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Enhanced visible to near-infrared quantum cutting in Tb and Yb co-doped oxyfluoride glass-ceramic

Published online by Cambridge University Press:  22 August 2012

Z. Pan ,
G. Sekar ,
R. Akrobetu ,
R. Mu  and
S. H. Morgan
Z. Pan*
Affiliation:
Department of Physics, Fisk University, Nashville, TN 37208, U.S.A.
G. Sekar
Affiliation:
Department of Physics, Fisk University, Nashville, TN 37208, U.S.A.
R. Akrobetu
Affiliation:
Department of Physics, Fisk University, Nashville, TN 37208, U.S.A.
R. Mu
Affiliation:
Department of Physics, Fisk University, Nashville, TN 37208, U.S.A.
S. H. Morgan
Affiliation:
Department of Physics, Fisk University, Nashville, TN 37208, U.S.A.
*
*Email: zpan@fisk.edu
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Abstract

Tb and Yb co-doped oxyfluoride glasses were fabricated in a lithium-lanthanum-aluminosilicate matrix by a melt-quench technique. Glass-ceramics were obtained by appropriate heat treatment of the as-prepared glasses. Visible to near-infrared down-conversion quantum cutting was studied for samples with different thermal annealing temperatures and time. Laser light at 488 nm was used to excite Tb3+ ions while Yb3+ ions were excited by energy transfer from the excited Tb3+ ions. Near-infrared emission at 940 – 1020 nm was observed. It has been found that the emission at 940 – 1020 nm increased significantly from the glass-ceramic compared to that of the as-prepared glass. This result suggests that the energy-transfer efficiency increases in glass-ceramics compared to that in glass. A significant portion of rare-earth ions may be incorporated inside LaF3 nanoparticles (NPs) in the glass-ceramic. Because the Yb3+ emission at 940 – 1020 nm is matched well with the band gap of crystalline Si, the quantum cutting effect may have its potential application in silicon-based solar cells.

Keywords

luminescenceTbYb
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1471: Symposium YY – Rare-Earth-Based Materials , 2012 , mrss12-1471-yy08-18
Copyright
Copyright © Materials Research Society 2012

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References

REFERENCES

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