Highly Efficient, Conventional, Fluorescent Organic Light-Emitting Diodes with Extended Lifetime

Highly efficient, yellow-fluorescent organic light-emitting diodes with a maximum external quantum efficiency exceeding 25.0% and extended lifetime are reported using iridium-complex sensitizers doped in an exciplex host. Energy transfer processes reduce the lifetime of the exciplex and excitons on the Ir complexes and enable an excited state to exist in a conventional fluorescent emitter, thereby increasing device lifetime. The device stability depends on the location of the excited state.

Highly efficient, conventional, fluorescent organic light-emitting diodes with a maximum external quantum efficiency exceeding 25.0% are fabricated using iridium (Ir) complex sensitizers doped in an exciplex host. Energy-transfer processes reduce the lifetime of the exciplex and excitons in the Ir complex, and enable an excited state to be formed in a conventional fluorescent emitter, thereby increasing device lifetime.

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