“…24,000 and 34,500 cm −1 for band (I) and (II), respectively. The origin of the band are the Laporte rule allowed 4f 7 → 4f 6 5d 1 transitions in the Eu(II) ion [6,11,[16][17][18][19]. Moreover, in high energetic region of the spectrum, the Br → Eu charge transfer (CT) transition can be expected.…”