title: Stimuli-Responsive Reversible Fluorescence Switching in a Crystalline Donor-Acceptor Mixture Film: Mixed Stack Charge-Transfer Emission versus Segregated Stack Monomer Emission.
abstract: We report on a molecularly tailored 1:1 donor-acceptor (D-A) charge-transfer (CT) cocrystal that manifests strongly red-shifted CT luminescence characteristics, as well as noteworthy reconfigurable self-assembling behaviors. A loosely packed molecular organization is obtained as a consequence of the noncentrosymmetric chemical structure of molecule A1, which gives rise to considerable free volume and weak intermolecular interactions. The stacking features of the CT complex result in an external stimuli-responsive molecular stacking reorganization between the mixed and demixed phases of the D-A pair. Accordingly, high-contrast fluorescence switching (red↔blue) is realized on the basis of the strong alternation of the electronic properties between the mixed and demixed phases. A combination of structural, spectroscopic, and computational studies reveal the underlying mechanism of this stimuli-responsive behavior.
authors.affiliation: Center for Supramolecular Optoelectronic Materials, Department of Materials Science and Engineering, Seoul National University, ENG 445, Seoul 151-744 (Korea).
authors.forename: Sang Kyu
authors.initials: SK
authors.lastname: Park
authors.affiliation: Center for Supramolecular Optoelectronic Materials, Department of Materials Science and Engineering, Seoul National University, ENG 445, Seoul 151-744 (Korea).
authors.forename: Illhun
authors.initials: I
authors.lastname: Cho
authors.affiliation: Madrid Institute for Advanced Studies, IMDEA Nanoscience, C/Faraday 9, Ciudad Universitaria de Cantoblanco, 28049 Madrid (Spain).
authors.forename: Johannes
authors.initials: J
authors.lastname: Gierschner
authors.affiliation: Center for Supramolecular Optoelectronic Materials, Department of Materials Science and Engineering, Seoul National University, ENG 445, Seoul 151-744 (Korea).
authors.forename: Jin Hong
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Center for Supramolecular Optoelectronic Materials, Department of Materials Science and Engineering, Seoul National University, ENG 445, Seoul 151-744 (Korea).
authors.forename: Jong H
authors.initials: JH
authors.lastname: Kim
authors.affiliation: Center for Supramolecular Optoelectronic Materials, Department of Materials Science and Engineering, Seoul National University, ENG 445, Seoul 151-744 (Korea).
authors.forename: Ji Eon
authors.initials: JE
authors.lastname: Kwon
authors.affiliation: Center for Supramolecular Optoelectronic Materials, Department of Materials Science and Engineering, Seoul National University, ENG 445, Seoul 151-744 (Korea).
authors.forename: Oh Kyu
authors.initials: OK
authors.lastname: Kwon
authors.affiliation: Center for Supramolecular Optoelectronic Materials, Department of Materials Science and Engineering, Seoul National University, ENG 445, Seoul 151-744 (Korea).
authors.forename: Dong Ryeol
authors.initials: DR
authors.lastname: Whang
authors.affiliation: Center for Supramolecular Optoelectronic Materials, Department of Materials Science and Engineering, Seoul National University, ENG 445, Seoul 151-744 (Korea).
authors.forename: Jung-Hwa
authors.initials: JH
authors.lastname: Park
authors.affiliation: Department of Chemistry, The Catholic University of Korea, Bucheon-si, Geyonggi-do 420-753 (Korea).
authors.forename: Byeong-Kwan
authors.initials: BK
authors.lastname: An
authors.affiliation: Center for Supramolecular Optoelectronic Materials, Department of Materials Science and Engineering, Seoul National University, ENG 445, Seoul 151-744 (Korea). parksy@snu.ac.kr.
authors.forename: Soo Young
authors.initials: SY
authors.lastname: Park
keywords: charge-transfer complex; fluorescence switching; self-assembly; supramolecular chemistry