A Redox-Switchable NIR II-to-NIR II Photoluminescent Vanadium(III/II) Redox Couple
Abstract
Redoxluminochromic materials are useful for switchable optoelectronic devices that change the emission properties upon a redox stimulus. Typically, ON/OFF switches are realized, while materials with redox-induced changes of emission color are exceedingly rare. Here, we report a near-infrared II emissive vanadium(III) chromophore [V(tpe)2]3+ with an emission band peaking at 1110 nm. Its detailed photophysical properties including (ultrafast and long) excited state dynamics are elucidated by variabletemperature fs-ns transient absorption spectroscopy and luminescence spectroscopy. Together with its one-electron reduced counterpart [V(tpe)2]2+ (emission maximum at 1375 nm), we establish a proof-of-concept that d2/d3 spin-flip emitters can constitute redoxluminochromic materials, which switch luminescence from 1000–1200 nm to 1300–1600 nm in the very challenging near-infrared II spectral region.
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BibTeX
@misc{konigschafer2026redoxswitchable,
title = {{A Redox-Switchable NIR II-to-NIR II Photoluminescent Vanadium(III/II) Redox Couple}},
author = {Alexandra König-Schäfer and Robert Naumann and Christoph Förster and Jan Klett and Katja Heinze},
howpublished = {ChemRxiv},
year = {2026},
month = oct,
doi = {10.26434/chemrxiv.15010464/v1},
url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010464/v1},
note = {CC BY},
}
RIS
TY - UNPB
TI - A Redox-Switchable NIR II-to-NIR II Photoluminescent Vanadium(III/II) Redox Couple
AU - Alexandra König-Schäfer
AU - Robert Naumann
AU - Christoph Förster
AU - Jan Klett
AU - Katja Heinze
PY - 2026
DA - 2026/10/14
PB - ChemRxiv
DO - 10.26434/chemrxiv.15010464/v1
UR - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15010464/v1
AB - Redoxluminochromic materials are useful for switchable optoelectronic devices that change the emission properties upon a redox stimulus. Typically, ON/OFF switches are realized, while materials with redox-induced changes of emission color are exceedingly rare. Here, we report a near-infrared II emissive vanadium(III) chromophore [V(tpe)2]3+ with an emission band peaking at 1110 nm. Its detailed photophysical properties including (ultrafast and long) excited state dynamics are elucidated by variabletemperature fs-ns transient absorption spectroscopy and luminescence spectroscopy. Together with its one-electron reduced counterpart [V(tpe)2]2+ (emission maximum at 1375 nm), we establish a proof-of-concept that d2/d3 spin-flip emitters can constitute redoxluminochromic materials, which switch luminescence from 1000–1200 nm to 1300–1600 nm in the very challenging near-infrared II spectral region.
ER -