title: Nonvolatile liquid anthracenes for facile full-colour luminescence tuning at single blue-light excitation.
abstract: Nonvolatile room-temperature luminescent molecular liquids are a new generation of organic soft materials. They possess high stability, versatile optical properties, solvent-free fluid behaviour and can effectively accommodate dopant dye molecules. Here we introduce an approach to optimize anthracene-based liquid materials, focussing on enhanced stability, fluorescence quantum yield, colour tunability and processability, with a view to flexible electronic applications. Enveloping the anthracene core in low-viscosity branched aliphatic chains results in stable, nonvolatile, emissive liquid materials. Up to 96% efficient energy-transfer-assisted tunable emission is achieved by doping a minute amount of acceptor dye in the solvent-free state. Furthermore, we use a thermoresponsive dopant to impart thermally controllable luminescence colours. The introduced strategy leading to diverse luminescence colours at a single blue-light excitation can be an innovative replacement for currently used luminescent materials, providing useful continuous emissive layers in developing foldable devices.
authors.affiliation: National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba , Japan.
authors.forename: Sukumaran Santhosh
authors.initials: SS
authors.lastname: Babu
authors.forename: Martin J
authors.initials: MJ
authors.lastname: Hollamby
authors.forename: Junko
authors.initials: J
authors.lastname: Aimi
authors.forename: Hiroaki
authors.initials: H
authors.lastname: Ozawa
authors.forename: Akinori
authors.initials: A
authors.lastname: Saeki
authors.forename: Shu
authors.initials: S
authors.lastname: Seki
authors.forename: Kenji
authors.initials: K
authors.lastname: Kobayashi
authors.forename: Keita
authors.initials: K
authors.lastname: Hagiwara
authors.forename: Michito
authors.initials: M
authors.lastname: Yoshizawa
authors.forename: Helmuth
authors.initials: H
authors.lastname: Möhwald
authors.forename: Takashi
authors.initials: T
authors.lastname: Nakanishi