Is a small singlet-triplet energy gap a guarantee of TADF performance in MR-TADF compounds? Impact of the triplet manifold energy splitting

Rasa Keruckiene, Aliaksei A. Vaitusionak, Maksim I. Hulnik, Ivan A. Berezianko, Dalius Gudeika, Simas Macionis, Malek Mahmoudi, Dmytro Volyniuk, Danillo Valverde, Yoann Olivier, Kai Lin Woon, Sergei V. Kostjuk, Sebastian Reineke, Juozas V. Grazulevicius, Gjergji Sini