Showing papers by "Eitan Ehrenfreund published in 2003"
TL;DR: Linear and nonlinear recombination kinetics with various lifetime distributions were identified for long-lived photoexcitations in a series of pi-conjugated polymer films using modulation frequency and excitation intensity dependencies of the photoinduced absorption.
Abstract: (Received 21 July 2002; published 28 January 2003)Linear and nonlinear recombination kinetics with various lifetime distributions were identified forlong-lived photoexcitations in a series of -conjugated polymer films using modulation frequency andexcitation intensity dependencies of the photoinduced absorption. This includes monomolecular,bimolecular, and defect-limited recombination processes that lead to saturation. Using generalizedkinetics parameters, we found characteristic plots for all recombination processes. Specifically, thebimolecular recombination process shows superlinear intensity dependence away from the steady state;on the contrary, dispersive bimolecular recombination leads to sublinear dependence.
36 citations
TL;DR: In this article, the authors examined the recombination kinetics for long-lived photoexcitations in a series of π-conjugated polymer films using modulation frequency and excitation intensity dependencies of the photoinduced absorption (PIA).
3 citations
TL;DR: In this paper, the authors reported the intensity and polarization correlations of two consecutively emitted photons from an optically excited single semiconductor quantum dot (SCQD) and observed a preferentially co-circularly-polarized cross-correlation at low excitation power, which is tentatively explained in terms of long electronic spin memory.
2 citations
TL;DR: In this article, the intensity auto-and cross-correlation functions of two consecutively emitted photons from an optically excited single semiconductor quantum dot were reported, and it was shown that a quantum dot is not only a source of non-classically correlated monochromatic photons but also a multicolor photon with excitation power dependent correlation properties.
1 citations
TL;DR: In this article, the authors report on picosecond time resolved spectroscopy of photogenerated infrared active vibrations in thin films of 2,5-dioctyloxy poly(phenylene vinylene).
1 citations
TL;DR: In this article, it was shown that there are tunable intensity and polarization correlations among photons emitted at the same, and at different wavelengths due to the recombination of electron-hole pairs from different collective many-carrier quantum states confined in the dots.
Abstract: We report on measurements of temporal and polarization correlations measurements of multi-color photons emitted from cw optically excited single semiconductor quantum dots. We show that there are tunable intensity and polarization correlations among photons emitted at the same, and at different wavelengths due to the recombination of electron-hole pairs from different collective many-carrier quantum states confined in the dots. The observed polarization correlations between the emitted photons are qualitatively explained in terms of long electronic spin memory.