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制备了一种较高浓度掺杂的CdSe/ZnS量子点掺杂光纤。测量了不同掺杂浓度和不同光纤长度下的量子点光纤光致荧光光谱,得到了荧光峰值增益最大时的量子点掺杂浓度和光纤长度。与低浓度掺杂光纤相比,较高掺杂浓度光纤中的荧光峰值光强明显提高。荧光峰值光强随光纤长度的变化在短距离内(L<1cm)急剧上升,之后缓慢均匀下降。波长473nm激励光强随光纤长度的变化呈指数形式衰减,消光系数为0.26～1.02cm-1。在给定激励光强和激励波长的条件下,光纤中可达到最大荧光辐射的量子点总数为一恒量。光纤中的荧光峰值波长存在红移,红移大小约8～15nm,红移量与掺杂浓度以及光纤长度有关。这些实验结果可为今后量子点光纤放大器的研制提供参考。
A higher concentration doped CdSe / ZnS quantum dot doped fiber was prepared. The photoluminescence spectra of QDs at different doping concentrations and fiber lengths were measured, and the quantum dot doping concentration and fiber length at the maximum fluorescence peak gain were obtained. Compared with the low concentration doped fiber, the fluorescent intensity of the higher doping concentration fiber obviously increases. Fluorescence peak intensity with the fiber length changes in a short distance (L <1cm) increased sharply, then slowly and evenly decreased. The wavelength of 473nm excitation light exponentially decayed with the change of fiber length, the extinction coefficient was 0.26 ~ 1.02cm-1. Given the excitation intensity and the excitation wavelength, the total number of quantum dots in the fiber that achieves maximum fluorescence emission is a constant. Fluorescent peak wavelength in the fiber redshift, the redshift size of about 8 ~ 15nm, the amount of redshift and the doping concentration and the length of the fiber. These experimental results can provide reference for the future development of quantum dot optical fiber amplifier.