A novel exciton energy transfer-based ultrasensitive fluorescent sensing strategy for the detection of biological small molecules and protein has been established through split aptamer-programmed self-assembly of quantum dots (QDs). The signal is produced from exciton energy transfer of the self-assembled QDs. The recognition is accomplished using an aptamer sensor scaffold designed with two sp...

Excitons, Coulomb-bound electron–hole pairs, are the fundamental excitations governing optoelectronic properties of semiconductors. Although optical signatures excitons have been studied extensively, experimental access to excitonic wave function itself has elusive. Using multidimensional photoemission spectroscopy, we present a momentum-, energy-, and time-resolved perspective on in layered se...

This Abstract has been read for 18 times Abstract id: 422 Sorting Category: XII. Optical and optoelectronic properties We calculate optically-active (bright) and optically-inactive (dark) exciton energy of single wall carbon nanotubes (SWNTs). The bright and dark exciton energy of SWNTs is calculated by solving the Bethe-Salpeter equation in which the one particle energies are given by the exte...

The attraction between electrons and holes in semiconductors forms excitons, which largely determine the optical properties of the hosting material, and hence the device performance, especially for low-dimensional systems. Mono- and few-layer black phosphorus (BP) are emerging two-dimensional (2D) semiconductors. Despite its fundamental importance and technological interest, experimental invest...

Abstract So far in the literature terms “charged exciton” and “trion” are often confused with each other mostly considered as same. In this work we show is not case 2D quantum dots a parabolic confinement. By using unrestricted Hartree-Fock method energy binding of both charged excitons trions calculated dependence on confinements charge carriers dot. It shown that energies exciton trion behave...

We develop a consistent theory of the interlayer exciton-polaron formed in atomically thin bilayers. Coulomb attraction between an electron and hole situated different layers results their flexural deformation provides efficient mechanism exciton coupling with phonons. study effect tension on polaron binding energy effective mass leading to suppression formation by both weak strong regimes. als...

   Here, we report a theoretical detailed study of Vacuum Rabi Splitting (VRS) in the system of Nitride Single Quantum Well (SQW) within a semiconductor microcavity. Distributed Bragg Reflectors (DBRs) containing ZnTe/ZnSe multilayers including GaAs microcavity and  ( SQW at the center of microcavity, has been considered. Upper and lower exciton-polariton branches obtaine...

The photoluminescence (PL) and absorption experiments have been performed in GaSe slab with incident light polarized perpendicular to c-axis of sample at 10 K. An obvious energy difference of about 34 meV between exciton absorption peak and PL peak (the highest energy peak) is observed. By studying the temperature dependence of PL and absorption spectra, we attribute it to energy difference bet...

We investigate the nature of ultrafast exciton dissociation and carrier generation in acceptor-doped conjugated polymers. Using a combination of two-pulse femtosecond spectroscopy with photocurrent detection, we compare the exciton dissociation and geminate charge recombination dynamics in blends of two conjugated polymers, MeLPPP methyl-substituted ladder-type poly p-phenylene and MDMO-PPV pol...

We study the effects of hydrostatic pressure over the ground state binding energy of light hole excitons confined in GaAs − Ga1−xAlxAs spherical quantum dots. We applied the variational method using 1s-hydrogenic wavefunctions, in the framework of the effective mass approximation. We computed the exciton binding energy as a function of the dot radius, Al concentrations and pressures. Our result...