Abstract
In this article, we report size-dependent measurement of the shift in peak of upconversion photoluminescence spectra compared to that of normal photoluminescence using a 800 nm femtosecond laser and its second harmonic. It has been shown that the upconversion photoluminescence is always red-shifted compared to that of normal PL in all the samples. By measuring the power-dependent upconversion photoluminescence (UCPL), it has been shown that the origin of UCPL from MPA-capped CdTe nanoparticles is mainly of two-photon absorption
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Acknowledgements
The authors acknowledge the support and encouragement of Dr H S Rawat, Head, LPAS during the course of this work. The authors sincerely thank UGC, Govt. of India (F. No. 42-885/2013 (SR)) for funding the research. One of the authors S. Ananthakumar acknowledges Ministry of New and Renewable Energy (MNRE), Govt. of India for providing fellowship under National Renewable Energy Fellowship (NREF) Scheme.
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ANANTHAKUMAR, S., JAYABALAN, J., SINGH, A. et al. Size-independent peak shift between normal and upconversion photoluminescence in MPA-capped CdTe nanoparticles. Pramana - J Phys 82, 353–358 (2014). https://doi.org/10.1007/s12043-014-0689-6
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DOI: https://doi.org/10.1007/s12043-014-0689-6