title: Multistimuli two-color luminescence switching via different slip-stacking of highly fluorescent molecular sheets.
abstract: Color tuning and switching of the solid-state luminescence of organic materials are attractive subjects for both the fundamental research and practical applications such as optical recording. We report herein cyanostilbene-based highly luminescent molecular sheets which exhibit two-color fluorescence switching in response to pressure, temperature, and solvent vapor. The origin for the multistimuli luminescence switching is the two-directional shear-sliding capability of molecular sheets, which are formed via intermolecular multiple C-H···N and C-H···O hydrogen bonds. The resulting two distinctive crystal phases are promoted by different modes of local dipole coupling, which cause a substantial alternation of π-π overlap. These changes can be directly correlated with the subsequent intermolecular excitonic and excimeric coupling in both phases, as demonstrated by an in-depth theory-assisted spectroscopic and structural study. Finally, we have prepared a first device demonstrator for rewritable fluorescent optical recording media which showed multistimuli luminescence tuning with fast response. Our multistimuli responsive system is unique in terms of the slip-stacking of molecular sheets and thus provides a novel concept of rewritable fluorescent optical recording media.
authors.affiliation: Center for Supramolecular Optoelectronic Materials and WCU Hybrid Materials Program, Department of Materials Science and Engineering, Seoul National University, ENG 445, Seoul 151-744, Korea.
authors.forename: Seong-Jun
authors.initials: SJ
authors.lastname: Yoon
authors.forename: Jong Won
authors.initials: JW
authors.lastname: Chung
authors.forename: Johannes
authors.initials: J
authors.lastname: Gierschner
authors.forename: Kil Suk
authors.initials: KS
authors.lastname: Kim
authors.forename: Moon-Gun
authors.initials: MG
authors.lastname: Choi
authors.forename: Dongho
authors.initials: D
authors.lastname: Kim
authors.forename: Soo Young
authors.initials: SY
authors.lastname: Park
mesh_terms: D003116:Color; D005456:Fluorescent Dyes / Q000138:chemical synthesis / Q000737:chemistry*; D006860:Hydrogen Bonding; D049449:Luminescence; D015394:Molecular Structure; D010316:Particle Size; D011789:Quantum Theory; D013267:Stilbenes / Q000138:chemical synthesis / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D005456:Fluorescent Dyes; D013267:Stilbenes