Photoinduced Electrochemiluminescence at Silicon Electrodes in Water

Journal of the American Chemical Society
Yiran ZhaoGabriel Loget

Abstract

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

References

Nov 20, 2013·Accounts of Chemical Research·Kangning RenHongkai Wu
Aug 2, 2014·Chemical Reviews·Ke SunDeli Wang
Mar 2, 2017·Chemical Society Reviews·Dowon BaeIb Chorkendorff
May 10, 2018·The Analyst·Laura PowellWilliam O Osburn
Jun 14, 2018·Nature Communications·Stephen G ParkerJ Justin Gooding

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Citations

Jan 17, 2020·Angewandte Chemie·Weiliang GuoBin Su
May 27, 2020·Luminescence : the Journal of Biological and Chemical Luminescence·Mingxia SunYi Lv
Jan 8, 2021·Angewandte Chemie·Dongni HanNeso Sojic
Apr 8, 2021·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Abdulghani IsmailAurélie Bouchet-Spinelli
Jun 25, 2021·Accounts of Chemical Research·Xiangui MaGuobao Xu
Nov 5, 2019·Analytical Chemistry·Cheng MaJun-Jie Zhu
Dec 29, 2020·Journal of the American Chemical Society·Yaoguang WangQin Wei

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