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)
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
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.
Received: 15 August 2006
Revised: 10 November 2006
Accepted manuscript online:
(Amorphous materials; glasses and other disordered solids)
Fund: 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
Cite this article:
Li Tao(李涛), Zhang Qin-Yuan(张勤远), and Jiang Zhong-Hong(姜中宏) Laser-diode excited intense upconversion luminescence of Er3+ in bismuth--lead--germanate glasses 2007 Chinese Physics 16 1155
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