Nitrogen-Containing OLED Emitter for Deep Blue TADF Efficiency

The patent changes the energy level parameters of the organic compound by designing specific molecular structures with nitrogen-containing groups, achieving a small energy difference (≤0.2 eV) between singlet and triplet states. This parameter change enables efficient triplet-triplet annihilation and thermally activated delayed fluorescence, resolving the contradiction between light-emitting efficiency and energy loss.

The patent employs composite material design by combining nitrogen-containing heterocyclic groups (such as triazole, tetrazole, pyrazole) with specific molecular backbones. This composite structure achieves both high light-emitting efficiency through triplet-triplet annihilation and stabilizes the device operation, simultaneously improving productivity and reducing energy loss.

The patent extracts and utilizes the triplet state energy through triplet-triplet annihilation to generate singlet excitons, which then emit delayed fluorescence. This approach takes out the triplet state from being a loss channel and converts it into a useful light-emitting pathway, achieving high efficiency without requiring heavy metal complexes or complex phosphorescent material structures.

The organic compound structure is designed to self-enable triplet-triplet annihilation and thermally activated delayed fluorescence through its intrinsic molecular properties. The nitrogen-containing groups and specific structural features allow the material to automatically achieve the desired energy level alignment and emission characteristics without requiring additional complex components or external assistance.