The energy of the system values for the crystal structures of Eu2+ and Yb2+ cations in perovskite.
| Energy of the system (eV) | Energy of the system (eV) | ||
|---|---|---|---|
| CsEuCl3 | –21.04 | CsYbCl3 | –20.57 |
| CsEuBr3 | –19.01 | CsYbBr3 | –16.60 |
| CsEuI3 | –16.69 | CsYbI3 | –16.06 |
| MAEuCl3 | –57.95 | MAYbCl3 | –57.34 |
| MAEuBr3 | –55.95 | MAYbBr3 | –55.31 |
| MAEuI3 | –53.67 | MAYbI3 | –52.97 |
| FAEuCl3 | –63.07 | FAYbCl3 | –62.35 |
| FAEuBr3 | –61.12 | FAYbBr3 | –60.39 |
| FAEuI3 | –58.89 | FAYbI3 | –58.16 |