Abstract
We have investigated the optical absorption (OA) and photoluminescence (PL) spectra of C 70 /porous-glass (PG) composite at room temperature, comparing with C 70 -solution and C 70 film. The composite shows remarkably enhanced PL. The PL spectrum of C 70 /PG composite is accompanied by several molecular-vibronic side bands of isolated C 70 molecule. From the time-resolved photoluminescence (TRPL) spectra of the C 70 /PG composite, the spectral distribution and lifetime show two different relaxation processes. The obtained results are analyzed by taking into account the thermally-activated delayed fluorescence. The long lifetime component of the PL may arise from interactions between C 70 molecules and porous wall of PG. This interaction is responsible for the observed PL enhancement.
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