木质纤维素基近红外高透过滤光片

Near-infrared(NIR)filters have significant applications in fields such as privacy protection,environmental monitoring,and night vision;however,traditional filters rely on complex designs and environmentally harmful substrates,while lignocellulose-derived filters often fail to meet required blocking wavelengths.In this study,we introduce a lignin capturing-fusing strategy,where lignin self-assembles and fuses within a cellulose network to form a dense,stable structure.By simply adjusting the film thickness,we precisely control the wavelength-blocking capability of the filters.The resulting optical biofilters exhibit selective blocking in the visible region(400-650 nm),high NIR transmittance(over 90％),and low haze.Additionally,the optical biofilters show comprehensive stability,including water,solvent,thermal,and environmental stability.With these unique properties,the biofilters demonstrate great potential for applications in the NIR region,such as data security,privacy protection,and NIR night vision.