title: NIR-light-induced deformation of cross-linked liquid-crystal polymers using upconversion nanophosphors.
abstract: When upconversion nanophosphors were incorporated into an azotolane-containing cross-linked liquid-crystal polymer film, the resulting composite film generated fast bending upon exposure to continuous-wave near-IR light at 980 nm. This occurs because the upconversion luminescence of the nanophosphors leads to trans-cis photoisomerization of the azotolane units and an alignment change of the mesogens. The bent film completely reverted to the initial flat state after the light source was removed.
authors.affiliation: Department of Materials Science, Fudan University, Shanghai 200433, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Wu
authors.forename: Liming
authors.initials: L
authors.lastname: Yao
authors.forename: Tianshe
authors.initials: T
authors.lastname: Yang
authors.forename: Ruoyuan
authors.initials: R
authors.lastname: Yin
authors.forename: Fuyou
authors.initials: F
authors.lastname: Li
authors.forename: Yanlei
authors.initials: Y
authors.lastname: Yu