Chemical Physics Letters, Vol.475, No.4-6, 220-222, 2009
Efficient S-2 state production in ZnTPP-PMMA thin films by triplet-triplet annihilation: Evidence of solute aggregation in photon upconversion systems
Non- coherent photon upconversion by triplet- triplet annihilation (TTA) of metalloporphyrins in degassed solid thin PMMA films has been investigated. Dual S-1 and S-2 fluorescence of the model chromophore ZnTPP is used to monitor TTA directly. Evidence that aggregation is required for TTA to occur with the measured efficiencies is presented. (C) 2009 Elsevier B.V. All rights reserved.