Tunable White Light Emission of a Metal-Organic Framework Based on a Bisquinoxaline Derivative by Introducing Red-Green Cationic Dyes

Ananionic MOF consisting of a bisquinoxaline derivativecould encapsulate cationic dyes to exhibit white light emission. The unique structural advantages give metal-organicframeworks(MOFs) a special use as host substrates to encapsulate organic dyes,which would result in specific host-guest composites for white-lightphosphors. In this work, an anionic MOF exhibiting blue emission wasconstructed using bisquinoxaline derivatives as photoactive centers,which could effectively encapsulate rhodamine B (Rh B) and acriflavine(AF) to form an In-MOF & SUP; Rh B/AF composite. By simply adjustingthe amount of Rh B and AF, the emitting color of the resulting compositecould be easily adjusted. The formed In-MOF & SUP; Rh B/AF compositeexhibits broadband white light emission with ideal Commission Internationaled'Eclairage (CIE) coordinates of (0.34, 0.35), a color renderingindex of 80.8, and a moderately correlated color temperature valueof 5193.96 K. This strategy can be easily extended to other blue-emittingMOFs and dyes, thus opening up new prospects for the development ofwhite-light-emitting materials.