Optical properties of core/shell spherical quantum dots**Project supported by the Natural Science Foundation of Inner Mongolia Autonomous Region, China (Grant Nos. 2019MS01006 and 2020MS01008), the Science Project of the Higher Education of Inner Mongolia Autonomous Region, China (Grant No. NJZY19047), the Doctoral Starting-up Foundation of Inner Mongolia Agricultural University, China (Grant No. BJ2013B-2), and the Grassland Talent Project, China.

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In this study, the effects of quantum dot size on the binding energy, radiative lifetime, and optical absorption coefficient of exciton state in both GaN/AlxGa1−xN core/shell and AlxGa1−xN/GaN inverted core/shell quantum dot structures are studied. For the GaN/AlxGa1−xN core/shell structure, the variation trend of binding energy is the same as that of radiation lifetime, both of which increase first and then decrease with the increase of core size. For AlxGa1−xN/GaN inverted core/shell structure, the binding energy decreases first and then increases with core size increasing, and the trends of radiation lifetime varying with core size under different shell sizes are different. For both structures, when the photon energy is approximately equal to the binding energy, the peak value of the absorption coefficient appears, and there will be different peak shifts under different conditions.