Temperature dependence of photoluminescence spectra of nondoped and electron-doped SrTiO3: crossover from auger recombination to single-carrier trapping.
Temperature dependence of photoluminescence spectra of nondoped and electron-doped SrTiO3: crossover from auger recombination to single-carrier trapping.
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DOI：
10.1103/physrevlett.102.247401
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发表时间：
2009-06
影响因子：
8.6
通讯作者：
Y. Yamada;H. Yasuda;T. Tayagaki;Y. Kanemitsu
中科院分区：
文献类型：
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作者：
Y. Yamada;H. Yasuda;T. Tayagaki;Y. Kanemitsu
报道了SrTiO（3）晶体在低温下的反常光致发光（PL）行为。在未掺杂和电子掺杂的SrTiO（3）样品中，PL谱和动力学在150 K以下都出现突变。我们澄清了未掺杂和电子掺杂SrTiO（3）中的PL动力学可以用相同的简单模型很好地描述，包括单载流子捕获，辐射双分子复合和非辐射俄歇复合。PL动力学的不寻常的温度依赖性是由从高温下的俄歇复合到低温下的单载流子捕获的交叉引起的。我们讨论了温度相关的PL动力学结合SrTiO（3）在低温下的高载流子迁移率。
We report unusual photoluminescence (PL) behaviors in highly photoexcited SrTiO(3) crystals at low temperatures. The PL spectrum and dynamics show abrupt changes below 150 K in both nondoped and electron-doped SrTiO(3) samples. We clarified that the PL dynamics in both nondoped and electron-doped SrTiO(3) is well described by the same simple model involving single-carrier trapping, radiative bimolecular recombination, and nonradiative Auger recombination. The unusual temperature dependence of PL dynamics is caused by the crossover from Auger recombination at high temperatures to single-carrier trapping at low temperatures. We discuss the temperature-dependent PL dynamics in conjunction with the high carrier mobility of SrTiO(3) at low temperatures.