Asymmetrically substituted perylene imide derivatives PIa and PIx display phosphorescence in glassy matrices at 77 K. The lifetime is 49.0 ms for PIa and 13.5 ms for PIx. The triplet energy is 1.79 eV for PIa and 1.68 eV for PIx as confirmed by sensitization experiments of the C60 triplet.
B. Ventura, H. Langhals, B. Böck and L. Flamigni, Chem. Commun., 2012, 48, 4226 DOI: 10.1039/C2CC30948C
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