Efficient 1400–1600 nm Circularly Polarized Luminescence from a Tuned Chiral Erbium Complex

Novel chiral Er complexes based on both enantiomers of extended iPrPyBox (2,6-Bis[4-isopropyl-4,5-dihydrooxazol-2-yl)]pyridine) show strong near-infrared circularly polarized luminescence (CPL) within the 1400 to 1600 nm spectral region under 450 irradiation. CPL activity in this region, despite being particularly rare, would open way potential applications domain, e.g., fiber-optic telecommunications and free-space long-distance optical communications employing light. Moreover, long wavelength excitation is advantageous for field (circularly polarized) microscopy bioimaging.