Table 1. Spectral properties of LS455, LS456, LS542, and LS631 in methanol.
| Compounds | ||||
|---|---|---|---|---|
| Optical Properties | LS456 | LS455 | LS542 | LS631 |
| Absorption Coefficient at 780 nm (cm−1M−1) | 215000 | 209300 | 218800 | 217400 |
| Absorption Coefficient at 620 nm (cm−1M−1) | 11893 | 13799 | 13592 | 12020 |
| Quantum yield at 800 nm emission (ex. @620 nm) | 8.5% | 2.4% | 8.7% | 9.0% |
| Quantum yield at 700 nm emission (ex. @620 nm) | 1.7% | 6.8% | 0.56% | 0.72% |
| Relative brightness* at 800 nm emission (ex. @620 nm) | 1 | 0.33 | 1.17 | 1.07 |
| Relative brightness at 700 nm feature (ex. @620 nm) | 0.20 | 0.93 | 0.08 | 0.09 |
*Relative brightness calculated by multiplying the absorption coefficient of the dyes at 620 nm (common absorption coefficient) by their respective quantum yields of 700 and 800 nm features, and referenced to LS456 at 800 nm.