Year: 2026
Type: preprint
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.
Source: ChemRxiv
Institution: Johannes Gutenberg University Mainz
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W7221773932