Photoluminescence of Layered Potassium Niobates (K4Nb6O17 and KNb3O8) and Effects of Hydration and H+-exchange on the Luminescence Properties
KNb3O8 showed blue luminescence of 450 nm at 300 K. The emission spectra of K4Nb6O17 and KNb3O8 at 77 K were red-shifted by H2O intercalation and H+-exchange, indicating that the photochemical properties of these hosts were changed with interlayer conditions.