title: Polymorphism and reversible mechanochromic luminescence for solid-state difluoroboron avobenzone.
abstract: Difluoroboron avobenzone (BF(2)AVB), a simple boron complex of a commercial sunscreen product, exhibits morphology-dependent emission and mechanochromic luminescence in the solid state. When scratched, smeared, or even gently touched, the emission color of BF(2)AVB films is significantly red-shifted under UV excitation. In the rubbed regions, the fluorescence recovers slowly at room temperature or much faster with heating, resulting in a simple rewritable "scratch the surface" ink of potential commercial use.
authors.affiliation: Department of Chemistry, University of Virginia, Charlottesville, Virginia 22904, USA.
authors.forename: Guoqing
authors.initials: G
authors.lastname: Zhang
authors.forename: Jiwei
authors.initials: J
authors.lastname: Lu
authors.forename: Michal
authors.initials: M
authors.lastname: Sabat
authors.forename: Cassandra L
authors.initials: CL
authors.lastname: Fraser