Photoinduced Electrochemiluminescence at Silicon Electrodes in Water

• DOI: 10.1021/jacs.9b06743
• Publication Date: 2019-08-02T19:14:38Z
• Authors: Yiran Zhao; Jing Yu; Guobao Xu; Neso Sojic; Gabriel Loget
• Keywords: Electrochemiluminescence; Photon Upconversion

We introduce the photoinduced electrochemiluminescence (P-ECL) of model ECL system involving simultaneous oxidation [Ru(bpy)3]2+ and tri-n-propylamine (TPrA). This classically requires highly anodic potentials greater than +1 V vs SCE for generation. In reported approach, emission is triggered by holes (h+) photogenerated in an n-type semiconductor (SC) electrode, which normally challenging because competing photocorrosion occurring on SC electrodes aqueous electrolytes. employ here Si-based tunnel protected few-nanometer-thick SiOx Ni stabilizing thin films demonstrate that this construct allows generation P-ECL water. based upconversion process where light absorption at 810 nm induces (635 nm) a record low electrochemical potential 0.5 SCE. Neither excitation wavelength nor applied able to stimulate if alone, but their synergetic action leads stable intense strategy can be extended other luminophores promising ultrasensitive detection light-addressable imaging devices.