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Sensitizing effect of Yb3+ on near-infrared fluorescence emission of Cr4+-doped calcium aluminate glasses

Published online by Cambridge University Press:  31 January 2011

Yong Gyu Choi ,
Kyong Hon Kim ,
Yong Seop Han  and
Jong Heo
Yong Gyu Choi*
Affiliation:
Telecommunication Basic Research Laboratory, Electronics and Telecommunications Research Institute (ETRI), Yusong P.O. Box 106, Taejon 305-600, Korea
Kyong Hon Kim
Affiliation:
Telecommunication Basic Research Laboratory, Electronics and Telecommunications Research Institute (ETRI), Yusong P.O. Box 106, Taejon 305-600, Korea
Yong Seop Han
Affiliation:
Photonic Glasses Laboratory, Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-dong, Nam-gu, Pohang, Kyungbuk 790-784, Korea
Jong Heo
Affiliation:
Photonic Glasses Laboratory, Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), San 31, Hyoja-dong, Nam-gu, Pohang, Kyungbuk 790-784, Korea
*
a)Address all correspondence to this author.
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Abstract

We have demonstrated that an efficient energy transfer takes place from Yb3+ to Cr4+ in calcium aluminate glasses. Yb3+ improves excitation efficiency at around 980 nm, enhancing emission intensity of Cr4+ fluorescence at 1.2–1.6 μm. Nonradiative energy transfer via electric dipole–dipole interaction between ytterbium and chromium ions was found to be dominant over radiative Yb3+ → Cr4+ energy transfer. A diffusionlimited energy transfer mechanism well explains the decay behavior of Yb3+/Cr4+- codoped glasses. This codoping scheme may be applicable to other Cr4+-containing crystals and glasses.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 2 , February 2000 , pp. 278 - 281
Copyright
Copyright © Materials Research Society 2000

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References

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