Table 1.

Spectroscopic properties of PBI 1 in dichloromethane solution and in the crystalline solid state at 298 K.

	λ abs	FWHM abs [a]	λ em	FWHM em [a]	Δṽ Stokes	Φ F	τ F
	[nm]	[cm−1]	[nm]	[cm−1]	[cm−1]	[%]	[ns]
CH2Cl2	559	750	581	1130	680	100	5.20
Solid	557[b]	1000	565[c]	570	260	>90[b]	7.70[b]

[a] FWHM was derived as twice the distance between the maximum to the closest edge at half‐maximum of the unsymmetrically shaped absorption or emission band to prevent falsification by overlapping transitions. [b] Ensemble property of crystalline material. [c] Single microcrystal investigated with an optical polarization microscope equipped with a fiber‐coupled CCD spectrometer.