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Absorption (1–3) and steady-state PL (4,5) of aqueous solution (1) of 2416SL at the concentration of 5·10−6 M (1) and 2416SL films before (2,5) and after thermal annealing at 470 K (3,4); differential spectrum, Δ, (6) obtained by subtraction of the spectrum (2) from the spectrum (3). λe = 405 nm; T = 296 K.
