【摘要】 MgAl2S4,CaAl2S4,Co2+:MgAl2S4和Co2+:CaAl2S4晶体是典型的三重复合半导体材料,由化学输运反应的方法可以成功制备而得出,具有宽的能隙结构,因而在光电方面有着非常重要的应用而备受广泛的关注.采用Sugano-Tanabe强场近似理论,引入平均共价因子N,利用经典晶场能量矩阵公式,在D2d对称模型下计算出的结果较好符合了实验事实,从而纠正了S.K.Oh等人对Co2+:CaAl2S4吸收光谱的不合理解释.更多还原

【Abstract】 MgAl2S4, CaAl2S4, Co2+: MgAl2S4 and Co2+: CaAl2S4 single crystals, belonging to typical ternary compound semiconductor material, and grown by means of chemical transport reaction, are wide-band gap materials, and expected to be promising materials with potential applications in optoelectronic devices. By applying Sugano-Tanabe strong field scheme, introducing average covalent factor N, and using the energy matrix formula of classic crystal field, the d-d transition of Co2+: CaAl2S4 in symmetry of D2d is calculated. The theoretical results are in good agreement with the experiments, thus correcting the unreasonable explanation made by S. K. Oh of the aborption spectra of the Co2+: CaAl2S4 single crystal.更多还原