Using spectra analysis and scanning near-field optical microscopy to study Eu doped polymer fiber

In this article, the normalized excitation spectra corresponding to 616 and 470 nm fluorescence and normalized fluorescence spectrum excited by 335 nm of Eu doped polymer fiber of different concentration are analyzed and compared to indicate the possibility of Eu2+ and Eu3+ ions' coexistence. And the spectra analysis shows fractal clusters' existence in higher concentration. At the same time, the clusters' existence was proved by near-field results of scanning near-field optical microscopy.