在二能级系统近似下,对CuInS2/ZnS量子点光纤的发光性质进行理论计算,得到在不同量子点荧光寿命、斯托克斯频移和吸收-发射截面时,量子点发光沿光纤的传输情况。结果表明,当3个参数一定时,量子点光纤的发光强度随着光纤长度的增加而增加,但最后都趋于饱和或有所下降。当光纤长度一定时,荧光寿命、斯托克斯频移和吸收-发射截面每变化原来数值的1倍,光纤发光的相对强度分别改变7.1,10.52和2.8,因此斯托克斯频移对光纤发光强度的影响最大,其次为荧光寿命,影响最小的是吸收-发射截面。但是对光谱峰值位置影响最大的是吸收-发射截面,在 80 cm光纤中,截面每增加1倍,光谱红移5.36 nm。理论计算的发光强度随光纤长度的变化趋势符合文献中的实验数据。本文为量子点光纤中掺杂材料的选择提供了一种实用的方法。

The emission properties of CuInS2/ZnS quantum dot optical fibers(QD-OFs) were theoretically calculated under the two-level system approximation, and the transmission of QD emission along the optical fiber was obtained under different QD fluorescence lifetime, Stokes shift and absorption-emission cross section(AECS). The results showed that when the three parameters were fixed, the emission intensity of QD-OFs increased with the increasing fiber length, but all of them eventually tended to saturation or decreased. When the fiber length was fixed, the relative intensity of the fiber emission was changed by 7.1, 10.52 and 2.8 for each change of the fluorescence lifetime, Stokes shift and AECS by 1 time. Therefore, Stokes shift had the greatest influence on the OF emission intensity, followed by the fluorescence lifetime, and the least influence was the AECS. However, the AECS had the greatest influence on the spectral peak position. In the 80 cm OF, the spectral redshift was 5.36 nm when the AECS increased by 1 time. The variation trend of emission intensity with fiber length calculated by theory accorded with the experimental data in the literature. This paper provides a practical method for the selection of doped materials in QD-OFs.