Anthracene crystals doped with 2-aminoanthracene give low temperature guest absorption and emission spectra which show the presence of two distinct types of trap, corresponding to different orientations of the guest in the host lattice. 1-Aminoanthracene gives similar results. Steric strain, exciton polarization, exciton-phonon coupling and host-to-guest energy transfer all depend strongly on guest orientation, but in different ways.
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Bridge et al. (1974) studied this question.