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. 2015 Apr 15;20(4):6739–6793. doi: 10.3390/molecules20046739

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© 2015 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/).

PMC Copyright notice

Successive two-photon excitation (a) via localized dopant states (LS) (b) via delocalized states in an extrinsic band (Ex.B) (reproduced from [74] with permission of ACS.