Fig. 4From: Control of the Singlet–Triplet Energy Gap in a Thermally Activated Delayed Fluorescence Emitter by Using a Polar Host Matrix a Spectral position of fluorescence and (b) estimated ΔE ST as a function of CA concentration. In panel a, solid squares and circles represent the peak photon energy and the onset of fluorescence, respectively. In panel b, open squares and circles indicate ΔE ST values estimated from the peak photon energy and the onset, respectively, under the assumption that ΔE ST is 230 meV at 0 wt% CA concentrationBack to article page