晶态四硼酸锶中二价镝的发射

在室温下测量了在空气中灼烧掺杂Dy2O3的SrB3O7的发射光谱。观测到了由Dy^3 到Dy^2 氧化态的变化。经优化，当在空气中灼烧温度为650℃时为产生Dy^2 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Dy^2 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Dy^3 离子的条件。为了实现Dy^3 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。本文还对标专SrB4O7还原性和稳定性的g－因子由Tm^2 的E0(Tm^3 /Tm^2 =-2.3V]推导出Dy^2 的E0(Dy^3 /Dy^2 )=-2.6V]，但对这种还原过程的局限性尚未确定。

Emission from Divalent Dysprosium (Dy2+ )in Crystalline Strontium Tetraborate

Emission spectra from SrB4O7 doped with Dy2O3 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 emission 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 reduction process has not been determined yet.