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PROBLEM TO BE SOLVED : To provide an illuminant which exhibits enhanced illumination brightness and can be used stably. SOLUTION : An oxide layered illuminant comprises layered oxide crystals represented by the following general formulae (1) and (2) with a luminescent center (Ln) doped in the crystalline structure, wherein the oxide nanosheet illuminant of the formula (2) comprises a monolayered nanosheet obtained from the layered oxide crystal of formula (1). In the formulae (1) AyLn1-xM2O7and (2) Ln1-xM2O7, A is an alkaline metal or hydrogen, 0≤y≤2, Ln is a rare earth element constituting a luminescent center, Mn is tantalum or niobium, O is oxygen, 0≤xCOPYRIGHT : (C)2009, JPO&INPIT