Table 3.

Wavelength (λ_max), excitation energy (E) and oscillator strength (f_os) of investigated compounds in chloroform.

Compounds	λmax (nm)	E (eV)	fos	MO contributions
TPDR	658.89 (632)a	1.88	2.42	H → L (95%)
TPD1	741.93	1.67	2.31	H → L (96%)
TPD2	757.11	1.63	2.31	H → L (96%)
TPD3	739.63	1.67	2.27	H → L (96%)
TPD4	810.78	1.53	2.25	H → L (96%)
TPD5	714.56	1.73	1.54	H → L + 2 (96%)
TPD6	748.65	1.65	2.05	H → L (95%),

MO molecular orbital, H HOMO, L LUMO.

^aExp. value in parentheses³⁰.