Electrically Amplified Circularly Polarized Luminescence by a Chiral Anion Strategy

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 III and Ru II 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 À 3 ), in stark contrast to the very weak circularly polarized photoluminescence of the spin-coated films of these diastereomeric complexes. Control experiments with enantiopure Ir III complexes suggest that the chiral anions play a dominant role in the electrically-induced amplification of CPELs.

Full-Color Circularly Polarized Luminescence of Supramolecular Polymers with Handedness Inversion Regulated by Anion and Temperature

“…Circularly polarized luminescence (CPL) materials have attracted much attention due to their potential applications in fields such as chiral sensing, − encrypted transmission and storage of information, , and 3D displaying. , Up to now, scientists have developed numerous methods to construct CPL active materials. − Among them, supramolecular self-assembly has emerged as one of the most popular approaches due to the following advantages: (a) nonlinear amplification of the chirality with CPL amplification; − (b) fine tuning of the emission wavelength of CPL active materials with full color through the coassembly of chiral host matrices and achiral fluorescent dyes; − (c) dynamic regulation of the handedness direction of supramolecular materials with CPL inversion, independent of the absolute configuration chirality of monomers. − However, the reported full-color CPL materials with left- and right-handedness mainly focus on the supramolecular assembly of enantiomers with opposite molecular chirality. , It remains a formidable challenge to construct the full-color CPL materials in the solid state with switchable handedness inversion from the homochiral monomers.…”

Large in-plane anisotropic 2D perovskites toward highly linear polarized light responses

“…Homochirality is a powerful tool to regulate both structures and properties of materials, and it has been proven to be effective in many fields including ferroicity, [30][31][32] circularly polarized luminescence, 33,34 and circularly polarized light detection. [35][36][37] How to improve the polarization responses through homochirality is an unexplored challenge.…”