Figure 8.

Nanosecond transient absorption spectra of compounds in de‐aerated toluene. a) Transient absorption spectra of BDP‐1 at different delay time. b) The decay trace at 630 nm, λ _ex=620 nm, c=5.0×10⁻⁶ M. c) Transient absorption spectra of BDP‐3 and d) the decay trace at 600 nm, λ _ex=590 nm, c=1.0×10⁻⁵ M, 20 °C. The intrinsic lifetime was obtained by fitting of the decay curves with a kinetic model that takes into account of the triplet‐triplet‐annihilation effect.22