Singlet oxygen generation by nanoporous silicon: photoluminescence dynamics in magnetic field.
Singlet oxygen generation by nanoporous silicon: photoluminescence dynamics in magnetic field.
复制标题
纳米多孔硅产生单线态氧：磁场中的光致发光动力学。
DOI：
10.1088/1361-6528/ab4442
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发表时间：
2020
期刊：
影响因子：
3.5
通讯作者：
Aliev GN
中科院分区：
文献类型：
--
作者：
Aliev GN
通过磁光实验研究了多孔硅（PSi）中单线态氧的生成。在 1.4-2.5 eV 的光谱范围和 0-6 特斯拉的磁场中，在不同水平的氧浓度和激发泵功率下，监测了由交换相互作用介导的能量转移 (ET) 过程引起的光致发光 (PL) 猝灭。当施加磁场时，PL 恢复，并且对于低于 2 特斯拉的磁场和高浓度氧气，观察到不寻常的附加泵浦功率依赖性 PL 猝灭。开发了一个速率方程模型，描述在低温磁场下吸附氧的 PSi 产生 PL 的行为。该模型已扩展到涵盖作为纳米颗粒尺寸函数的 ET 过程。
Singlet oxygen generation in porous silicon (PSi) was investigated by a magneto-optical experiment. Photoluminescence (PL) quenching due to an energy transfer (ET) process mediated by an exchange interaction was monitored in the spectral range 1.4–2.5 eV and in a magnetic field of 0–6 Tesla at different levels of oxygen concentration and excitation pump power. When a magnetic field was applied, both PL recovery and, for magnetic fields below 2 Tesla and high concentrations of oxygen, an unusual additional pump power dependent quenching of the PL was observed. A rate equation model describing the behavior of PL from PSi with oxygen adsorbed at cryogenic temperatures in magnetic field was developed. The model has been expanded to cover the ET process as a function of the nanoparticle size.