Photoluminescence and time-resolved luminescence spectroscopy of novel NaBa4(BO3)3:Tb3+ phosphor

Luminescence properties of novel yellowish-green-emitting phosphor KBaBP2O8:Tb3+

“…The measured decay constant of the 5 D 4 ! 7 F 5 transition is found to be close to those published elsewhere such as Ca 3 La 3 (BO 3 ) 5 :Tb 3þ (2 ms) [5], NaCaPO 4 :Tb 3þ (2.69 ms) [7], NaBa 4 (BO 3 ) 3 :Tb 3þ (1.9 ms) [25], Ca 4 GdO(BO 3 ) 3 :Tb 3þ (2.02 ms) [26], K 3 Gd(PO 4 ) 2 :Tb 3þ (2.8 ms) [27]. Generally, phosphors doped with Tb 3þ activator have a decay time of the order of a millisecond induced by a forbidden transition of Tb 3þ according to a spin-selection rule.…”

Enhanced Green Emission of Eu2+ by Energy Transfer from the 5D3 Level of Tb3+ in NaCaPO4

“…(iii) The excitation spectrum above 300 nm is composed of the 4f−4f transitions of Tb 3+ ion. 29,30 Curve c is the emission spectrum under 229 nm excitation in which two strong emission peaks at 545 and 490 nm are due to the 5 D 4 → 7 F 5 and 5 D 4 → 7 F 6 transitions of Tb 3+ ion, respectively. 31 We also find that the blue emission spectrum from the 5 D 3 manifold of Tb 3+ ions overlaps with the excitation spectrum of Eu 2+ .…”

“…(ii) The excitation bands in 174–300 nm range are made of the 4f–5d transitions of Tb 3+ ion [the band which was magnified 50 times corresponds to the spin-forbidden 4f 8 → 4f 7 5d 1 ( 7 F 6 → 9 D) transition of Tb 3+ ], the lowest spin-allowed f → d transition of Tb 3+ observed at ∼229 nm is in good agreement with above estimation. (iii) The excitation spectrum above 300 nm is composed of the 4f–4f transitions of Tb 3+ ion. , Curve c is the emission spectrum under 229 nm excitation in which two strong emission peaks at 545 and 490 nm are due to the 5 D 4 → 7 F 5 and 5 D 4 → 7 F 6 transitions of Tb 3+ ion, respectively…”

Luminescence properties and crystallographic sites for Eu3+ ions in fluorthalenite Y3Si3O10F

“…There have been extensive studies on in oxide-based phosphors such as phosphates [1][2][3], borates [4][5][6], and silicates [7][8][9][10] doped with rare earth ions. In particular, the silicate-based phosphors have recently attracted much attention because of its excellent thermal and chemical stability, lower cost, and high luminescent efficiency.…”