Photoluminescence properties of dysprosium doped novel apatite-type Ba2Y3(SiO4)3F white-emitting phosphor

Luminescence Behavior of the Ba2HfF8:Dy3+/Sm3+ Nanophosphor for White Light-Emitting Applications

“…After excitation at the 349 nm wavelength, the Dy 3+ ions relax nonradiatively through multiphoton relaxation (MPR) to the lower 4 F 9/2 level. As presented in Figure a, the emission from the 4 F 9/2 to 6 H 15/2 and 6 H 13/2 transition levels, blue emission at 480 nm and yellow emission at 572 nm, can be observed, respectively. , The peak at 480 nm corresponds to a magnetic dipole (MD) and is usually not sensitive to the local site symmetry; however, the 572 nm peak is a hypersensitive electric dipole (ED) transition (Δ L = Δ J = 2) and is extensively affected by the environment of the Dy 3+ ion. , In general, the MD transition is significant when f ions are situated at a site coinciding with a center of symmetry, and the ED transition is significant when f ions are at a site that lacks an inversion symmetry. , The emission ratio of the blue band and the yellow band of Dy 3+ could be used as a probe to detect the local site symmetry of the activator ions. The fact that the 480 nm peak (MD) and the 572 nm peak (ED) are equal in emission strength indicates that Dy 3+ ions are lying at two nonequivalent sites in the BHF lattice.…”

“…27,28 The peak at 480 nm corresponds to a magnetic dipole (MD) and is usually not sensitive to the local site symmetry; however, the 572 nm peak is a hypersensitive electric dipole (ED) transition (ΔL = ΔJ = 2) and is extensively affected by the environment of the Dy 3+ ion. 16,29 In general, the MD transition is significant when f ions are situated at a site coinciding with a center of symmetry, and the ED transition is significant when f ions are at a site that lacks an inversion symmetry. 30,31 The emission ratio of the blue band and the yellow band of Dy 3+ could be used as a probe to detect the local site symmetry of the activator ions.…”

“…It can present two characteristic emission bands in the luminescence spectrum, 4 F 9/2 → 6 H 15/2 at 480 nm (blue) and 4 F 9/2 → 6 H 13/2 at 572 nm (yellow) . Many Dy 3+ -doped phosphors such as LiLuF 4 :Dy 3+ , Gd 2 O 3 :Dy 3+ , Dy 3+ -doped oxyfluorosilicate glass, and Ba 2 Y 3 (SiO 4 ) 3 F:Dy 3+ reported white emission of Dy 3+ . On the other hand, Sm 3+ is also a promising activator for orange-red emission for applications in lasing, remote sensing, and telecommunication .…”

Synthesis and photoluminescence properties of Ba2Y3(SiO4)3F:Tm3+ blue-emitting fluorosilicate phosphors

“…The surface morphology was studied via a JEOL JSM-6490 emission scanning electron microscopy (SEM). The photoluminescence spectra of all the samples were characterized by F4600 spectrometer (Hitachi) Obviously, with the increase of Tm 3+ dopant concentration, all the diffraction peaks were in accordance with the simulated patterns generated by the structural parameters of Ba2Y3(SiO4)3F [17,18]. It indicated the small amount of Tm 3+ ions does not evidently influence the crystal structure of Ba2Y3(SiO4)3F.…”

Structure and luminescence properties of a novel broadband green-emitting oxyapatite-type phosphor

“…[20][21][22][23] The apatite-type structured compounds have two nonequivalent cationic sites for the Eu 2+ occupation, which enables them to be one of the most potential phosphor host materials. 24,25 In general, compounds with the apatite structure are characterized by a general chemical formula of M 10 [XO 4 ] 6 Y 2 , where M is dened as a divalent cation (Mg 2+ , Ca 2+ , Ba 2+ , etc. ), whereas rare-earth ions (Y 3+ , La 3+ , Eu 2+ etc.…”