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The photoluminescence spectra were recorded, in α-quaterthiophene (α-4T) single crystal, for visible and UV excitation light. The latter exhibits a blueshift of about 5meV with respect to the former. This value is comparable to the Van Der Waals energy. Delayed Fluorescence (DF), in α-quaterthiophene (α-4T) single crystal, was observed at room temperature. The delayed fluorescence emitted is explained...
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