Table 2.

Room temperature fluorescence quantum yields (ϕ_F) and emission lifetimes^a (τ_i) for compounds D1 and D2 in pure solvents. Also presented are the associated pre‐exponential factors (a_i), the fractional contributions for each decay time (%C_i), and the chi‐square values (χ²) for the judgment of the quality of the fits. Radiative (k_F) and radiationless rate (k_NR) constants associated with the third decay component (τ₃) are also listed.

Dye	Solvent	Concentration [μM]	ϕF	τ1 [ns]	a1 [C1%]	τ2 [ns]	a2 [C2%]	τ3 [ns]	a3 [C3%]	χ2	b)kF ×10−6 [s−1]	c) kNR ×10−8 [s−1]
D1	THF	50	0.013					4.07	1 (100)	0.69	3.19	2.43
	DCM	50	0.102					5.41	1 (100)	0.81	18.9	1.66
	MeOH	50	0.002	0.16	0.889 (44)	1.18	0.096 (35)	4.40	0.015 (21)	1.04	0.46	2.27
	ACN	50	0.11					4.36	1 (100)	0.70	25.2	2.04
	Film	–	0.007	0.14	0.968 (50)			4.27	0.032 (50)	1.09	1.64	2.36
D2	THF	50	0.001	0.34	0.902 (62)	1.51	0.089 (27)	5.65	0.010 (11)	0.92	0.18	1.77
	DCM	50	0.022	1.21	0.146 (5.5)			3.55	0.854 (94.5)	0.68	6.2	2.75
	MeOH	5	0.067			13.31	0.026 (7.0)	4.56	0.974 (93)	1.16	14.7	2.05
		10	0.018			13.30	0.028 (8.0)	4.5	0.972 (92)	1.04	4.0	2.18
		25	0.003	0.42	0.894(30)	18.65	0.025 (37)	5.03	0.081 (33)	1.01	0.60	1.98
		50	0.001	0.48	0.797 (22)	21.21	0.019 (24)	5.02	0.184 (54)	1.11	0.20	1.99
	ACN	50	0.008					2.36	1 (100)	0.6	3.4	4.20
	Film	–	0.001	0.19	0.996 (92)			4.17	0.004 (8)	0.82	0.24	2.40

[a] Experimental conditions: λ^ex=460 nm [b] $k_F=\frac{{\varphi }_F}{{\tau }_F}$ . [c] $k_{NR}=\frac{1-{\varphi }_F}{{\tau }_F}$ .