Effects of Eu³⁺Sites on Photoluminescence in Ba₂Ln(BO₃)₂Cl (Ln = Gd, Y) Hosts

Abstract

A series of Eu3+ ions doped Ba2Ln(BO3)2Cl (Ln = Gd, Y) orange-red emitting phosphors were prepared by solid state reaction method. The structure and optical properties were characterized by the X-ray diffraction and photoluminescence spectra. The samples could be excited efficiently by charge transfer band (CTB) centered at 254 nm and n-UV light (350–410 nm) from the 4f6 electron configuration transition. The orange-red emission peaked at 593 nm from the magnetic dipole transition dominates the emission spectra. Crystallographic sites of Eu3+ ions, the structure defect and charge compensation mechanism were discussed. The spectra properties were investigated according to the symmetry of crystallography of Eu3+ ion occupancy. The electric dipole transitions become stronger with the increase of Eu3+ ions concentration, and the optimal compositions of the Ba2Ln(BO3)2Cl:Eu3+ (Ln = Gd, Y) phosphors were also determined.

Photoluminescence properties in novel Ba2Y(BO3)2Cl: Bi3+ blue phosphors with various Bi3+ sites

“…The diffraction peaks of the samples were indexed, as shown in the Fig.1(a). The monoclinic Ba 2 Y(BO 3 ) 2 Cl was main phase [12]. Another impure phase of BaB 2 O 4 was observed, and the diffraction peak of impure phase was represented by the red stars.…”

Design, synthesis and luminescence properties of Ba2YB2O6Cl‐ and Ba2YB2O6F‐based phosphors

“…The intensity of the 5 D 0 -7 F 1 emission is weaker, and other 5 D 0 emissions are almost negligible. However, Eu 3+ shows a dominant 5 D 0 -7 F 1 emission in Ba 2 YB 2 O 6 Cl and Eu 3+ ions are considered to preferentially occupy the Y site (7). This indicates that a non-inversion lattice site is occupied by Eu 3+ ions in Ba 2 YB 2 O 6 F and the lattice site environment of Eu 3+ in the two hosts Ba 2 YB 2 O 6 F and Ba 2 YB 2 O 6 Cl is markedly different.…”

“…For example, Jing et al . reported the photoluminescence properties of Ce 3+ and Eu 3+ in Ba 2 LnB 2 O 6 Cl (Ln = Y, Gd) , and Xia et al . reported the tunable green emission of Eu 2+ in Ba 2 LnB 2 O 6 Cl (Ln = Y, Gd, and Lu) .…”

“…Recently, a family of chloroborates, Ba 2 LnB 2 O 6 Cl (Ln = trivalent rare earth ions), has been investigated because of their advantages of easy synthesis, physical and chemical stability, and tunable composition. The corresponding chloroboratebased phosphors doped with various rare earth ions have been proposed as potential LED phosphors (6)(7)(8)(9)(10)(11)(12) (13). These reports focused on the effect of different Ln on the luminescence properties of the incorporated activators.…”

Novel Broadband Excited and Linear Red‐Emitting Ba2Y(BO3)2Cl:Ce3+, Tb3+, Eu3+ Phosphor: Luminescence and Energy Transfer

“…Furthermore, luminescent properties of Eu 2+ ‐doped Ba 2 Gd(BO 3 ) 2 Cl and Ce 3+ –Tb 3+ ‐codoped Ba 2 Y(BO3) 2 Cl have been also studied. Meanwhile, blue‐emitting Ce 3+ ‐doped, blue‐to‐green emitting Ce 3+ , Tb 3+ codoped, and red‐emitting Eu 3+ ‐doped Ba 2 Ln(BO 3 ) 2 Cl (Ln = Gd, Y) phosphors have been reported by Guo's group. To the best of our knowledge, there is no paper about the luminescent property and ET of Ce 3+ , Tb 3+ , Eu 3+ tri‐doped Ba 2 Y(BO 3 ) 2 Cl.…”