E LH = EL − EH, first singlet excitation energies (Eopt) and exciton binding energy (Eb) of investigated compounds in eV.
| Compounds | E L–H | E opt | E b |
|---|---|---|---|
| PMD-1 | 2.131 | 1.689 | 0.442 |
| PMDC2 | 2.079 | 1.695 | 0.384 |
| PMDC3 | 2.103 | 1.719 | 0.384 |
| PMDC4 | 2.065 | 1.690 | 0.375 |
| PMDC5 | 2.059 | 1.684 | 0.375 |
| PMDC6 | 2.004 | 1.677 | 0.327 |
| PMDC7 | 2.656 | 2.186 | 0.470 |
| PMDC8 | 2.485 | 2.063 | 0.422 |