Highly anisotropic films of needle-like crystallinepara-sexiphenyl (PSP)—a promising candidate for the electroactive layer in organic light-emitting diodes (LEDs)—can be produced using hot-wall epitaxy, as demonstrated here (see Figure). Optical dichroic ratios of ≈11 in absorption and up to 14 in emission are measured, which is of great significance for the development of polarized LEDs.
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Andreev et al. (2000) studied this question.