Lanthanide iodides are a series of chemical compounds formed by the combination of lanthanide elements with iodine. These compounds exhibit unique optical properties due to the lanthanide ions' electronic configurations, which allow for significant absorption and emission in the visible spectrum. They find applications in various fields such as luminescent materials, photovoltaic devices, and sensors. The use of these compounds can enhance the efficiency and performance of lighting and display technologies owing to their high quantum yield and stability under ambient conditions. Additionally, lanthanide iodides are crucial for developing new types of optical fibers and lasers due to their excellent emission characteristics and broad spectral ranges.