Due to the presence of a polarization-sensitive photonic band gap, cholesteric liquid crystals (CLCs) strongly modify the emission of fluorescent guest molecules, which makes them promising candidates for coherent or incoherent light sources with unique polarization properties. We present a systematic study of the angular dependent spontaneous emission properties of CLC films doped with a fluorescent dye. Our main findings are: (1) wavelength intervals of almost complete emission suppression due to the emergence of a polarizationinsensitive band gap at large detection angles; (2) additional band-edge resonance peaks almost completely dominating emission in certain angular ranges; and (3) striking angular and wavelength dependent polarization variations.
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