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Optical parameters of Nd3+:Er3+:Yb3+ co-doped borosilicate glasses and their energy transfers at high temperature |
Li Cheng-Ren(李成仁)a)†, Li Shu-Feng(李淑凤) b), Dong Bin(董斌)c), Cheng Yu-Qi(程宇琪)a), Yin Hai-Tao(殷海涛)a), Yang Jing(杨静)a), and Chen Yu(陈宇)a) |
a College of Physics and Electronic Technology, Liaoning Normal University, Dalian 116029, China; b School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China; c School of Science, Dalian Nationalities University, Dalian 116600, China |
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Abstract This paper reports that a series of Nd3+:Er3+:Yb3+ co-doped borosilicate glasses have been prepared and their absorption spectra measured. The J–O intensity parameters Ωk (k=2, 4, 6), spontaneous radiative lifetime τrad, spontaneous transition probability A, fluorescence branching ratio β and oscillator strength fed of the Nd3+ ions at room temperature are calculated based on Judd–Ofelt (J–O) theory. The temperature dependence of the up-conversion photoluminescence characteristics in a Nd3+:Er3+:Yb3+ co-doped sample is studied under a 978 nm semiconductor laser excitation, and the energy transfer mechanisms among Yb3+, Er3+ and Nd3+ ions are analysed. The results show that the J–O intensity parameters Ω2 increase when the Nd3+ concentration of the Nd3+:Er3+:Yb3+ co-doped borosilicate glasses increases. The possibility of spontaneous transition is small and lifetimes are long at levels of 4F5/2 and 4F3/2. The intensity of Nd3+ emissions at 595, 691, 753, 813 and 887 nm are markedly enhanced when the sample temperature exceeds 400 K. The reasons being the cooperation of the secondary sensitization from Er3+ to Nd3+ and the contribution of a multi-phonon.
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Received: 08 June 2010
Revised: 20 July 2010
Accepted manuscript online:
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PACS:
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78.55.Qr
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(Amorphous materials; glasses and other disordered solids)
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38.80.Wr
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 10804015) and the Education Department of Liaoning Province, China (Grant No. 2009A417). |
Cite this article:
Li Cheng-Ren(李成仁), Li Shu-Feng(李淑凤), Dong Bin(董斌), Cheng Yu-Qi(程宇琪), Yin Hai-Tao(殷海涛), Yang Jing(杨静), and Chen Yu(陈宇) Optical parameters of Nd3+:Er3+:Yb3+ co-doped borosilicate glasses and their energy transfers at high temperature 2011 Chin. Phys. B 20 017803
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