Abstract
We saw in Chap. 5 that an STE in alkali halides can be described as an excited dimer (excimer), X2− 2, on the halide sublattice, generally accompanied by off-center relaxation of the excimer ion (X− 2) relative to the excited electron wave function. Partly because of the prominent nature of STE phenomena in alkali halides and related ionic crystals, one sometimes sees self-trapped excitons characterized as a phenomenon of ionic insulators. However, the experimental study of excimers in pure organic crystals actually predated their discovery in alkali halides by about 6 yr [8.1]. The organic excimers were not commonly called self-trapped excitons until the late 197O’s, when Matsui and Nishimura showed that excimer formation in a pure organic crystal is quite naturally described within the framework of exciton self-trapping [8.2]. Some of the experimental observations on excimers to be discussed bear an interesting resemblance to phenomena in alkali halides.
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© 1993 Springer-Verlag Berlin Heidelberg
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Song, K.S., Williams, R.T. (1993). Simple Organic Molecular Crystals. In: Self-Trapped Excitons. Springer Series in Solid-State Sciences, vol 105. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-97432-8_8
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DOI: https://doi.org/10.1007/978-3-642-97432-8_8
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