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Fluorescence of Phthalocyanines: Emission From an Upper Excited State

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The weak (Φf < 10-3) fluorescence at around 430 nm of the S2 upper excited singlet state of metal-free phthalocyanine and metallophthalocyanines is presented. Polarization measurements indicate that the emission is short-lived (< 800 ps) contrary to the intense (Φf > 0.3) normal emission at around 700 nm originating from S1 and having a lifetime in the 4.1 to 10.6 ns range, depending on the solvent. The short wavelength emitting S2 excited state has been populated by a two photon absorption process using the excitation light at 695 nm of a pulsed ruby laser. This process is shown not to involve the triplet state but the following hυ hυ stepwise two photon absorption process: So → S1 → Sn → S2 .


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