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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.