Figure 7
TI effect mechanisms for (a) CaYSi 4 N 7 :Eu, (b) SrYSi 4 N 7 :Eu, and (c) BaYSi 4 N 7 :Eu. TIP and CFS represent the TI process and crystal field splitting, respectively. VB and CB represent the valence and conduction bands of hosts, respectively.