Carrier recombination process and magneto-photoluminescence in Zn1−xCoxO layers
Carrier recombination process and magneto-photoluminescence in Zn1−xCoxO layers
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DOI：
10.1063/1.3455854
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发表时间：
2010-07
影响因子：
3.2
通讯作者：
Zhiyan Xiao;H. Matsui;K. Katayama;K. Miyajima;T. Itoh;H. Tabata
中科院分区：
文献类型：
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作者：
Zhiyan Xiao;H. Matsui;K. Katayama;K. Miyajima;T. Itoh;H. Tabata
当基质中存在孤立的Co离子(x不超过0.008)时，可以得到高质量的−_xCo_xO薄膜。本文主要研究了−_xCo_xO(x=0.0015)层中激子和钴相关发射的光致发光特性，主要研究了零磁场和高达7T磁场下激子态到钴中心的能量传递过程。研究发现，随着激子发射的抑制，−_xCo_xO(x=0.0015)层中3d内发射的Co发射显著增强，表明Co中心存在有效的能量转移。吸收光谱和磁致发光光谱的指认表明，向Co中心的能量转移不是来自激子态，而是来自带间激发后Co中心形成的电荷转移(CT)态。最后，我们认为，−_xCo_xO(x=0.0015)层的能量传递过程主要与杂质俄歇复合作用有关。
High-quality Zn1−xCoxO layers were obtained with isolated Co ions in the host (x no more than 0.008). The photoluminescence properties of excitonic and Co-related emissions in the Zn1−xCoxO (x=0.0015) layer were mainly investigated in both zero and up to 7 T magnetic fields in order to clear the energy transfer process from excitonic states to Co centers. It was found that Co emissions originated from 3d intraemissions in the Zn1−xCoxO (x=0.0015) layer were remarkably enhanced with the suppression of excitonic emissions, indicating the presence of efficient energy transfer to the Co centers. Assignment of absorption and magnetoluminescence spectra revealed that the energy transfer to the Co centers was not derived from the excitonic states but from charge transfer (CT) states formed on the Co centers after a band-to-band excitation. Finally, we consider that the primary role for the energy transfer process of Zn1−xCoxO (x=0.0015) layer is related to the phenomenon of impurity Auger recombination acting as...