Low-temperature properties of nematic liquid crystal materials for display

High birefringence liquid crystals with a wide temperature range and low melting point for augmented reality displays

“…Four traditional spectral methods were used, including 1 H-nuclear and 13 C-nuclear magnetic resonance ( 1 H NMR and 13 C NMR) spectra (ECZ400R/S1, Nippon Electronics Co), Fourier transform infrared spectrometry (IR, FTIR Tensor27, Brucker, Germany) and gas phase mass spectrometry (GC-MS, DSQ II, Thermo Fisher Scientific Co., LTD). High performance liquid chromatography (HPLC, LC-20AT, Shimadzu International Trading Co., LTD) and gas chromatography (GC, GC-2014C, Shimadzu, Japan) were employed to detect the purities of the target compounds and intermediates.…”

“…Classical organic synthetic reactions were employed in the above route to ensure the fast and efficient synthesis of target compounds; the synthesis processes and characterized data are shown in the supporting information. All target molecules and intermediate compounds were characterized and confirmed by 1 H NMR spectroscopy, 13 C NMR spectroscopy, mass spectroscopy and infrared spectroscopy.…”

“…Broad temperature adaptability is a key performance evaluator for the widespread applications of all optoelectronic devices, which have attracted significant attention in various fields, such as proton exchange membrane fuel cells, 1,2 perovskite solar cells, 3,4 lithium ion batteries, [5][6][7] supercapacitors, 8,9 and liquid crystal (LC) devices. [10][11][12][13] Augmented reality (AR) displays, one of the emerging research hotspots of LC devices, [14][15][16][17] are subject to device failure at low temperature resulting from the temperature-dependent properties of the LC materials used in AR displays. Therefore, there is an urgent need to find effective ways to lower the working temperature of LC devices to enhance their ambient temperature tolerance.…”