Time-resolved spectroscopy of the visible emission band in strontium titanate.
Time-resolved spectroscopy of the visible emission band in strontium titanate.
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DOI：
10.1103/physrevb.33.8649
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发表时间：
1986-06
期刊：
影响因子：
--
通讯作者：
Leonelli;Brebner
中科院分区：
文献类型：
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作者：
Leonelli;Brebner
研究了SrTiO_（3）$在1.6 ~ 3.2eV范围内的发光光谱随激发后时间的变化。可以观察到最大强度在2.44 eV处的宽发射带。这个带的形状，包括一些精细结构，可以复制的Huang-Rhys模型的激发晶格相互作用。导出了振子能量为88 meV，黄-里斯因子为6.结果表明，这些值是一致的激子自陷所需的。的发光强度已遵循的时间在100 ns和10 ms之间。衰减曲线表明，涉及两个重组过程。我们将第一个与自陷激子相互作用的声学声子和第二个与本地化的电子和空穴的自陷激子的延迟形成。的发射似乎是淬火的非辐射复合通道，其激活能为0.07 eV。
The luminescence spectrum of ${\mathrm{SrTiO}}_{3}$ from 1.6 to 3.2 eV has been studied as a function of time elapsed after excitation. A broad emission band with maximum intensity at 2.44 eV can be observed. The shape of this band, including some fine structure, can be reproduced by the Huang-Rhys model for excitation-lattice interaction. A vibron energy \ensuremath{\Elzxh}\ensuremath{\Omega}=88 meV and a Huang-Rhys factor ${S}_{0}$\ensuremath{\simeq}6 are deduced. It is shown that those values are consistent with what is required for exciton self-trapping. The luminescence intensity has been followed for times between 100 ns and 10 ms. The decay curves indicate that two recombination processes are involved. We associate the first one with self-trapped excitons interacting with acoustic phonons and the second with the retarded formation of self-trapped excitons from localized electrons and holes. The emission appears to be quenched by a nonradiative recombination channel whose activation energy is 0.07 eV.