A theory for the spontaneous emission due to radiative recombination of excitons in amorphous semiconductors is presented. Four possibilities are considered: (i) both the excited electron and hole are in their extended states, (ii) the electron is in the extended and the hole in tail states, (iii) the electron is in tail and the hole in extended states and (iv) both are in their tail states. It...

Abstract: The present study deals the theoretical modeling aspects of coupled conductive and radiative heat transfer in the presence of absorbing, emitting and scattering gray medium within two-dimensional square furnace including two flames. The gray radiative medium is bounded by isothermal walls which are considered to be opaque, diffuse and gray. The well known discrete ordinate method (DOM...

Solvent-dependent luminescence of Eu(III) complexes composed of oxo-linked bidentate phosphine oxide ligands, 4,5-bis(diphenylphosphoryl)-9,9-dimethylxanthene (xantpo), 4,5-bis(di-tert-butylphosphoryl)-9,9-dimethylxanthene (tBu-xantpo) and low-vibrational frequency hexafluoroacetylacetonato (hfa) ligands is reported. The Eu(III) complexes, Eu(hfa)2(xantpo)2 and Eu(hfa)3(tBu-xantpo), exhibit eig...

Related Articles Investigation of the thermal charge “trapping-detrapping” in silicon nanocrystals: Correlation of the optical properties with complex impedance spectra Appl. Phys. Lett. 101, 242108 (2012) Inhomogeneous linewidth broadening and radiative lifetime dispersion of size dependent direct bandgap radiation in Si quantum dot AIP Advances 2, 042162 (2012) Calibration of the photolumines...

We study the performance of photovoltaic devices when controlling the exciton radiative recombination time. We demonstrate that when high-quantum-yield fluorescent photovoltaic materials are placed within an optical cavity, the spontaneous emission of the radiative exciton is partially inhibited. The corresponding increase of the exciton lifetime results in an increase of the effective diffusio...

Related Articles Enhancement of room temperature dislocation-related photoluminescence of electron irradiated silicon J. Appl. Phys. 113, 033518 (2013) Investigation of the thermal charge “trapping-detrapping” in silicon nanocrystals: Correlation of the optical properties with complex impedance spectra Appl. Phys. Lett. 101, 242108 (2012) Inhomogeneous linewidth broadening and radiative lifetim...

Effects of a solid matrix on the dye kinetic parameters for Rh800 were experimentally studied. Saturation intensity dependencies were measured with a seeding pulse amplification method using a picosecond and a femtosecond white light supercontinuum source. The kinetic parameters were obtained by fitting experimental dependencies with Yee's finite-difference time-domain model coupled to the rate...

We developed a technique using nonlinear correlation of photoluminescence (PL) to characterize midwave infrared lasers by extracting the density and temperature dependence of the carrier lifetime and its exact branching into radiative and nonradiative processes. This was accomplished, without time resolving the PL recovery, through mathematical optimization. We extracted this information by usi...

We present results on the radiative lifetimes of excitons and trions in a monolayer of metal dichalcogenide MoS2. The small exciton radius and the large exciton optical oscillator strength result in radiative lifetimes in the 0.18–0.30 ps range for excitons that have small in-plane momenta and couple to radiation. Average lifetimes of thermally distributed excitons depend linearly on the excito...