Table 1 Photophysical characteristics of CzBN derivatives in toluene
CompoundPLmax
(nm)
PLQY
(%)*
ΔEST
(eV)
Embedded Image
(eV)
Embedded Image
(eV)§
Ea (eV)τp (ns)τd (μs)kr
(107 s−1)
kISC
(108 s−1)
kRISC
(105 s−1)
knrT
(104 s−1)
5CzBN4707/750.170.32−0.100.133.846.81.92.52.20.6
3Cz2DMeCzBN4808/850.170.30−0.130.105.923.61.31.54.40.7
4Cz1DPhCzBN48011/850.150.16−0.010.097.019.41.61.33.90.9
3Cz2DPhCzBN4809/810.150.16−0.010.065.812.21.51.57.21.7
2Cz3DPhCzBN49213/830.130.19−0.060.085.26.12.51.710.23.2

*PLQY for before (left) and after (right) Ar bubbling. The error is ±2%.

†Energy gap between S1 and T1 states. The error is ±0.03 eV.

‡Energy gap between 3CT1 and 3LE1 states. The error is ±0.03 eV.

§Energy gap between 1CT1 and 3LE1 states. The error is ±0.03 eV.

¶The error is ±0.01 eV.