A series of magnesium borate phosphors MgB4O7:Dy, MgB4O7:Mn and MgB4O7:Dy,Mn were prepared and their ther-moluminescence (TL) emission spectra were measured. TL emission bands in 480, 575 and 660 nm at 200 and 360 oC were observed in the MgB4O7:Dy due to the transitions of the trivalent rare earth ions Dy3+. The glow peaks of broad wavelength band around~580 nm at 180 and~290 oC were observed in MgB4O7:Mn due to the emission of Mn2+ions. The main glow peak of MgB4O7 co-doped with Dy and Mn appeared in 580 nm at~360 oC. When MgB4O7 was co-doped with Dy (0.5 mol.%) and different concentrations of Mn (0.01 mol.%-1.0 mol.%), the peak in 580 nm at 360 °C was intensified and broadened as the concentration of Mn increased, while the peaks in 480, 680 and 750 nm below 300 °C remained the characteristic emission of Dy3+and were reduced in intensity. The emission spectra of the MgB4O7:Dy,Mn phosphor showed that the competitive de-excitation processes between Dy3+and Mn2+existed and the energy transfer occurred from Dy3+to Mn2+. These results meant that rare earth and Mn ions in MgB4O7:Dy,Mn might cause the formation of defects complex that dominated the traps and recombination.
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