掺铒硅发光的晶场分裂

测量了掺铒硅的高分辨光致发光光谱，得到9条铒发光分裂谱线.利用群对称理论指出9条谱线来自Er³⁺中⁴I_13/2到⁴I_15/2光跃迁在T_d晶场下的分裂.Er³⁺的第一激发态⁴I_13/2最低能量的两个Stark能级为Γ₈，Γ₆(能量递增)，它们到基态⁴关键词：

CRYSTAL-FIELD SPLITTING OF Er3+ IN SILICON

Rare earth element of erbium implanted into silicon was studied by photoluminescence,and nine spectral lines were observed.The analysis of the symmetry of crystal field shows that the nine spectral lines come from the crystal-field splitting of the transition ⁴I_13/2→⁴I_15/2.We concludethat the symmetry of the two low-energy excited (initial) state levels,in order of increasing energy,are Γ₈ and Γ₆, from which to the splitting state levels of ⁴I_15/2 nine radiative transitions are allowed.Oxygen codopants can increase greatly the PL intensity of Er³⁺, but the spectral features are similar,indicating oxygen codopants can enhance the intensity of T_d crystal field rather than change the T_d symmetry of the crystal field on the Er³⁺ sites.