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Opt Express. 2004 May 3;12(9):2002-10.

High temperature-gradient refractive index liquid crystals.


We have analyzed the physical origins of the temperature gradient of the ordinary refractive index ( dn(o) /dT) of liquid crystals. To achieve a large dn(o) /dT , high birefringence and low clearing temperature play crucial roles. Based on these simple guidelines, we formulated two exemplary liquid crystal mixtures, designated as UCF-1 and UCF-2, and compared their physical properties with a commonly used commercial liquid crystal compound 5CB. The dn(o) /dT of UCF-1 is ~4X higher than that of 5CB at room temperature.

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