掺稀土元素Eu的MgSO_4热释发光谱研究

Thermoluminescence of MgSO_4 Doped with Eu Impurities

研制了ＣａＳＯ４：Ｅｕ和ＭｇＳＯ４：Ｅｕ磷光体，测量了６０Ｃｏγ射线辐照后的热释光三维发光谱．测到ＣａＳＯ４：Ｅｕ发光谱中有一个峰温为１４４℃，波长在３９０ｎｍ处Ｅｕ２＋离子能级跃迁产生的主发光峰．ＭｇＳＯ４：Ｅｕ同样有一个Ｅｕ２＋离子产生的主发光峰，峰温在１４６℃，但波长在４４０ｎｍ．同时还观测到Ｅｕ３＋的能级跃迁产生的波长为 ５９０ｎｍ和 ６２０ｎｍ，峰温约在 １４５℃．１９０ ℃，２６℃和 ３６０℃的 ４个强度较弱的发光峰．它们的峰温的分布与ＭｇＳＯ４：Ｄｙ的发光峰基本相同．结果表明，Ｅｕ３＋在不同硫酸盐中发光谱波长基本相同，而Ｅｕ２＋离子在不同硫酸盐中发光谱的波长与该材料的阳离子半径成反比．

The phosphors of CaSO4: Eu and MgSO4: Eu have been prepared. The thermoluminescence spectra were measured. The glow peak at - 144℃ about 390 nm from Eu2+ ions in the CaSO4: Eu and the glow peak at -46 ℃ about 440 nm from Eu2+ ions in the MgSO4: Eu are observed. The glow peaks at the temperatures- 145 ℃, - 190℃,-- 260℃ and - 360℃ about 590 nm and 620 nm are identified as Eu3+ ions transitions in the MgSO4: Eu. The temperature of these glow peaks is almost the same to that of the MgSO4: Dy. The results in this work show that the wavelength of the glow peak from Eu2+ ions in different sulfate is inverse proportional to the ra- dius of the cation of sulfates. However, the wavelengths of the glow peaks from Eu3+ in different matrix remain unchanged.