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Luminescence amplification at BiVO4 photoanodes by photoinduced electrochemiluminescence

Abstract : Photoinduced electrochemiluminescence (PECL) combines semiconductor (SC) photoelectrochemistry with electrochemiluminescence (ECL). In PECL, the incident light is converted to a different wavelength by an electrochemical reaction at a SC photoelectrode and allows to trigger ECL at unprecedented low potentials. This concept has been employed so far to design up-conversion systems using Si or III-V SCs. Nevertheless, PECL strongly suffers from the photoelectrochemical instability of these low bandgap SCs. Here, we report for the first time an original light conversion strategy based on PECL of a luminol derivative (L-012) at BiVO 4 photoanodes in water. An incident light photo-excites simultaneously the L-012 fluorescence and the photoanode. However, the resulting fluorescence signal is surpassed by the PECL emission. In addition, we show that, with this system, PECL can be induced at a potential as low as -0.4 V for several hours and that it can be employed to finely tune L-012 luminescence. This remarkable light enhancement and the record low applied potential are promising for the design of new analytical strategies and light-addressable systems.
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Submitted on : Tuesday, May 19, 2020 - 4:18:17 PM
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Sojic et al-2020-Luminescence ...
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Neso Sojic, Jing Yu, Hiba Saada, Rawa Abdallah, Gabriel Loget. Luminescence amplification at BiVO4 photoanodes by photoinduced electrochemiluminescence. Angewandte Chemie International Edition, Wiley-VCH Verlag, 2020, 59 (35), pp.15157-15160. ⟨10.1002/anie.202004634⟩. ⟨hal-02563400⟩



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