A study of resonant cavity-enhanced light-emitting diodes based on a columnar liquid crystal was presented in this article. An organic layer made of the electroluminescent liquid crystal was sandwiched between a Bragg mirror deposited on a silicon substrate and a semitransparent top electrode. The fabrication of the substrates was complementary metal oxide semiconductor compatible, the maximum electroluminescence intensity was enhanced by a factor of 3–4, and the spectral width of the emission could be reduced down to 18 nm, thereby improving the chromaticity coordinates, considerably
The liquid crystalline organic semiconductor perylene-3,4,9,10-tetracarboxylic-tetraethylester is used to create resonant cavity enhanced organic light emitting diodes. The results indicate that the emitted intensity can be increased and the emission spectrum narrowed by embedding a suitable sequence of several organic layers, including the discotic liquid crystal, with appropriate thicknesses in a microresonator consisting of a highly reflecting metal electrode and a Bragg reflector. The experimental data are in good agreement with theoretical calculations. Resonant cavity enhancement revealed to be suitable for improving the performance of liquid crystal-based electroluminescent devices.
The electrooptic characteristics of the field-induced reorientation of a nematic liquid crystal are studied using graphene layers as transparent conductive electrodes. The covering of a large area with highly conductive graphene was achieved by the thermal reduction of a graphene oxide film. The conductivity of the graphene electrode provides electrooptic properties that are comparable to those of liquid crystal cells with two conventional indium tin oxide electrodes. This result confirms earlier studies and suggestions concerning graphene-based liquid crystal devices. It demonstrates that the fabrication of graphene layers via the deposition and subsequent reduction of graphene oxide is suitable for liquid crystal applications.
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