Rare earth doped materials are materials that contain rare earth elements such as lanthanides (e.g. europium, gadolinium, ytterbium) or actinides (e.g. uranium, thorium) incorporated into their structure. These materials are known for their unique optical, magnetic, and luminescent properties, making them desirable for a variety of applications in fields such as photonics, optoelectronics, and magnetic storage. Rare earth doped materials can be used as phosphors in lighting, displays, and sensors, as well as in lasers and amplifiers for telecommunications. The doping of these materials with rare earth elements allows for precise control over their properties, such as emission wavelength, intensity, and lifetime, making them highly tunable for specific applications. Overall, research in the area of rare earth doped materials is focused on understanding and optimizing their unique properties, as well as developing new synthesis methods and applications for these materials in various technologies.