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Photobleaching of ADPA by singlet oxygen generated upon two-photon excitation of the water-dispersed nanoparticles co-encapsulating 1.1 wt% HPPH/20 wt% BDSA at 850 nm. Inset: ADPA remaining in water dispersions of the nanoparticles encapsulating 1.1 wt% HPPH (square) and 1.1 wt% HPPH/20 wt% BDSA (circle), as a function of time of irradiation with 850 nm.
