Spin-valley-locked Electroluminescence for High-Performance Circularly-Polarized Organic Light-Emitting Diodes

TL;DR

This paper introduces spin-valley-locked circularly polarized OLEDs that achieve high efficiency, narrowband emission, and high dissymmetry without chiral emitters, using photonic spin-orbit coupling for advanced display and photonic applications.

Contribution

It demonstrates a novel spin-valley locking approach in CP-OLEDs that surpasses traditional methods in performance and simplicity, enabling practical high-performance circularly polarized light sources.

Findings

Achieved a narrowband emission of 16 nm

High EQE of 3.65 and luminance near 98000 cd/m2

Maximum gEL of up to 1.80

Abstract

Circularly polarized (CP) organic light-emitting diodes (OLEDs) have attracted attention in potential applications including novel display and photonic technologies. However, conventional approaches cannot meet the requirements of device performance, such as high dissymmetry factor, high directionality, narrowband emission, simplified device structure and low costs. Here, we demonstrate spin-valley-locked CP-OLEDs without chiral emitters, but based on photonic spin-orbit coupling, where photons with opposite CP characteristics are emitted from different optical valleys. These spin-valley locked OLEDs exhibit a narrowband emission of 16 nm, a high EQE of 3.65, a maximum luminance of near 98000 cd/m2 and a gEL of up to 1.80, which are among the best performances of active single-crystal CP-OLEDs, achieved with a simple device structure. This strategy opens an avenue for practical applications towards three-dimensional displays and on-chip CP-OLEDs.