TADF OLED Material for Higher Triplet Exciton Utilization

The patent introduces a TADF compound with specific molecular structure (formula 1) that changes the energy level parameters to create a small energy difference (ΔST) between singlet and triplet excitons. This parameter change enables thermal activation of triplet excitons to singlet excitons, converting the 75% triplet excitons that would otherwise be wasted into useful light emission, thereby doubling the internal quantum efficiency from 25% to potentially 62.5% or higher while maintaining full-color display capability

The patent converts the harmful waste of triplet excitons (which constitute 75% of generated excitons but cannot emit light in conventional fluorescent devices) into a beneficial resource. By using the TADF mechanism where triplet excitons are thermally activated to singlet excitons that can then emit light, the previously wasted triplet excitons become productive, effectively turning the 75% loss into a 62.5% or higher efficiency gain

The patent applies local quality by introducing specific functional groups (donor and acceptor moieties) at localized positions in the molecular structure (formula 1) to create the necessary TADF properties. The compound features a core structure with specifically positioned substituents that provide the small ΔST energy difference, allowing the molecule to exhibit TADF characteristics without requiring complete structural redesign of the entire device architecture

The patent employs composite material principles by creating a TADF compound that combines donor and acceptor moieties within a single molecular structure (formula 1). This composite molecular design integrates multiple functional elements (electron-donating groups and electron-accepting groups) into one compound that simultaneously provides the necessary optical properties and TADF mechanism, simplifying the overall device structure compared to using multiple separate materials

The patent systematically changes molecular parameters by selecting specific donor and acceptor groups in formula (1) to achieve the desired small ΔST energy difference. The compound structure allows tuning of energy levels through substitution patterns and group selection, providing a manufacturable approach to achieving consistent TADF properties across production batches

The patent describes a TADF compound with a well-defined molecular structure (formula 1) that can be synthesized through standard organic synthesis methods. The compound design balances performance requirements with manufacturing feasibility, using commonly available building blocks and synthesis routes that do not require extreme precision or rare materials, making the solution economically viable for commercial OLED production