Table 1. Exciton Quenching in F8BT Nanoparticles via Pd Clusters or DEA^a.

Pd content (ppm)	aqueous medium	k (ns–0.87)	QYexc via IQ/I0	QYexc via (k – k0)/k
1170	H2O	2.3	0.54	0.48
195	H2O	1.8	0.44	0.33
36	H2O	1.5	0.28	0.20
<1	H2O	1.2	0	0
<1	30 vol % DEA in H2O	1.7	0.24	0.29

^aExciton decay rate constants k were obtained from stretched exponential fits to the data as shown in Figure 2, using y ∝ exp(−kt^b), where the stretching exponent b = 0.87 was fixed for all decays to enable a comparison of k. Exciton quenching yields (QY_exc) were estimated in two complementary ways: (i) via I_Q/I₀ by comparing the integrated signal intensities in the presence of a quencher I_Q (with quenchers being Pd or DEA) to the integrated signal intensity in the absence of a quencher I₀ or (ii) via (k – k₀)/k by comparing changes in rate constants, where k₀ represents the exciton decay in the absence of a quencher. In both cases, quenchers were taken as absent in the <1 ppm Pd sample in H₂O.