掺稀土元素Dy和Mn,P,Cu的MgSO_4的热释发光光谱

THERMOLUMINESCENT SPECTRA OF MgSO_4 DOPED WITH Dy AND Mn,P,Cu

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 6 6 0nm宽范围的连续发光带 ,这是Mn形成的发光中心的光谱 .当MgSO4 中同时掺入Dy和Mn时 ,6 6 0nm的Mn发光带和低于 30 0℃的Dy3 + 离子的发光谱强度均受到抑制 ,出现了波长为 480nm和 5 80nm峰温在 380℃的主发光峰 .这表明原MgSO4 :Dy的 36 0℃发光峰向高温方向移动了约 2 0℃ ,Dy3 + 仍为热释光主要的发光中心 ,Mn则主要起能量转移的作用 .MgSO4 :Dy ,P热释光三维发光谱可看出 ,P掺入使MgSO4 :Dy的 2 6 0℃发光峰移至 2 83℃ ,并且强度大大增加 ,原 36 0℃发光峰的峰温基本不变 .当MgSO4 :Dy ,P中同时掺入Cu时 ,主要发光峰的峰温仍在 2 83℃ ,但 36 0℃发光峰的强度被抑制 ,480nm和5 80nm的发光峰的相对强度发生了变化 .因此 ,Dy3 + 仍是热释光主要的发光中心 ,P和Cu参与形成新的俘获中心 .

Thermoluminescent 3D spectra of MgSO\-4 doped with Dy and Mn,P,Cu were measured.It is observed that the spectral wavelengths of MgSO\-4:Dy are related to the energy transitions of Dy 3+ ions which play the role of luminescent centers.The glow peaks at 140℃ and 190℃ about 660?nm broad wavelength band were observed in MgSO\-4 doped with Mn.It means that Mn promotes to form the new luminescent centers.When MgSO\-4 was co\|doped with Dy and Mn,the main glow peak occurred at 380℃ in 480?nm and 580?nm wavelengths and the glow peaks in 480?nm and 580?nm below 300℃ and all glow peaks in 660?nm are strongly suppressed.The emission spectra of the MgSO\-4:Dy,Mn phosphor show the characteristic wavelengths of Dy 3+ ions.Therefore,Dy 3+ ions remain the major luminescent centers and Mn plays an important role for energy transfer to the Dy ions in the MgSO\-4:Dy,Mn phosphor.Comparing the 3D glow curves between MgSO\-4:Dy and MgSO\-4:Dy,P shows that the 260℃ glow peak of MgSO\-4:Dy shifts to 283℃ with high intensity while the temperature of glow peak at 360℃ remains unchanged.The relative intensities of glow peaks between 480?nm band and 580?nm band have been altered while the temperature of 283℃ glow peak is unchanged after MgSO\-4 was codoped with Dy and P,Cu.