In:
Angewandte Chemie, Wiley, Vol. 134, No. 20 ( 2022-05-09)
Abstract:
Photoinduced electrochemiluminescence (PECL) allows the electrochemically assisted conversion of low‐energy photons into high‐energy photons at an electrode surface. This concept is expected to have important implications, however, it is dramatically limited by the stability of the surface, impeding future developments. Here, a series of metal‐insulator‐semiconductor (MIS) junctions, using photoactive n ‐type Si ( n ‐Si) as a light absorber covered by a few‐nanometer‐thick protective SiO x /metal (SiO x /M, with M=Ru, Pt, and Ir) overlayers are investigated for upconversion PECL of the model co‐reactant system involving the simultaneous oxidation of tris(bipyridine)ruthenium(II) and tri‐n‐propylamine. We show that n ‐Si/SiO x /Pt and n ‐Si/SiO x /Ir exhibit high photovoltages and record stabilities in operation (35 h for n ‐Si/SiO x /Ir) for the generation of intense PECL with an anti‐Stokes shift of 218 nm. We also demonstrate that these surfaces can be employed for spatially localized PECL. These unprecedented performances are extremely promising for future applications of PECL.
Type of Medium:
Online Resource
ISSN:
0044-8249
,
1521-3757
DOI:
10.1002/ange.v134.20
DOI:
10.1002/ange.202201865
Language:
English
Publisher:
Wiley
Publication Date:
2022
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