Surface recombination and charged exciton in nanocrystal quantum dots on photonic crystals under two-photon excitation

• DOI: 10.1038/srep05039
• Publication Date: 2014-06-06T09:18:28Z
• Authors: Xingsheng Xu
• Keywords: Biexciton; Auger effect; Photon Upconversion

In this study, the two-photon excited fluorescence spectra from cadmium selenide quantum dots (QDs) on a silicon nitride photonic crystal (PhC) membrane under femtosecond laser irradiation were investigated. These can be fit to tri-Gaussian function in which one component is negative amplitude, and Gaussian components with positive amplitude are assigned exciton emission charged-exciton that absorption surface recombination. The enhance and, at same time, also Both recombination related Auger recombination; therefore, controls both radiative non-radiative asymmetries of due not only location resonant guide mode PhC slab but enhancement by PhC.