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Diffusion of localized optical excitations and trap emission in ruby

Heinrichs, J and Kumar, A Anil and Kumar, N (1977) Diffusion of localized optical excitations and trap emission in ruby. In: Journal of Physics C: Solid State Physics, 10 (3). pp. 391-396.

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Official URL: http://www.iop.org/EJ/abstract/0022-3719/10/3/009/


Using the critical percolation conductance method the energy-dependent diffusion coefficient associated with thermally assisted transfer of the R1 line excitation between single Cr3+ ions with strain-induced randomness has been calculated in the 4A2 to E(2E) transition energies. For localized states sufficiently far away from the mobility edge the energy transfer is dominated by dipolar interactions, while very close to the mobility edge it is determined by short-range exchange interactions. Using the above energy-dependent diffusion coefficient a macroscopic diffusion equation is solved for the rate of light emission by Cr3+ ion-pair traps to which single-ion excitations are transferred. The dipolar mechanism leads to good agreement with recent measurements of the pair emission rate by Koo et al. (Phys. Rev. Lett., vol.35, p.1669 (1975)) right up to the mobility edge.

Item Type: Journal Article
Publication: Journal of Physics C: Solid State Physics
Publisher: Institute of Physics
Additional Information: Copyright of this article belongs to Institute of Physics.
Department/Centre: Division of Physical & Mathematical Sciences > Centre for Theoretical Studies (Ceased to exist at the end of 2003)
Division of Physical & Mathematical Sciences > Physics
Date Deposited: 01 Feb 2010 05:56
Last Modified: 19 Sep 2010 05:51
URI: http://eprints.iisc.ac.in/id/eprint/24615

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