Journal of Materials Science

, Volume 42, Issue 9, pp 3255–3258 | Cite as

Urbach tail of gadolinium trihydride films

  • E. Shalaan
  • H. Schmitt


The fundamental absorption edge of the gadolinium trihydride has been studied by performing optical transmission measurements at temperatures ranging from 298 K to 353 K. Urbach tails and the photon absorption spectra give information about the exciton dynamics, distinguishing between free and trapped excitons in the lattice. Our experimental results can be accounted for in terms of the theory of Toyozawa and co-workers, which ascribe the Urbach tail to the momentary localization of excitons due to phonon interaction.


Fundamental Absorption Edge Urbach Energy Phonon Coupling Optical Absorption Edge Urbach Tail 
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We gratefully acknowledge the financial support of the German Research Foundation (DFG) in the Research Training Group, New high performance materials for efficient energy usage (Neue Hochleistungswerkstoffe für effiziente Energienutzung).


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Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  1. 1.Technical PhysicsSaarland UniversitySaarbrueckenGermany

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