Multi-color-tunable ultra-long room temperature phosphorescence based on cyclodextrin metal–organic frameworks

Abstract

A series of multi-color persistent phosphorescent crystalline materials were constructed using the inherently green, heavy atom-free γ-cyclodextrin metal–organic frameworks through guest encapsulation. Owing to the macrocycles effectively suppressing guest aggregation and forming rigid environments via potassium ion assembly, the material exhibits a lifetime and phosphorescence quantum yield of 553 ms and 8.19%, respectively. Furthermore, upon encapsulation with commercial dyes such as sodium fluorescein and rhodamine B, full-color afterglow emissions were achieved through phosphorescence energy transfer. This work provides a universal method for designing and preparing environmentally friendly phosphorescent materials, overcoming the inherent limitations of degradation and recyclability in organic room-temperature phosphorescent compounds.