This book gives a thorough explanation of how RE3+ doped lanthanum silicate nanophosphors were made using a low temperature solution combustion process. La10Si6O27:RE3+ Characterization was studied XRD, SEM, TEM, DRS, FTIR and also applications studied Photoluminescence, Photocatalytic, Electrochemical and sensors. The lanthanum silicate is useful for waste water treatment and Sensor applications.