Used as a water-tolerant Lewis acid catalyst in organic synthesis, particularly in glycosylation reactions and Friedel-Crafts acylations. Its high solubility in both polar and nonpolar solvents makes it suitable for homogeneous catalysis in a wide range of reaction media.

Employed in electrochemical applications due to its ionic conductivity and stability, such as additives in electrolytes for lithium-ion batteries, solid-state batteries, fuel cells, and supercapacitors, enhancing charge rates, lifespan, and overall chemical stability.

Serves as a dopant in luminescent materials, including organic light-emitting diodes (OLEDs), organic transistors, and optical coatings, where lanthanum ions improve electrical conductivity and performance.