Circularly polarized polymeric light-emitting diodes: preparation and properties

Organic light emitting diodes with circularly polarized luminescence (CPL) properties have drawn extensive attention owing to their significant potentials in 3D displays, spintronics, encrypted data storage, and so forth. Amongst various reported CPL materials, polymer-based chiral emitters have constituted an important class because of their advantages of high thermal stability, good film-forming property, low cost and good solution processability, which are helpful in developing emission-color adjustable, large area and flexible photoelectric devices. In this review, we systematically summarize the state-of-the-art of circularly polarized polymeric light-emitting diodes (CP-PLEDs), in which the different types of polymer-based emitting materials covering chiral conjugated luminescent polymers, achiral conjugated luminescent polymers doped with chiral inducers, and chiral polymer-based metal complexes are introduced. Additionally, the challenges and opportunities for the future development of CP-PLEDs are also discussed. This review article is expected to stimulate more unprecedented achievements of polymer-based CPL emitters as well as the related electroluminescent devices, thus further promoting their future practical applications.