“…These bands result from the charge transfer band, 7 F 0 → 5 H 6 , 7 F 0 → 5 H 3 , 7 F 0 → 5 D 4 , 7 F 0 → 5 G 2 , 7 F 0 → 5 L 6 , 7 F 0 → 5 D 3 , 7 F 0 → 5 D 2 , 7 F 0 → 5 D 1 , and 7 F 1 → 5 D 1 transitions of the Eu 3+ ions. 26 Under 395 nm light irradiation, the emission spectrum displays some distinct transition bands belonging to the 5 D 0 → 7 F J (J=0, 1, 2, 3, 4) transitions of the Eu 3+ ions with centers of 582, 595, 613, 658, and 709 nm. 27 It is important to note that the excitation peak at 395 nm has the maximum absorption and produces the strongest luminescence comparison with the other excitations, as seen in Fig.…”