Thermoluminescent 3D spectra of MgSO4 doped with Dy and Mn,P,Cu were measured.It is observed that the spectral wavelengths of MgSO4:Dy are related to the energy transitions of Dy3+ ions which play the role o f luminescent centers.The glow peaks at 140℃ and 190℃ about 660nm broad wavele ngth band were observed in MgSO4 doped with Mn.It means that Mn promo tes to form the new luminescent centers.When MgSO4 was co-doped with Dy and Mn,the main glow peak occurred at 380℃ in 480nm and 580nm wavelengths an d the glow peaks in 480nm and 580nm below 300℃ and all glow peaks in 660nm are strongly suppressed.The emission spectra of the MgSO4:Dy,Mn phosphor show the characteristic wavelengths of Dy3+ ions.Therefore,Dy3+ ions remain the major luminescent centers and Mn plays an important role f or energy transfer to the Dy ions in the MgSO4:Dy,Mn phosphor.Compari ng the 3D glow curves between MgSO4:Dy and MgSO4:Dy,P show s that the 260℃ glow peak of MgSO4:Dy shifts to 283℃ with high inte nsity while the temperature of glow peak at 360℃ remains unchanged.The relative intensities of glow peaks between 480nm band and 580nm band have been altered w hile the temperature of 283℃ glow peak is unchanged after MgSO4 was codoped with Dy and P,Cu.
下载:
