tm 4d

The schematic structure of pristine and Sb 3+ /Tm 3+ co-doped Cs 2 NaYCl 6 SCs (space group: Fm-3 m) was shown in Fig. 4d ai apk 1 a The [YCl 6] 3-and [NaCl 6] 5-octahedrons are placed alternately in the rock-salt face-centered cubic structure, the doped Sb 3+ and Tm 3+ ions replaced the lattice of Y 3+ ions to form the [YCl 6] 3-and [YCl 6] 3-octahedral due to the similar ionic radius and same valence