Table 2.
Optical and photophysical properties of the PBI derivatives in chloroform solution, and as annealed spin-coated PBI thin films
| Sample | λabsa/nm | λema/nm | τF/ns | ΦF/% | |
|---|---|---|---|---|---|
| 4,6-ab-PBI | Solution | 528 | 530 |
0.3 (40%), 4.1 (60%)b |
1 |
| Film | 628 | 708 | 0.7 | 2 | |
| 6,8-ab-PBI | Solution | 528 | 530 |
0.3 (72%), 4.7 (28%)b |
1 |
| Film | 557/577 | 668 | 1.9 | 27 | |
| 8,10-ab-PBI | Solution | 527 | 530 |
0.2 (52%), 4.3 (48%)b |
2 |
| Film | 559 | 684 | 6.1 | 60 | |
aThe given values are those for the maximum of the largest wavelength absorption and emission band.
bBiexponential fits, obtained by deconvolution; fractional intensities are given in parentheses.