Al3+ -doping-induced enhancement of Tb3Ga5O12:Eu3+ orange light-emitting phosphor photoluminescence for white light-emitting diodes

The composition engineering of red‐emitting Eu3+‐doped Ca10.5(PO4)7‐type solid solution phosphors and application in LED

“…When Eu 3+ possesses a strong symmetry crystal field with an inversion center, orange light emission caused by the 5 D 0 -7 F 1 magnetic dipole transition will occur, such as Tb 3 Ga 5 O 12 :Eu 3+ , Gd 2 Sn 2 O 7 :Eu 3+ , etc. 15,16 If Eu 3+ occupies a noninversion symmetry center, red light from 5 D 0 -7 F 2 electric dipole transition is dominated, such as BaGd 2 Si 3 O 10 :RE 2+/3+ (RE = Eu or Ce), NaBaBi 2 (PO 4 ) 3 :Eu 3+ , etc. [17][18][19] Therefore, it is worthy of studying to improve the luminescence intensity and purity of Eu 3+ -doped phosphors through regulating the chemical environment around Eu 3+ ions in a specific crystal structure.…”

“…Owing to the transition state of 5 D 0 ‐ 7 F J (J = 1‐4), Eu 3+ ion is considered to be one of the most common red/orange emission centers, which are sensitive to their nearby surroundings. When Eu 3+ possesses a strong symmetry crystal field with an inversion center, orange light emission caused by the 5 D 0 ‐ 7 F 1 magnetic dipole transition will occur, such as Tb 3 Ga 5 O 12 :Eu 3+ , Gd 2 Sn 2 O 7 :Eu 3+ , etc 15,16 . If Eu 3+ occupies a noninversion symmetry center, red light from 5 D 0 ‐ 7 F 2 electric dipole transition is dominated, such as BaGd 2 Si 3 O 10 :RE 2+/3+ (RE = Eu or Ce), NaBaBi 2 (PO 4 ) 3 :Eu 3+ , etc 17‐19 .…”