Abstract
Long-lived phosphorescence is demonstrated with an emission lifetime of 22.4 s at room temperature from coronene-d 12 encapsulated in the zeolitic imidazolate framework ZIF-8. The guest emitter coronene-d 12 is well isolated in the rigid framework of ZIF-8, enabling long-lived triplet excitons even at higher than 300 K. It is also demonstrated that thermally activated delayed fluorescence can be achieved at temperatures >300 K.
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