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1 November 1997 Anomolous white photoluminescence from C60-based composite films: emission characteristics and structural properties
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To investigate the possibility of fullerenes as new photofunctional materials making use of their unique molecular and electronic structures, we fabricated composite films consisting of vacuum deposited C60 and sputtered Si, where each layer was alternately and repeatedly deposited. We found that, under green laser irradiation, the composite films emit intense white light that is visible by naked eyes. The emission spectra as revealed by FT-IR spectrophotometry were very broad with no characteristic structures, extending from the visible to mid-IR. The peak position was in the range 1.8-2.3 micrometers , and the spectral shape gave almost perfect fit to the Plank's formula for black-body radiation in the almost entire wavelength range measured. Estimation based on the curve fitting gave surprisingly high effective black-body temperatures in the range 1100-1600 K, depending on the excitation intensity used. In spite of their far exceeding the sublimation temperature of C60 under vacuum, the emission is stable at least for hours. To obtain more insight into this extraordinary emission behavior, we carried out morphological and analytical studies on the emissive and non-emissive spots in the films by optical micrography, AFM, and microscope FT-IR transmittance spectroscopy. The results suggest the involvement of some peculiar microscopic morphology of the composite films in the occurrence of the intense white photoluminescence.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ching-ju Wen, Satomi Ohnishi, and Nobutsugu Minami "Anomolous white photoluminescence from C60-based composite films: emission characteristics and structural properties", Proc. SPIE 3142, Fullerenes and Photonics IV, (1 November 1997);

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