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Table 1 Energy gaps determined with a four-level model including a higher triplet excited state (Tn)

From: Control of the Singlet–Triplet Energy Gap in a Thermally Activated Delayed Fluorescence Emitter by Using a Polar Host Matrix

Energy gap 0 wt% 50 wt%
S1–T1 230 ± 10 meV 165 ± 10 meV
Tn–T1 150 ± 5 meV 120 ± 5 meV