To experimentally investigate the impact of macrocyclic structures on the nonradiative decay rate constants () of thermally activated delayed fluorescence (TADF), a macrocyclic molecule L-ring and its analogue NL-ring were designed and synthesized. The photophysical measurements reveal their TADF characteristics, and the of the L-ring (4.19 × 10 s) is slower than that of the NL-ring (1.96 × 10 s), endowing the L-ring with a photoluminescence quantum yield of 92.00%. Therefore, the L-ring device exhibited a high external quantum efficiency of 25.61%.
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