Table 2. Selected Photophysical Properties for pDTCz-DPmS in Toluene, THF, DCM, and DMFa.
| solvent | toluene | THF | DCM | DMF |
|---|---|---|---|---|
| ΦPL (%) | 42 (28) | 17 (14) | 7.0 (5.8) | 2.0 (1.4) |
| ΦPROMPT/ΦTADF | 2.0 | 4.7 | 4.8 | 2.3 |
| kISC (s–1)b | 6.36 × 107 | 1.78 × 108 | 1.17 × 108 | 3.12 × 107 |
| kRISC (s–1)b | 1.39 × 105 | 2.65 × 105 | 4.53 × 105 | 5.19 × 105 |
| τp (ns) [weighting (%)] | 7.3 (54) | 3 (59) | 3 (68) | 4 (89) |
| τd (μs) [weighting (%)] | 13.4 (46) | 8.1 (41) | 3.4 (32) | 2.2 (11) |
| ES1 (eV) | 3.20 | 3.09 | 3.20 | 3.13 |
| ET1 (eV) | 2.95 | 2.93 | 2.93 | 2.97 |
| ΔEST (eV) | 0.25 | 0.16 | 0.27 | 0.16 |
a
Photoluminescence quantum yields, ΦPL, were determined under deaerated conditions while the values in parentheses refer to the air-equilibrated solutions. Prompt and delayed lifetimes (τp and τd, respectively) were recorded at room temperature under vacuum using λexc = 378 nm. The first excited singlet (ES1) and triplet energies (ET1) were determined by the onset of the room temperature photoluminescence and 77 K phosphorescence spectra, respectively.
b
Rates are determined using the method and assumptions outlined in reference (27).