Excitation-light-induced phosphorescent color changes of β-cyclodextrin inclusion complexes

Color tuning of organic materials is attractive field for both fundamental research and practical application. We report herein two new supramolecular materials based on beta-cyclodextrin inclusion complex samples with partially included organic guests, which emit dark-blue and near-white phosphorescence (excitation at 365 nm), and exhibit higher phosphorescent quantum yields (9.2-12.4%). However, purely organic molecules themselves emit green-yellow or blue phosphorescence, and possess low phosphorescent quantum yields (1.4-3.5%). The inclusion complex samples with partially included organic guests also exhibit phosphorescent color tunability which can emit dark-blue, blue, near-white or green light, when stimulated with different excitation lights. Such excitation-light-induced supramolecular phosphorescent materials are promising candidates for potential applications in the organic electronics and dynamically photofunctional materials. (C) 2013 Elsevier B.V. All rights reserved.