Abstract

The current search for efficient upconversion (UC) materials is driven by numerous potential applications; one of them is solar cell efficiency improvement. The data on the absolute UC efficiency of materials are of extreme importance for estimation of real feasibility of approaches suggested for applications; however, these data have been reported only for a few materials. In [1], an indirect method of evaluation of the significance of upconversion materials for solar cells is proposed. We discuss this method and support our considerations by the results of experimental measurements of the absolute UC efficiency of Er-doped modified ZBLAN glass.

© 2010 Optical Society of America

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References

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  1. M. Liao, G. Qin, X. Yan, M. Hughes, T. Suzuki, and Y. Ohishi, “Comments on evaluating upconversion materials developed to improve the efficiency of solar cells,” J. Opt. Soc. Am. B 27, to be published.
  2. M. Pollnau, D. R. Gamelin, S. R. Lüthi, H. U. Güdel, and M. P. Hehlen, “Power dependence of upconversion luminescence in lanthanide and transition-metal-ion systems,” Phys. Rev. B 61, 3337–3346 (2000).
    [CrossRef]
  3. S. Ivanova and F. Pellé, “Strong 1.53 μm to NIR-VIS-UV upconversion in Er-doped fluoride glass for high-efficiency solar cells,” J. Opt. Soc. Am. B 26, 1930–1938 (2009).
    [CrossRef]

2009

2000

M. Pollnau, D. R. Gamelin, S. R. Lüthi, H. U. Güdel, and M. P. Hehlen, “Power dependence of upconversion luminescence in lanthanide and transition-metal-ion systems,” Phys. Rev. B 61, 3337–3346 (2000).
[CrossRef]

Gamelin, D. R.

M. Pollnau, D. R. Gamelin, S. R. Lüthi, H. U. Güdel, and M. P. Hehlen, “Power dependence of upconversion luminescence in lanthanide and transition-metal-ion systems,” Phys. Rev. B 61, 3337–3346 (2000).
[CrossRef]

Güdel, H. U.

M. Pollnau, D. R. Gamelin, S. R. Lüthi, H. U. Güdel, and M. P. Hehlen, “Power dependence of upconversion luminescence in lanthanide and transition-metal-ion systems,” Phys. Rev. B 61, 3337–3346 (2000).
[CrossRef]

Hehlen, M. P.

M. Pollnau, D. R. Gamelin, S. R. Lüthi, H. U. Güdel, and M. P. Hehlen, “Power dependence of upconversion luminescence in lanthanide and transition-metal-ion systems,” Phys. Rev. B 61, 3337–3346 (2000).
[CrossRef]

Hughes, M.

M. Liao, G. Qin, X. Yan, M. Hughes, T. Suzuki, and Y. Ohishi, “Comments on evaluating upconversion materials developed to improve the efficiency of solar cells,” J. Opt. Soc. Am. B 27, to be published.

Ivanova, S.

Liao, M.

M. Liao, G. Qin, X. Yan, M. Hughes, T. Suzuki, and Y. Ohishi, “Comments on evaluating upconversion materials developed to improve the efficiency of solar cells,” J. Opt. Soc. Am. B 27, to be published.

Lüthi, S. R.

M. Pollnau, D. R. Gamelin, S. R. Lüthi, H. U. Güdel, and M. P. Hehlen, “Power dependence of upconversion luminescence in lanthanide and transition-metal-ion systems,” Phys. Rev. B 61, 3337–3346 (2000).
[CrossRef]

Ohishi, Y.

M. Liao, G. Qin, X. Yan, M. Hughes, T. Suzuki, and Y. Ohishi, “Comments on evaluating upconversion materials developed to improve the efficiency of solar cells,” J. Opt. Soc. Am. B 27, to be published.

Pellé, F.

Pollnau, M.

M. Pollnau, D. R. Gamelin, S. R. Lüthi, H. U. Güdel, and M. P. Hehlen, “Power dependence of upconversion luminescence in lanthanide and transition-metal-ion systems,” Phys. Rev. B 61, 3337–3346 (2000).
[CrossRef]

Qin, G.

M. Liao, G. Qin, X. Yan, M. Hughes, T. Suzuki, and Y. Ohishi, “Comments on evaluating upconversion materials developed to improve the efficiency of solar cells,” J. Opt. Soc. Am. B 27, to be published.

Suzuki, T.

M. Liao, G. Qin, X. Yan, M. Hughes, T. Suzuki, and Y. Ohishi, “Comments on evaluating upconversion materials developed to improve the efficiency of solar cells,” J. Opt. Soc. Am. B 27, to be published.

Yan, X.

M. Liao, G. Qin, X. Yan, M. Hughes, T. Suzuki, and Y. Ohishi, “Comments on evaluating upconversion materials developed to improve the efficiency of solar cells,” J. Opt. Soc. Am. B 27, to be published.

J. Opt. Soc. Am. B

M. Liao, G. Qin, X. Yan, M. Hughes, T. Suzuki, and Y. Ohishi, “Comments on evaluating upconversion materials developed to improve the efficiency of solar cells,” J. Opt. Soc. Am. B 27, to be published.

S. Ivanova and F. Pellé, “Strong 1.53 μm to NIR-VIS-UV upconversion in Er-doped fluoride glass for high-efficiency solar cells,” J. Opt. Soc. Am. B 26, 1930–1938 (2009).
[CrossRef]

Phys. Rev. B

M. Pollnau, D. R. Gamelin, S. R. Lüthi, H. U. Güdel, and M. P. Hehlen, “Power dependence of upconversion luminescence in lanthanide and transition-metal-ion systems,” Phys. Rev. B 61, 3337–3346 (2000).
[CrossRef]

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Figures (2)

Fig. 1
Fig. 1

The power of upconversion luminescence near 0.98 μ m corresponding to the I 11 2 4 I 15 2 4 transition as a function of pump power density for the Er-doped modified ZBLAN glass Z18Er5%. Excitation at 1.53 μ m by a CW Er fiber laser. Circles: experimental data. Dashed curve 1: fit using the formula P UC = k ( P pump ) 2 , where k = 2.4 10 3 cm 2 W (limiting case of low pump power densities). Dashed curve 2: fit using the formula P UC = k P pump , where k = 0.034 (limiting case of high pump power densities).

Fig. 2
Fig. 2

The absolute efficiency of upconversion luminescence near 0.98 μ m corresponding to the I 11 2 4 I 15 2 4 transition as a function of pump power density for the Er-doped modified ZBLAN glass Z18Er5% (the synthesis and composition are described in [3]). Excitation at 1.53 μ m by a CW Er fiber laser. Circles: experimental data. Dashed curve 1: fit using the formula η UC = k ( P pump ) n (n < 1, case of low pump power densities). Dashed curve 2: fit using the formula η UC = Constant = 11.5 % (limiting case of high pump power densities).

Equations (4)

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P uc = k ( P pump ) n ,
I lim = N d h c λ A .
S = π ( NA L ) 2 .
P pump = P S = P ( π ( NA L ) 2 ) .

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