Table 3. Spectroscopic Properties of BDT-Series Compounds in Toluene Solution.

compound	ε × 104 [M–1 cm–1]	λmaxabs [nm]	λmaxemi [nm]	Φf [%]b	SS [nm] {eV}c
BDT-H2	5.36	530a	622a	77a	92 {0.35}
BDT-O2	5.01	555	678	31	123 {0.41}
BDT-S2	5.27	541	661	38	120 {0.42}
BDT-H1	2.39	531	654	68	123 {0.44}
BDT-O1	2.40	553	754d	2	201 {0.60}d
BDT-S1	2.85	546	744d	3	198 {0.60}d
BDT-AA	1.34	449	526	66	77 {0.40}

^aIn good agreement with the literature data.¹⁸

^bAbsolute QY determined using an integrating sphere, see the Experimental Section for details.

^cStokes shifts.

^dFor these compounds, characterized by low fluorescence QY and longer emission wavelengths, the λ_max^emi and Stokes shift values are likely overestimated as a result of the application of the correction function necessary to compensate the sensitivity loss of the photomultiplier in the red wavelength region.