Abstract
X-ray absorption near-edge structure (XANES) and x-ray excited optical luminescence (XEOL) have been used to study the optical properties of 2,5,8,11-tetra-tert-butylperylene (TBPe) polyhedral crystals with morphology varies from cube to rhombic dodecahedron. Benefit from the high resolution of synchrotron radiation spectroscopy, C 1s to π∗ and σ∗ transitions from different carbon sites in TBPe can be clearly distinguished in the carbon K-edge XANES. XEOL studies reveal that different crystals exhibit multiple emission bands with different branching ratio. It is also found that all the polyhedral crystals exhibit a weak luminescence in the near infrared, which is absent in the powder sample.
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