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Invisible NIR emission switching
The switching of near infrared light is a major challenge for various applications in the fields of information transport, medical imaging, detection or authentication of documents. Researchers from ISCR, Ecole Normale Supérieure de Lyon and Ecole Normale Supérieure de Paris-Saclay have succeeded for the first time in switching both optically and electrochemically a near infrared emission invisible to the naked eye. This was achieved thanks to the unique combination of a photochromic ligand, an organometallic antennae and an Ytterbium center. With this design, by changing the state of the ligand by either UV or visible irradiations, the emission in the near infrared can be quickly and effectively switched off or on at will. Moreover, the redox active organometallic antennae allows additional electrochemical switching and a unique multi-responsive system is thus obtained. This work, detailed in the Journal of The American Chemical Society, opens the way to new unprecedented applications.
Reference
H. Al Sabea, L. Norel, O. Galangau, H. Hijazi, R. Métivier, T. Roisnel, O. Maury, C. Bucher, F. Riobé, S. Rigaut, Dual Light and Redox Control of NIR Luminescence with Complementary Photochromic and Organometallic Antennae.
J. Am. Chem. Soc. (2019) 141, 20026-20030 - DOI: 10.1021/jacs.9b11318