Nonlinear Time-Series Analysis of Photoinduced Fluorescence Oscillation in a Water Dispersion of Colloidal Quantum Dots
Nonlinear Time-Series Analysis of Photoinduced Fluorescence Oscillation in a Water Dispersion of Colloidal Quantum Dots
复制标题
胶体量子点水分散体中光致荧光振荡的非线性时间序列分析
DOI：
10.1021/jp0272973
复制
发表时间：
2003
影响因子：
3.3
通讯作者：
Y. Yamaguchi
中科院分区：
文献类型：
--
作者：
S. Maenosono;Noriko Eiha;Y. Yamaguchi
本文报道了CdSe/ZnS核壳量子点（QDs）在水中分散时所观察到的光诱导荧光振荡。荧光强度在连续激发下以温度敏感的方式自发振荡，并在29 - 30°C出现。实验结果表明，荧光振荡只发生在QD聚集体存在的情况下。用小波分析和30℃时荧光强度数据的非线性时间序列分析来表征振荡。结果表明，荧光振荡受非线性动力学控制，是一类特殊的光致化学振荡。
We report on photoinduced fluorescence oscillation observed in a water dispersion of CdSe/ZnS core/shell quantum dots (QDs). The fluorescence intensity spontaneously oscillates under continuous excitation in a temperature-sensitive manner and emerges at 29−30 °C. The experimental results suggest that the fluorescence oscillation occurs only in the presence of QD aggregates. The oscillation is characterized by wavelet and nonlinear time-series analyses of the fluorescence intensity data at 30 °C. The results reveal self-similarity and nonlinearity, suggesting that the fluorescence oscillation is governed by nonlinear dynamics and is a special class of photoinduced chemical oscillation.