Standardizing the characterization of circularly polarized luminescence of chiral materials

The exciting field of circularly polarized luminescence has motivated researchers to design innovative chiral emitting systems with engineered structural and electronic features, including small organic molecules, inorganic complexes, perovskites and supramolecular and polymeric systems. The common goal is for these materials to interact very differently with left vs. right circularly polarized light, giving them the ability to modulate and transmit the polarization state of a light signal. The measured chiroptical activity is often quantified by the luminescence dissymmetry factor, which has naturally become the key parameter for characterizing the performance of chiral emitters. However, the correct quantification of this factor can be challenging due to the different photophysical processes involved and varying measurement conditions, making it difficult to reliably compare different material designs and devices. Here we offer practical advice and guidelines on measurement conditions and procedures for various classes of material, aiming to enhance the reproducibility and reliability of chiroptical measurements. We hope that these best practices will benefit the community by addressing common challenges related to inconsistencies and standardization. This Perspective offers practical guidelines for the optical characterization of chiral materials, aiming to improve the consistency and reproducibility of experimental results.