中国物理B ›› 2007, Vol. 16 ›› Issue (4): 1155-1158.doi: 10.1088/1009-1963/16/4/050

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Laser-diode excited intense upconversion luminescence of Er3+ in bismuth--lead--germanate glasses

李涛1, 张勤远2, 姜中宏2   

  1. (1)College of Science, South China Agriculture University, Guangzhou 510640, China; (2)Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology, Ministry of Education, Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China
  • 收稿日期:2006-08-15 修回日期:2006-11-10 出版日期:2007-04-20 发布日期:2007-04-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 50472053), the Programme for New-Century Excellent Talents in Universities of Ministry of Education, China (Grant No NCET-04-0823) and the Natural Science Foundation of Guangd

Laser-diode excited intense upconversion luminescence of Er3+ in bismuth--lead--germanate glasses

Li Tao(李涛)a)†, Zhang Qin-Yuan(张勤远)b)†, and Jiang Zhong-Hong(姜中宏)b)   

  1. a College of Science, South China Agriculture University, Guangzhou 510640, China; b Key Laboratory of Specially Functional Materials and Advanced Manufacturing Technology, Ministry of Education, Institute of Optical Communication Materials, South China University of Technology, Guangzhou 510640, China
  • Received:2006-08-15 Revised:2006-11-10 Online:2007-04-20 Published:2007-04-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 50472053), the Programme for New-Century Excellent Talents in Universities of Ministry of Education, China (Grant No NCET-04-0823) and the Natural Science Foundation of Guangd

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摘要： We have investigated infrared-to-visible upconversion luminescence of Er3+ in bismuth--lead--germanate glasses. The UV cutoff wavelength is shortened while its lifetime is increased almost linearly, with PbF2 substituting for PbO in the bismuth--lead--germanate glasses. Three emissions centred at around 529, 545 and 657nm are clearly observed, which are identified as originating from the 2H11/2\rightarrow ^4{\rm I15/2, 4S3/2\rightarrow 4I15/2 and 4 F9/2\rightarrow 4I15/2 transitions, respectively. It is noted that all the upconversion emission intensities increase with PbF2 concentration increasing. The ratio between the intensities of red and green emissions increases with the increasing of PbF2 content. Energy transfer processes and nonradiative phonon-assisted decays account for the populations of the 2H11/2,4 S3/2 and 4F9/2 levels. The quadratic dependence of fluorescence on excitation laser power confirms a two-photon process to contribute to the upconversion emissions.

关键词: upconversion, luminescence, Er3+, bismuth--lead--germanate glasses

Abstract: We have investigated infrared-to-visible upconversion luminescence of Er3+ in bismuth--lead--germanate glasses. The UV cutoff wavelength is shortened while its lifetime is increased almost linearly, with PbF2 substituting for PbO in the bismuth--lead--germanate glasses. Three emissions centred at around 529, 545 and 657nm are clearly observed, which are identified as originating from the 2H11/2$\rightarrow$ 4I15/2, 4S3/2$\rightarrow$ 4I15/2 and 4 F9/2$\rightarrow$4I15/2 transitions, respectively. It is noted that all the upconversion emission intensities increase with PbF2 concentration increasing. The ratio between the intensities of red and green emissions increases with the increasing of PbF2 content. Energy transfer processes and nonradiative phonon-assisted decays account for the populations of the 2H11/2,4 S3/2 and 4F9/2 levels. The quadratic dependence of fluorescence on excitation laser power confirms a two-photon process to contribute to the upconversion emissions.

Key words: upconversion, luminescence, Er3+, bismuth--lead--germanate glasses

中图分类号:  (Semiconductor lasers; laser diodes)

  • 42.55.Px
42.70.Ce (Glasses, quartz) 78.55.Qr (Amorphous materials; glasses and other disordered solids)