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. Author manuscript; available in PMC: 2015 Sep 8.
Published in final edited form as: Nanotechnol Rev. 2012 Mar;1(2):111–146. doi: 10.1515/ntrev-2011-0005

Figure 13.

Figure 13

UC and TPA.

Qualitative Jablonski diagrams of two possible photon UC processes and a two-photon excitation for use in PDT. ESA, excited state absorption; ETU, energy transfer UC; Si, intermediate; Sv, virtual.