Table 2.
Photophysical Data of BTE-2PBT and a Reference PBT AIEgen (4) a.
| Compound | State | λabs (nm) (ε = M−1cm−1) |
λem (nm) (Δν) |
ΦF (%) | αAIE (ΦF,solid/ΦF,soln) |
τ (ns) |
|---|---|---|---|---|---|---|
| BTE-2PBT | soln | 388 (2.91 × 104) | 477 (5560) | 0.1 | -- | <0.1 |
| solid b | 413 | 475(1219) | 1.2 | 12 | 0.78 | |
| film | 385 | 477(3307) | 2.6 | 26 | 1.62 | |
|
soln | 384 (1.26 × 104) | 474 (3903) | 0.5 | -- | <0.1 |
| solid c | 422 | 507 (2351) | 39.1 | 78.2 | 5.75 | |
| film | 385 | 471 (4410) | 4.2 | 8.4 | 2.05 |
a Abbreviations: soln = THF solution (5 × 10−5 M); ε = molar absorptivity (M−1cm−1); Δν = Stokes shift (cm−1); ΦF = fluorescence quantum yield determined using a calibrated integrating sphere; αAIE = value of AIE effect; τ = fluorescence lifetime measured at room temperature in air; b Determined on amorphous sample; c Determined on crystalline sample.