Four phosphors CaSO4: Eu; MgSO4: Eu; MgSO4: Eu, Mn and MgSO4: Eu, P have been prepared and their thermoluminescence (TL) spectra were obtained. For MgSO4: Eu a main glow peak due to Eu2+ ions is seen at～144◦C and 440 nm while for CaSO4: Eu this occurs at～144◦C and 390 nm. Further MgSO4: Eu glow peaks at～145◦C; ～190◦C, ～260◦C and ～360◦C for 590 and 620 nm wavelengths are identi9ed as Eu3+ ion emissions. These characteristic glow peaks occur at almost the same temperatures as in MgSO4: Dy. In MgSO4: Mn glow peaks at 140◦C and 190◦C for a broad wavelengthband about 660 nm are seen from the Mn ions. When MgSO4 is co-doped withEu and Mn the Eu2+ and Eu3+ ion glow peaks are remarkably suppressed while the 660 nm broad emission band glow peaks at～140◦C and 190◦C remain withh ighintensity contributed from the Mn luminescence centers. Emission spectra in MgSO4: Eu and the MgSO4: Eu,P show that the MgSO4: Eu3+ glow peak at 260◦C for 590 and 620 nm shifts to 280◦C, while the Eu2+ ion glow peak at～144◦C remains but withreduced intensity. Thus, the effect of the P co-dopant in MgSO4: Eu,P is exactly similar to its role in MgSO4: Dy; P, i.e. shifting the 260◦C peak to 280◦C with enhanced intensity and suppressing the intensity of the other peaks. The main glow peak at～144◦C and 440 nm from Eu2+ ions shows significant difference from the characteristic glow peaks of Eu3+ ions. It is found that the wavelength of the Eu2+ ion glow peak is inversely proportional to the radius of the cation of the host sulfate. By contrast the wavelengths of the Eu3+ ion glow peaks remain unchanged in di=erent sulfates.