The Columnar Liquid Crystal

Organic Light-Emitting Diodes Using Low-Molar-Mass Materials (LMMMs) 161 Table 5.5 Transition temperatures CC) for the columnar liquid crystals (17-21)... 

A further potential problem associated with the practical fabrication of multilayer OLEDs with low-molar-mass calamitic and columnar liquid crystals with a charge-transport layer, especially as the HTL, is the fluid nature of the liquid crystalline state. This could permit contamination of the columnar liquid crystal during the deposition of subsequent layers by the process of vapour deposition or spin-coating. The columnar materials could well be soluble in the solvent used to deposit the next layer. This would lead to chemical contamination of the individual layers due to mixing of one component into another, the... 

The columnar liquid crystal applications of the continuum theory 6.3.1 Fluctuations... 

Thus, in contrast to smectic A and the two-dimensional lattice, for which the displacement-displacement correlation is of logarithmic form, the columnar liquid crystal gives the usual Bragg reflexions. As noted in 6.1, this is borne out by high resolution X-ray experiments on well oriented monodomain discotic strands. 

Fig. 6.4.2 gives photographs of the columnar liquid crystal appearing in the isotropic phase as the sample is cooled slowly. The growth pattern reflects the hexagonal symmetry of the columnar mesophase. 

A. Patti, S. Belli, R. van Roij, M. Dijkstra, Relaxation dynamics in the columnar liquid crystal phase of hard platelets. Soft Matter 7, 3533-3545 (2011)... 

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