Fluorescence spectroscopic analysis of indocyanine green J aggregates in water

Abstract Indocyanine green in water forms J aggregates, which are observed as a red-shifted narrow absorption band at 890 nm. The fluorescence quantum distribution of the indocyanine green J aggregates was studied by continuous wave laser excitation at 834 nm. A fluorescence quantum yield of Ф F ≈ 3 × 10 −4 was measured. The fluorescence peak coincides with the absorption peak (no Stokes shift).

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