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无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

金红石TiO2基质中[MoO4]2-基团的上转换发光

吴长锋; 秦伟平; 秦冠仕; 赵丹; 张继森   

  1. 国科学院长春光学精密机械与物理研究所激发态物理重点实验室 长春 130022
  • 收稿日期:2002-04-19 修回日期:2002-07-17 出版日期:2003-05-20 网络出版日期:2003-05-20

Near-Infrared-to-Visible Photon Upconversion of [MoO4]2- Complexes Doped in Rutile Titania

WU Chang-Feng; QIN Wei-Ping; QIN Guan-Shi; ZHAO Dan; ZhANG Ji-Sen   

  1. Key Laboratory of Excited State Processes; Changchun Institute of Optics; Fine Mechanics and Physics; Chinese Academy of Sciences; Changchun 130022; China
  • Received:2002-04-19 Revised:2002-07-17 Published:2003-05-20 Online:2003-05-20

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摘要： 在978nm激光二极管的激发下,Mo掺杂的TiO2材料表现出很强的宽带上转换发光,该发光来源于[MoO4]2-基团的激发态3T1,3T2能级到基态1A1能级的电子跃迁,X射线衍射表明样品为金红石单一相,红外吸收光谱证实了[MoO4]2-的存在,由光电子能谱推测体系中还含有低价态的Mo离子,它们提供了上转换得以进行的中间态,高温下的氧化还原处理会改变低价Mo的数量,从而严重影响样品的发光行为。

关键词: 上转换, TiO2, [MoO4]2-

Abstract: Mo-doped titania excited by a 978nm diode laser exhibits a visible broadband emission which can be controlled by high-temperature chemical redox. The
luminescence has been assigned to the transitions from the excited states 3T1, 3T2 to the ground state 1A1 of the [MoO4]2- radicle. FTIR spectrum
confirms the presence of the [MoO4]2- complexes, while XPS measurement suggests the concurrent existence of lower valent Mo species. The intermediate states
available for upconversion are supposed to be related to the lower valent Mo species through which the external chemical redox modifies the luminescence.

Key words: upconversion, TiO2, [MoO4]2-

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