Strong Coupling Hybrid Modes for Narrow‐band, Directional and Polarized OLEDs

Abstract

ABSTRACT Linearly polarized organic light‐emitting diodes (LP‐OLEDs) featuring high color purity and directional emission have become essential light sources for near‐eye displays, holographic projection, and high‐precision optical sensing. However, a strategy capable of simultaneously controlling multiple parameters including color purity, directionality, polarization, and optoelectronic efficiency has remained an unmet challenge in OLED development. Herein, we demonstrate a blue‐emitting OLED that combines high color purity with highly directional transverse‐electric (TE)‐polarized emission, realized through a strongly photon‐photon mode‐coupled microcavity architecture. By hybridizing the second‐order Fabry‐Perot mode with the first‐order grating microcavity mode, the system achieves strong coupling with a mode splitting energy of 321 me. Consequently, the resulting polarized OLED exhibits outstanding performance including a transverse‐electric/transverse‐magnetic polarization extinction ratio of 17.3 dB, an external quantum efficiency of 3.4%, and a narrow full width at half maximum of 17.0 nm with an angular distribution of 10°. These findings validate the practical viability of microcavity coupling for advancing optoelectronic devices, particularly in display technologies and photonic integration.