We present a comparative experimental and theoretical investigation of the two–dimensional charge-transfer gap in the strongly correlated material Sr2CuO2Cl2. We observe an Urbach behaviour in the absorption profile over a surprisingly wide range of energies and temperatures. We present a model that accounts for phonon scattering to infinite order and which allows us to explain the data accurat...

The Tauc–Lorentz–Urbach (TLU) dispersion model allows us to build a dielectric function from only few parameters. However, this is non-analytic and presents some mathematical drawbacks. As consequence of issue, the becomes inaccurate. In present work, we will adopt procedure conveniently transform TLU into self-consistent model. transformation involves integration original imaginary ϵ2 by using...

Abstract III-V nitride semiconductors have been characterized by photothermal deflection spectroscopy (PDS) which can provide the information of non-radiative recombination involving defect levels. After understanding challenges applying PDS to materials emitting light, advantages and features were described for evaluating defects level in band gap. The reciprocal slope spectrum near bandgap en...

ZnO and ZnO:Mn nanocrystals synthesized via reverse micelle method. The size, band gap, Urbach energy, optical constants and penetration depth of nanocrystals were calculated by UV-vis spectroscopy data. The surface morphology was studied with the use of scanning electron microscope (SEM). Moreover the samples exposed to Gama ray source of 60Co and their thermoluminescence properties...

ZnO and ZnO:Mn nanocrystals synthesized via reverse micelle method. The size, band gap, Urbach energy, optical constants and penetration depth of nanocrystals were calculated by UV-vis spectroscopy data. The surface morphology was studied with the use of scanning electron microscope (SEM). Moreover the samples exposed to Gama ray source of 60Co and their thermoluminescence properties...

This article discusses details study on crystallization , optical properties of Li-Al-Si-La glass containing nanocrystalline LaF3.and their optical energy gaps. The Urbach energy of glass samples was evaluated. By using (2% mole) Tb the green–blue range emission occurred, while by accumulation 1% mole Gd beside Tb, the indigo emission intensity (418 to 441 nm) increased.

Review copy ± not for distribution (pss-logo will be inserted here by the publisher) pss-­‐Header will be provided by the publisher 1 Introduction The continuous random network (CRN) has become the accepted model for homogeneously disordered materials, and for good reason: such atomistic models reproduce the experimentally observed properties of the materials, including some of the finer detail...

Citation Letz, M. et al. " Temperature-dependent Urbach tail measurements of lutetium aluminum garnet single crystals. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matte...