Size-independent peak shift between normal and upconversion photoluminescence in MPA-capped CdTe nanoparticles

作者：Ananthakumar S; Jayabalan J^*; Singh Asha; Khan Salahuddin; Prajapati Subhash; Babu S Moorthy; Chari Rama

来源：Pramana - Journal of Physics, 2014, 82(2): 353-358.

DOI：10.1007/s12043-014-0689-6

• Upconversion photoluminescence
• CdTe nanoparticles
• femtosecond laser

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.

• 出版日期2014-2