Mixed-Host Organic Electronic Device Compounds for Lower Voltage

The emission layer uses a composite material system consisting of a host material and a dopant material. The host material provides the matrix for energy transfer, while the dopant material (iridium complex) serves as the light-emitting center. This composite approach enables efficient energy transfer from the host to the dopant, achieving high emission efficiency while maintaining device performance.

The invention optimizes the energy level parameters of the host and dopant materials to achieve efficient energy transfer. By carefully selecting materials with appropriate HOMO-LUMO energy levels and T1 values, the device achieves low driving voltage operation. The host material's energy levels are matched to the dopant's emission characteristics, enabling efficient electroluminescence at reduced voltages.

The invention selects host and dopant materials with optimized thermal and electrochemical stability parameters. The host material exhibits high thermal stability to resist Joule heating effects, while the dopant material maintains stable photophysical properties under operating conditions. This parameter optimization extends device lifespan by preventing degradation from thermal and electrical stress.

The emission layer employs a host/dopant composite system where the host material (e.g., TCTA, TAPC) provides the structural matrix and the dopant material (iridium complex) provides the light-emitting function. This composite approach achieves high luminous efficiency through efficient energy transfer while maintaining manageable device complexity through well-established material selection criteria and fabrication processes.