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Eu2+在磷酸镧中的发光及Ce3+→Eu2+的能量传递 总被引:7,自引:2,他引:5
采用高温固相反应合成了LaPO4:Eu2+和LaPO4:Ce3+,Eu2+样品,报道了Eu2+在LaPO4中的发光性质和Ce3+→Eu2+的能量传递现象。文中探讨了Ce3+→Eu2+的能量传递机理,根据Dexter电多极相互作用的理论证明其为偶极子偶极子相互作用的共振能量传递。 相似文献
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BaFBr:Eu^2 是利用色心存储电子-空穴对并用可见光激励读出存储信息(产生Eu^2 的4f^65d→4f^7的跃迁)的优良的光激励发光材料。通过热释发光技术研究了BaFBr:Eu^2 的热激活行为,对其低温段和高温段的热释发光峰分别进行了归属,通过对BaFBr:Eu^2 以及掺杂Na^ 或Al^3 的BaFBr:Eu^2 的热释发光(TL)谱和光激励发光(PSL)谱的表征,指出在BaFBr:Eu^2 中掺杂Na^ 或Al^3 影响了F(Br^-)色心,使其陷阱深度变涛,并从理论上加以计算,得出的热致激发能量的变化与光致激光能量的变化能很好地吻合。 相似文献
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Stability of the positively charged manganese centre in GaAs heterostructures examined theoretically by the effective mass approximation calculation near the Γ critical point 下载免费PDF全文
This paper describes an n-i-p-i-n model heterostructure with a manganese (Mn)-doped p-type base region to check the stability of a positively charged manganese AMn+ centre with two holes weakly bound by a negatively charged 3d5(Mn) core of a local spin S=5/2 in the framework of the effective mass approximation near the Γ critical point (k~0). By including the carrier screening effect, the ground state energy and the binding energy of the second hole in the positively charged centre AMn+ are calculated within a hole concentration range from 1 × 1016 cm-3 to 1 × 1017 cm-3, which is achievable by biasing the structure under photo-excitation. For comparison, the ground-state energy of a single hole in the neutral AMn0 centre is calculated in the same concentration range. It turns out that the binding energy of the second hole in the AMn+ centre varies from 9.27 meV to 4.57 meV. We propose that the presence of the AMn+ centre can be examined by measuring the photoluminescence from recombination of electrons in the conduction band with the bound holes in the AMn+ centre since a high frequency dielectric constant of varepsilon ∞ =10.66 can be safely adopted in this case. The novel feature of the ability to tune the impurity level of the AMn+ centre makes it attractive for optically and electrically manipulating local magnetic spins in semiconductors. 相似文献
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