The overlooked NIR luminescence of Cr(ppy) 3 .

Laura SteinPit BodenRobert NaumannChristoph FörsterGereon Niedner-Schatteburg Katja Heinze

Published in: Chemical communications (Cambridge, England) (2022)

Cr(ppy) 3 , a structural analog of the green phosphorescent Ir(ppy) 3 , emits even in solution at room temperature from a weakly distorted spin-flip state at 910 nm (Hppy = 2-phenylpyridine). The low energy arises from an enhanced covalence of the Cr-C bonds as compared to Cr-N bonds. Lower temperature reduces thermally activated decay increasing the emission intensity.

Keyphrases

room temperature
light emitting
photodynamic therapy
ionic liquid
high intensity
quantum dots
transition metal