Calcium lanthanum sulfide is primarily utilized in the field of optoelectronics and material science due to its unique luminescent properties. It is often employed as a phosphor material in various lighting applications, including LEDs and display technologies, where it enhances color rendering and efficiency. Additionally, its ability to emit light in specific wavelengths makes it valuable in solid-state lighting and laser systems. In research, it is explored for its potential in advanced optical devices and sensors, particularly those requiring high sensitivity and stability under varying environmental conditions.