Potential-Resolved Multicolor Electrochemiluminescence of N-(4-AminobutyI)-N-thylisoluminol/tetra(4-carboxyphenyl)porphyrin/TiO2 Nanoluminophores

Most electrochemiluminescence (ECL) studies involve single luminophore with a unique emission process, which severely limits its applications. Recently, multicolor ECL has attracted considerable interests. Herein, we report a novel nanoluminophore prepared by coating 5,10,15,20-tetrakis(4-carboxypheny1)-porphyrin (TCPP) and N-(4-aminobutyl)-Nethylisoluminol (ABEI) on the surface of TiO2 nanoparticles (TiO2-TCPP-ABEI), which exhibited unique potential-resolved multicolor ECL emissions using H2O2 and K2S2O8 as coreactants in an aqueous solution. Three ECL peaks, ECL-1 at 458 nm, ECL-2 at 686 rim, and ECL-3 at 529 rim, were obtained with peak potentials of 1.05, -1.65, and -1.85 V, which were attributed to the ECL emission of ABEL TCPP, and TiO2 moiety of the nanoluminophores, respectively. Potential resolved multicolor ECL from a nanoluminophore was observed for the first time in an aqueous solution. It opens a new research area of multicolor ECL of nanoluminophores, which is of great importance in ECL field from fundamental studies to practical applications.