High Performance of the Electrically Controlled Birefringence Mode in Solution-Derived La₂O₃Film Using Low Temperature

We demonstrated the electro-optical characteristics of multi-stacked solution-derived La2O3 films in low temperature. Uniform and homogeneous liquid crystal (LC) alignment was achieved, and the films showed high performance. The electro-optic characteristics of the electrically controlled birefringence (ECB) mode with La2O3 layers were comparable to layers derived from polyimide, which indicated that La2O3 film had potential as an alignment layer due to its low threshold voltage (1.70 V) and fast response time (3.17 ms). The LC alignment on the solution-derived La2O3 surfaces was attributed to Van der Waals forces between LC molecules and La2O3 films. X-ray photoelectron spectroscopy demonstrated that the number of layers of coating changed the chemical structure, thereby shifting the binding energy and altering the bonding intensity.