the ground state, triplet excitons are non-emissive because of spin-conservation rules during light-emission process. In first generation OLEDs, triplet excitons act as substantial energy sinks, thus restricting their internal quantum efficiency to a disappointing 25% due to spin statistics. To overcome this limitation, several approaches have been developed to make triplet excitons emissive, thereby enhancing the maximum internal efficiency of OLEDs to a satisfactory 100%. One strategy involves phosphorescent chromophores, where the inclusion of heavy metals promotes intersystem crossing. Another strategy involves emitters that exhibit thermally activated delayed fluorescence (TADF), as well as a combination of TADF and fluorescent systems used in hyperfluorescence OLEDs. Additionally, multiresonant charge-transfer (MR-CT) emitters are also utilized. On top of this, there has been a recent surge of interest in organic radicals as innovative emitters for OLED devices. Organic radicals, characterized by their open-shell nature with one or more unpaired electrons, open the door to a new mechanism for light emission in OLEDs. Notably, organic radicals bypass singlet and triplet states, emitting light through transitions from a spin doublet excited state to a doublet ground state. This spin-allowed process eliminates the need for intersystem crossing, potentially resulting in higher quantum efficiencies since all recombination processes can contribute to light emission without substantial non-radiative losses.