Abstract
A study is reported of the spectral characteristics of two-photon-excited luminescence of polycrystalline samples of anthracene, diphenyl, and fluorene. The luminescence spectra recorded under two-photon, one-photon, and x-ray excitation conditions were compared. Considerable differences between these spectra were found. The main factors influencing the nature of the two-photon-excited luminescence spectra are reabsorption, surface energy states, and transition from spontaneous luminescence to superluminescence.
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