Organic Electroluminescent Compound for Low-Voltage Color Purity

The patent employs a host/dopant composite material system where a dopant material is dispersed within a host material matrix. This composite approach enables energy transfer from the host to the dopant, achieving high color purity and luminous efficiency while managing the complexity through systematic material selection and ratio optimization.

The patent optimizes multiple parameters including driving voltage, material energy levels, HOMO/LUMO values, and triplet excitation energies to achieve efficient operation at lower voltages while preventing Joule heating-induced crystallization. By carefully selecting materials with appropriate energy level alignments, the device maintains high efficiency without excessive heat generation that would compromise lifespan.

The patent applies local quality optimization by selecting hole transport materials with specific local properties (appropriate HOMO values for energy alignment) while ensuring they possess sufficient T1 values to prevent exciton leakage. This localized material property optimization at the hole transport layer level maintains both energy level alignment and charge balance without requiring global system changes.

The patent resolves the contradiction between simplicity and color purity by employing a composite host/dopant material system. The dopant material, present in small amounts, provides the desired emission characteristics with high color purity, while the host material provides structural support and facilitates energy transfer. This composite approach achieves superior optical properties without significantly increasing device complexity.