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

Abstract

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-carboxyphenyl)-porphyrin (TCPP) and N-(4-aminobutyl)-N-ethylisoluminol (ABEI) on the surface of TiO nanoparticles (TiO-TCPP-ABEI), which exhibited unique potential-resolved multicolor ECL emissions using HO and KSO as coreactants in an aqueous solution. Three ECL peaks, ECL-1 at 458 nm, ECL-2 at 686 nm, and ECL-3 at 529 nm, were obtained with peak potentials of 1.05, -1.65, and -1.85 V, which were attributed to the ECL emission of ABEI, TCPP, and TiO 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.

Self-enhanced multicolor electrochemiluminescence by competitive electron-transfer processes

“…45 Self-enhanced ECL has been also applied for sensing applications. 42,[72][73][74] These ndings support the possibility of the intramolecular electron-transfer reaction in our system. The excited state of the helicene compound then deactivates through the emission of a photon at 650 nm (reactions ( 7) and ( 8)).…”

Efficient White Electrochemiluminescent Emission From Carbon Quantum Dot Films

“…A potential scanning cycle from 0 to −3.0 V was performed on the CQD film shown in Figure 5 , where individual spectra were taken during this potential scan every 2 s (Hesari and Ding, 2016 ; Shu et al, 2017 ; Guo et al, 2018 ). Capturing spectrum during the scan (otherwise known as spooling spectroscopy), enables tracking the evolution/devolution of light emission processes during CV scans.…”

Photoinduced electrochemiluminescence at nanostructured hematite electrodes

“…ECL is a well-established analytical method, especially for immunoassays, and is emerging as a powerful imaging technique [4][5][6][7][8][9][10]. The majority of these applications relies on the use of model ECL luminophores such as the tris(bipyridine)ruthenium(II) ([Ru(bpy) 3 ] 2+ ) or luminol (3-aminophthalhydrazide) and their analogs [11][12][13][14][15][16][17][18][19][20][21][22]. For example, L-012 (8-amino-5-chloro-2,3-dihydro-7-phenyl-pyrido [3,4d]pyridazine-1,4-dione), a luminol-based analog, is widely used in vitro and in vivo to measure the activity of oxidase enzymes, to detect reactive oxygen species (ROS), and to measure different analytes at the cell level [23][24][25][26][27][28].…”