AI Article Synopsis
- The development of circularly polarized electroluminescence (CPEL) faces challenges due to the high cost and complexity of creating suitable chiral materials and issues with chirality loss in devices.
- Researchers synthesized diastereomeric Ir and Ru complexes using chiral camphorsulfonate counteranions to enhance performance in circularly polarized light-emitting electrochemical cells.
- Incorporating a chiral ionic liquid significantly improved device performance and electroluminescence dissymmetry factors, indicating that chiral anions are crucial for enhancing CPELs in these systems.
Article Abstract
The development of circularly polarized electroluminescence (CPEL) is currently hampered by the high difficulty and cost in the syntheses of suitable chiral materials and the notorious chirality diminishment issue in electrical devices. Herein, diastereomeric Ir and Ru complexes with chiral (±)-camphorsulfonate counteranions are readily synthesized and used as the active materials in circularly polarized light-emitting electrochemical cells to generate promising CPELs. The addition of the chiral ionic liquid (±)-1-butyl-3-methylimidazole camphorsulfonate into the active layer significantly improves the device performance and the electroluminescence dissymmetry factors (≈10 ), in stark contrast to the very weak circularly polarized photoluminescence of the spin-coated films of these diastereomeric complexes. Control experiments with enantiopure Ir complexes suggest that the chiral anions play a dominant role in the electrically-induced amplification of CPELs.
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