Ultrathin near-infrared transmitting films enabled by deprotonation-induced intramolecular charge transfer of a dopant.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39294190.
- Also identified by DOI 10.1038/s41467-024-52552-7 and PMC identifier 11410928.
- Licence recorded as CC BY-NC-ND.
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Abstract
Near-infrared transparent films demonstrate important applications in many fields, but how to eliminate light interference from ultraviolet-visible region and how to tackle the trade-off effect between film thickness and transmittance remain as challenges. Herein, we report a near-infrared transparent film that achieves high-efficient combination of thin thickness (16 μm), suitable cut-off wavelength (890 nm), and ideal transmittance (T<sub>NIR</sub> > 90%, T<sub>Vis</sub> < 1%). Moreover, the film is photo-chemically stable, heating resistance and moisture insensitive. The key component of the film is a complex of a specially designed boron compound containing a perylene monoimide unit (PMI-CBN) with an organic base 1,8-diazabicyclo[5,4,0]undec-7-ene. The complex depicts red-shifted absorption from 709 to 943 nm owing to deprotonation of the N-H group of PMI-CBN. Dispersion of the complex in polymethyl methacrylate results in the high-performance film. As demos, the film is successfully used for night vision imaging and information encryption.