CdSe/ZnS量子点光纤光致荧光光谱的红移

Red Shift of Photoluminescence Spectrum of CdSe/ZnS-Quantum-Dot Doped Fiber

制备了一种CdSe/ZnS量子点掺杂光纤,测量了不同掺杂浓度和光纤长度下的量子点光致荧光光谱,得到了荧光峰值波长的红移随量子点光纤掺杂浓度和光纤长度的变化。观测对比了4种不同纤芯本底材料(UV胶、甲苯、正己烷和正癸烷)随光纤长度增加的红移,发现在不同的本底材料中,红移随光纤长度的增加的速率不同。在不同本底材料和不同的掺杂浓度下,最大红移均趋向于20nm的同一饱和值,该饱和值取决于量子点第一吸收峰的半峰全宽。

CdSe/ZnS-quantum-dot doped fibers （QDF） are prepared. By measuring the photoluminescence （PL） spectra of the QDFs with various doping concentrations and fiber lengths, the red shift of the PL peak wavelength of the QDFs is observed, which is dependent on the doping concentration and the fiber length. The red shift as a function of fiber length in four fiber-core materials （toluene, ultraviolet curable adhesive, hexane and decane） is determined. Although the increase/decrease rate of the red shift depends on the core material and the doping concentration, the maximum red shift even approaches to an identical saturation value （20 nm）, which is correlated with the full-width at half-maximum（FWHM） of the first absorption peak of the QD.