Geometrical effects in the energy transfer mechanism for silicon nanocrystals and Er3+

Choy, K.; Lenz, F.; Liang, X. X.; Marsiglio, F.; Meldrum, A.
December 2008
Applied Physics Letters;12/29/2008, Vol. 93 Issue 26, p261109
Academic Journal
Silicon nanoclusters (NCs) strongly sensitize the luminescence of Er3+ ions. Attempts to calculate the interaction distance have assumed that the Förster [Ann. Phys. 437, 55 (1948)] and Dexter [J. Chem. Phys. 21, 836 (1953)] relationships for point-to-point energy transfer can be applied to experiments based on multilayered thin-film specimens. Here, the effective finite plane-to-plane relationships are derived for both interaction mechanisms. These relationships show that energy transfer can result from the Förster interaction despite the fact that the measured luminescence intensity varies much more weakly with NC-Er3+ separation than predicted by theory for point dipoles. An effective energy transfer distance is found for the NC-Er3+ system.


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