Double response reversible phosphorescence based on cyclodextrin supramolecular flexible elastic achieved multicolor delayed fluorescence

Abstract

Purely organic room-temperature phosphorescence (RTP) is current hotspot in the research fields of chemistry, biology, materials etc. Herein, we report that photo-thermal double response reversible ultralong RTP flexible elastic material with multicolor delayed fluorescence, which is constructed by 4-biphenylboronic acid (BOH), polyethylene glycol, 2,2-bis(hydroxymethyl)propionic acid, isophorone diamine and isophorone diisocyanate copolymer. Importantly, the supramolecular phosphorescent elastomer not only exhibits extending RTP emission with a lifetime up to 1.21 s, but also gives a visible afterglow of 20 s via encapsulation of BOH unities by the deep cavities of hydroxypropyl-β-cyclodextrin (β-CD-HP) and in situ polymerization. Especially, after doping organic dyes (Fluorescein isothiocyanate, Sulforhodamine 101, Rhodamine B), supramolecular phosphorescent elastomer achieves multicolor delayed fluorescence realized by RTP energy transfer from phosphorescent donor to dye acceptors, which possesses reversible photo-thermal responsiveness and maintains high effi-ciency in delayed emission even after dozens of cycles. Present research provides a new approach for constructing multicolor delayed fluorescent supramolecular elastomers.