900 nm are measured.The upconversion mechanism of Tm3＋/Yb3＋ codoped bismuth germanate glass is also discussed.Upconversion luminescence exhibits three main emission bands of Tm3＋ ions centered at 476 nm（blue）,649 nm（red） and 801 nm（near-infrared） due to 1G4→3H6,1G4→3F4,3H4→3H6 transitions,respectively.With the addition of the AgCl up to mass fraction of 0.2%,the intensities of these emission bands increase by 18.1,8.3 and 6.4 folds,respectively.The enhancement of upconversion emission is attributed to the enhanced local field induced by Ag0 SPR and energy transfer from Ag0 to Tm3＋ ions.

关 键 词：光谱学 铋锗酸盐玻璃 表面等离子体共振 Tm^3+/Yb^3+共掺 银 

分 类 号：TQ171[化学工程—玻璃工业]