Size-independent peak shift between normal and upconversion photoluminescence in MPA-capped CdTe nanoparticles |
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| Authors: | S ANANTHAKUMAR J JAYABALAN ASHA SINGH SALAHUDDIN KHAN SUBHASH PRAJAPATI S MOORTHY BABU RAMA CHARI |
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| Affiliation: | 1. Crystal Growth Centre, Anna University, Chennai, 600 025, India
2. Laser Physics Applications Section, Raja Ramanna Centre for Advanced Technology, Indore, 452 013, India
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| 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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