Synthesis and optical properties of copper-doped ZnSe quantum dots
Synthesis and optical properties of copper-doped ZnSe quantum dots
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DOI：
10.1088/0031-8949/90/1/015803
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发表时间：
2014
期刊：
影响因子：
2.9
通讯作者：
C. Rajesh;Chinmay Phadnis;K. Sonawane;S. Mahamuni
中科院分区：
文献类型：
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作者：
C. Rajesh;Chinmay Phadnis;K. Sonawane;S. Mahamuni
报道了一种新的制备掺铜锌硒量子点的方法。只需增加量子点的尺寸，就可以将发射特性从蓝色区域调整到绿色区域。与未掺杂的锌硒量子点相比，铜：锌硒量子点的光吸收发生了红移。量子点尺寸的增加可以用反应运动学的变化来解释。PL测量既显示了带边，也显示了与铜有关的发射。电子波函数的离域导致与铜有关的发射随着尺寸的变化而移动。在铜发射时记录的PL激发谱显示了ZnSe能级以及350-370 nm之间的特征。这一特征与铜离子的激发能级有关。绘制了电子能级随尺寸和铜掺入情况的变化图。
This paper reports a new method to synthesize Cu-doped ZnSe quantum dots (QDs). Emission properties are tuned from the blue to the green region simply by increasing the size of the QDs. A red shift in optical absorption of Cu:ZnSe QDs compared with undoped ZnSe QDs is observed. The increase in size of QDs is explained by a change in reaction kinematics. PL measurements revealed both a band edge as well as a copper-related emission. Delocalization of electronic wave functions leads to a shift in the copper-related emission with in size. PL excitation spectra recorded at Cu emission shows ZnSe energy levels along with a feature between 350–370 nm. This feature is assigned to excited energy levels of Cu ions. Variation in electron energy levels as a function of size and on Cu incorporation is mapped.