title: Tailoring intermolecular interactions for efficient room-temperature phosphorescence from purely organic materials in amorphous polymer matrices.
abstract: Herein we report a rational design strategy for tailoring intermolecular interactions to enhance room-temperature phosphorescence from purely organic materials in amorphous matrices at ambient conditions. The built-in strong halogen and hydrogen bonding between the newly developed phosphor G1 and the poly(vinyl alcohol) (PVA) matrix efficiently suppresses vibrational dissipation and thus enables bright room-temperature phosphorescence (RTP) with quantum yields reaching 24%. Furthermore, we found that modulation of the strength of halogen and hydrogen bonding in the G1-PVA system by water molecules produced unique reversible phosphorescence-to-fluorescence switching behavior. This unique system can be utilized as a ratiometric water sensor.
authors.affiliation: Department of Materials Science and Engineering, University of Michigan (USA).
authors.forename: Min Sang
authors.initials: MS
authors.lastname: Kwon
authors.forename: Dongwook
authors.initials: D
authors.lastname: Lee
authors.forename: Sungbaek
authors.initials: S
authors.lastname: Seo
authors.forename: Jaehun
authors.initials: J
authors.lastname: Jung
authors.forename: Jinsang
authors.initials: J
authors.lastname: Kim
keywords: halogen bonds; hydrogen bonds; purely organic phosphors; room-temperature phosphorescence; water sensors