report 33 with slight modifications. NPL-acceptor complexes were prepared by sonicating excessive acceptor powder in NPL colloids. Details can be found in the Supporting Information, section S1.Experimental Setup. Transient absorption measurements were based on a regenerative amplified Ti:Sapphire femtosecond laser system (Astrella, Coherent, 800 nm, 1 kHz, 35 fs pulse duration, and 5.1 mJ/pulse). Time-resolved PL decay was measured using a time-correlated single-photon-counting technique (Becker & Hickel SPC 600). More details of instrumentation for optical characterizations can be found in the Supporting Information, sections S2, S4, and S5.