晶态四硼酸锶中二价镝的发射(英文)  

Emission from Divalent Dysprosium (Dy^(2+)) in Crystalline Strontium Tetraborate

作　　者：许武[1] Peterson J R 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130022 [2]Transuranium Research Laboratory (Chemical and Analytical Sciences Division),

出　　处：《发光学报》2001年第4期367-372,共6页Chinese Journal of Luminescence

基　　金：国家自然科学基金(59882006);吉林省科学基金(19990514)资助项目

摘　　要：在室温下测量了在空气中灼烧掺杂Ｄｙ２Ｏ３的ＳｒＢ４Ｏ７的发射光谱。观测到了由Ｄｙ３＋到Ｄｙ２＋氧化态的变化。经优化，当在空气中灼烧温度为６５０℃时为产生Ｄｙ２＋的最佳温度。在４５７．９ｎｍ的激发下测出了两个峰位分别位于５５０和６６０ｎｍ的宽发射带。我们认为这两个宽发射带是由Ｄｙ２＋离子由５ｄ态向４ｆ基态能级（５Ｉ８）跃迁产生的。讨论了几个有益于在这种基质中还原Ｄｙ３＋离子的条件。为了实现Ｄｙ３＋离子的还原，我们还在Ａｒ／Ｈ２（４％）气氛中制备了Ｄｙ２Ｏ３掺杂的ＳｒＢ４Ｏ７，比较了这种样品和在空气中所制备的样品的光学特性。本文还对标志ＳｒＢ４Ｏ７还原性和稳定性的ｇ－因子由Ｔｍ２＋的［Ｅ０（Ｔｍ３＋／Ｔｍ２＋＝－２．３Ｖ］推导出时Ｄｙ２＋的［Ｅ０（Ｄｙ３＋／Ｄｙ２＋）＝－２．６Ｖ］，但对这种还原过程的局限性尚未确定。Emission spectra from SrB4O7 doped with DyO3 and heated in air have been recorded at room temperature. A change in oxidation state from Dy3+ to Dy2+ was observed. Optimum production of Dy2+ ion occurs when the sample is heated in air at about 650℃. Two broad emis- sion bands centered in the vicinity of 550 and 660nm have been observed from the sample under the excitation of 457. 9nm. It is suggested that these bands are due to Dy2 + ion emission from the 5d band into the ground state 4f level (5I8). Several conditions promoting the reduction of Dy3+ ion in this matrix are discussed. To aid the reduction of Dy3+ ion, we have also prepared SrB4O7 doped with Dy2O3 in Ar/H2(4%) atmosphere and compared the optical characteristics of Dy2+ ion in these samples with those from the samples prepared in air. The range of g-element reducibility and stabilization in SrB4O7 has been extended from Tm2 + [E0 (Tm3 + /Tm2 + ) = - 2. 3V] to Dy2+ [E0(Dy3+/Dy2+) = - 2.6V] in the present work; however, the limit of this facile reduc- tion process has not been determined yet.

关 键 词：稀土离子发光 二价镝 SRB4O7 晶态四硼酸锶 发射 

分 类 号：O482.31[理学—固体物理] O614.232[理学—物理]