Concepedia

Abstract

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.