外部色噪声对掺铒硅纳米晶亚稳态寿命的增强
Enhancement of the lifetime of metastable states in Er-doped Si nanocrystals by external coloured noise
摘要：
分析了不同噪声强度和相关时间下，在外部色噪声源存在下掺铒硅纳米晶亚稳态能级寿命的变化.激子动力学模拟的一组唯象速率方程，考虑到所有可能的现象，固有的能量状态的Si纳米晶体和Er $^{3+}$离子在硅氧化物的主机材料。通过荧光和能量转移的协同上转换研究了Er原子在第一激发能级$^4$ I $_{13/2}$的初始布居数的衰减，研究了Er原子的电子退激发.我们的结果表明，在较宽的噪声强度和关联时间范围内，$^4$ I $_{13/2}$能级的退激过程被减慢.此外，一个非单调的行为的寿命与波动的幅度被发现，其特征在于由一个最大的变化值的噪声相关时间可比的去激时间。本文还讨论了色噪声对$^4$ I $_{13/2}$能级激活的能量转移上转换效率的间接影响。
英文摘要：
The changes in the lifetime of a metastable energy level in Er-doped Si nanocrystals in the presence of an external source of colored noise are analyzed for different values of noise intensity and correlation time. Exciton dynamics is simulated by a set of phenomenological rate equations which take into account all the possible phenomena inherent to the energy states of Si nanocrystals and Er$^{3+}$ ions in the host material of Si oxide. The electronic deexcitation is studied by examining the decay of the initial population of the Er atoms in the first excitation level $^4$I$_{13/2}$ through the fluorescence and the cooperative upconversion by energy transfer. Our results show that the deexcitation process of the level $^4$I$_{13/2}$ is slowed down within wide ranges of noise intensity and correlation time. Moreover, a nonmonotonic behavior of the lifetime with the amplitude of the fluctuations is found, characterized by a maximum variation for values of the noise correlation time comparable to the deexcitation time. The indirect influence of the colored noise on the efficiency of the energy transfer upconversion activated from the level $^4$I$_{13/2}$ is also discussed.
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