摘要
在有效质量近似条件下,利用变分法计算了量子点高度对GaN/AlGaN量子点光学性质的影响。研究了激子结合能、量子点发光波长、电子-空穴复合率随量子点高度的变化关系。数据结果表明量子点高度对激子结合能、量子点发光波长、电子-空穴复合率有着重要的影响,激子效应将使量子点发光波长红移。
Based on the framework of effective-mass approximation and variational approach,the optical properties of cubic GaN/Al0.15Ga0.85N quantum dots were investigated theoretically.Considering the three-dimensional confinement of electron and hole,the exciton binding energy,the emission wavelength and the oscillator strength were calculated as function of the dot height L.The results indicate that the dot height L has a significant influence on the exciton binding energy,the emission wavelength and the electron-hole recombination.Furthermore,exciton effect will make the emission wavelength increase.
出处
《新乡学院学报》
2011年第1期25-27,共3页
Journal of Xinxiang University
基金
河南省教育厅自然科学研究基金(2009B140006)
关键词
闪锌矿量子点
发光波长
电子-空穴复合率
激子结合能
激子效应
cubic quantum dot
emission wavelength
electron-hole recombination
the exciton binding energy
exciton effect
