Linear and Nonlinear Excitonic Absorption and Photoluminescence Spectra in Cu2O: Line Shape Analysis and Exciton Drift
نویسندگان
چکیده
A complete analysis of the line shape of the excitonic absorption and photoluminescence lines of the yellow series of Cu2O is given. A detailed fit to the absorption lines up to the n 5 exciton according to Toyozawa's theory gives precise values for the excitonic resonance energies, allowing to calculate the excitonic Rydberg. The fit to the photoluminescence lines shows very good agreement with experimental data at different temperatures. At high excitation, the fit to the excitonic absorption lines reveals the fundamental mechanism for bleaching of exciton absorption lines in Cu2O. Based on these findings, a new all-optical method for the observation of exciton transport in Cu2O is proposed.
منابع مشابه
Structural and Optical Study of SnO Nanoparticles Synthesized Using Microwave–Assisted Hydrothermal Route
SnO nanoparticles were synthesized using microwave–assisted hydrothermal method. It was noticed that at 300 and 600 watt microwave power, SnO formed and remained in the tetragonal phase. At 900 watt, SnO2 started appearing and a mixture of SnO and SnO2 phases coexisted. The particle size varied from ~2 to ~13 nm at 300 to 900 watt radiation power. The UV-V absorption spectra showed the excitoni...
متن کاملPressure dependence of phosphorescence through energy transfer from inorganic quantum well to naphthalene chromophore in (C10H7C2H4NH3)2PbCl4
The organic-inorganic hybrid quantum well compound, (C10H7C2H4NH3)2PbCl4, exhibits enhanced phosphorescence due to the energy transfer from the excitonic state of inorganic quantum well to the triplet state of naphthalene chromophore. In the present study, photoluminescence and optical absorption spectra of (C10H7C2H4NH3)2PbCl4 were investigated under pressure to 6.5 GPa in order to investigate...
متن کاملIdentification of excitonic phonon sideband by photoluminescence spectroscopy of single-walled carbon-13 nanotubes
Department of Mechanical Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan (Received 9 August 2005) Abstract We have studied photoluminescence (PL) and resonant Raman scatterings of single-walled carbon nanotubes (SWNTs) consisting of carbon-13 (SWCNTs) synthesized from a small amount of isotopically modified ethanol. There was almost no change in the Raman spe...
متن کاملTheory of exciton–charge transfer state coupled systems
We present a systematic density matrix theory of excitons interacting with charge transfer states in molecular systems subject to influence of a semiclassical bath. An excitonic dimer interacting non-linearly with an overdamped Brownian oscillator bath is studied, and the effect of eigenstate renormalization by interaction with the bath is shown to be essential in a correct description of the u...
متن کاملSpectral features due to dark exciton in photoluminescence map of single-walled carbon nanotubes
Features in Photoluminescence Map of SWNTs Over the past seven years photoluminescence (PL) spectroscopy has emerged as an important characterization tool for determining the (n, m) chirality and population of semiconducting SWNTs. This technique is essential for the chirality selective growth and/or the separation depending on chirality. Under excitation with the appropriate wavelength of ligh...
متن کامل