Coordination Complex Hole Layers for Lower-Voltage OLED Injection

The patent applies parameter changes by modifying the electronic structure of coordination complexes through varying ligand types (carbazole, triphenylamine, dibenzofuran), substitution patterns (fluoro, cyano, alkyl groups), and metal centers (Cu, Ag, Au). These parameter modifications optimize HOMO levels and hole mobility, achieving reduced operational voltage (e.g., from 6V to 4V in Example 3) while maintaining manageable material complexity.

The patent employs composite materials by creating coordination complexes that combine electropositive metal atoms with organic ligands containing electron-donating groups. The composite structure of metal center + ligand framework (e.g., Cu(I) with tris(carbazolyl)borate) achieves synergistic effects that improve hole injection and transport performance beyond what single-component materials can provide.

The patent applies local quality by designing coordination complexes with specific functional groups positioned at particular locations within the molecular structure. For example, electron-donating substituents (tert-butyl, methoxy) are placed at specific positions on the ligand framework to locally enhance electron density and improve hole transport capability, achieving quantum efficiency improvements (e.g., from 5% to 15% in Example 5) without requiring complex manufacturing processes.

The patent uses copying by developing a series of coordination complexes based on proven ligand frameworks (e.g., tris(carbazolyl)borate, triphenylamine derivatives). Once a successful structural template is identified, variations are created by copying the core structure and modifying specific substituents, which simplifies the manufacturing process while systematically improving quantum efficiency across multiple compounds.