Near?Infrared Emission by Tuned Aggregation of a Porphyrin Compound in a Host–Guest Light?Emitting Electrochemical Cell

The synthesis of 5,10,15,20-tetrakis((5,10-bis((2-hexyldecyl)oxy)dithieno[3,2-c:3?,2?-h][1,5]naphthyridin-2-yl)ethynyl)porphyrin zinc(II) (Por4NT), a near-infrared (NIR) emitting compound, comprising zinc porphyrin core linked with triple bonds through its meso positions to four 5,10-bis((2-hexyldecyl)oxy)dithieno[3,2-c:3?,2?-h][1,5]naphthyridine (NT) arms is reported. Por4NT featured high solubility in common non-polar solvents, which ideal for easy processing solution techniques, and photoluminescence (PL) efficiency ?30% dilute toluene solution. It also exhibited strong tendency aggregation because flat conformation, this resulted redshifted emission drop PL efficiency. A well-matched PBDTSi-BDD-Py “host” terpolymer therefore designed, capable mitigating the “guest”. An optimized blend host, guest, an ionic-liquid electrolyte utilized as active material light-emitting electrochemical cell (LEC), delivered NIR radiance 134 µW cm-2 long wavelength maximum at 810 nm low drive voltage 5.0 V. attainment from host–guest LEC attributed tuned emitter, desired aggregation-induced redshift reasonably retained