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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

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