Thermoluminescent spectra of MgSO4 doped with Dy and Mn, P, Cu

Thermoluminescent 3D spectra of MgSO4 doped with Dy and Mn,P,Cu were measur ed. It is observed that the spectral wavelengths of MgSO4:Dy are related to the energy transitions of Dy3+ ions which play the role of luminescent cen ters. The glow peaks at 140 degrees C and 190 degrees C about 660 nm broad wavelength band were observed in MgSO4 doped with Mn. It means that Mn prom otes to form the new luminescent centers. When MgSO4 was co-doped with Dy a nd Mn,the main glow peak occurred at 380 degrees C in 480 nn and 580 nm wav elengths and the glow peaks in 480 nm and 580 nm below 300 degrees C and al l glow peaks in 660 nm are strongly suppressed. The emission spectra of the MgSO4:Dy,Mn phosphor show the characteristic wavelengths of Dy3+ ions. The refore, Dy3+ ions remain the major luminescent centers and Mn plays an impo rtant role for energy transfer to the Dy ions in the MgSO4:Dy,Mn phosphor. Comparing the 3D glow curves between MgSO4:Dy and MgSO4:Dy,P shows that the 260 degrees C glow peak of MgSO4:Dy shifts to 283 degrees C with high inte nsity while the temperature of glow peak at 360 degrees C remains unchanged . The relative intensities of glow peaks between 480 nm band and 580 nm ban d have been altered while the temperature of 283 degrees C glow peak is unc hanged after MgSO4 was codoped with Dy and P,Cu.