掺稀土元素Dy和Mn,P,Cu的MgSO4的热释发光光谱

实验测定了MgSO₄:Dy,Mn和MgSO₄:Dy,P以及MgSO₄:Dy,P ,Cu等的热释光磷光体的三维发光谱.结果表明，掺入Dy的MgSO₄磷光体的热释发 光谱线的波长与Dy³⁺离子的能级跃迁相关，Dy³⁺为热释光主要发光 中心.MgSO₄中只掺入Mn时，温度在140℃和190℃附近呈现波长为660nm宽范围的 连续发光带，这是Mn形成的发光中心的关键词：热释发光光谱稀土元素镝硫酸镁

THERMOLUMINESCENT SPECTRA OF MgSO4 DOPED WITH Dy AND Mn,P,Cu

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,Dy^{3+< /sup> 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.}