Triplet-triplet annihilation upconversion (TTA-UC) can enhance electroluminescence (EL) efficiency by converting two low-energy triplet excitons into one high-energy singlet exciton. However, conventional (intermolecular) TTA-UC requires high doping concentration, limiting device architectures. Here, we discuss the possibility of the intramolecular TTA-UC, which can be utilized even in dispersed conditions.