title: Photoluminescence properties of aeschynite-type LaNbTiO6:RE3+ (RE = Tb, Dy, Ho) down-converting phosphors.
abstract: In this study, a series of LaNbTiO6:RE(3+) (RE = Tb, Dy, Ho) down-converting phosphors were synthesized using a modified sol-gel combustion method, and their photoluminescence (PL) properties were investigated as a function of activator concentration and annealing temperature. The resultant particles were characterized using X-ray diffraction, transmission electron microscopy, scanning electron microscopy, UV/Vis diffuse reflectance spectroscopy and PL spectra. The highly crystalline LaNbTiO6:RE(3+) (RE = Tb, Dy, Ho) phosphors with an average size of 200-300 nm obtained at 1100°C have an orthorhombic aeschynite-type structure and exhibit the highest luminescent intensity in our study range. The emission spectra of LaNbTiO6:RE(3+) (RE = Tb, Dy, Ho) phosphors under excitations at UV/blue sources are mainly composed of characteristic peaks arising from the f-f transitions of RE(3+), including 489 nm ((5) D4 → (7) F6) and 545 nm ((5) D4 → (7) F5) for Tb(3+), 476 and 482 nm ((4) F9/2 → (6) H15/2) and 571 nm ((4) F9/2 → (6) H13/2) for Dy(3+), and 545 nm ((5) F4 + (5) S2 → (5) I8) for Ho(3+), respectively. The luminescent mechanisms were further investigated. It can be expected that these phosphors are of intense interest and potential importance for many optical applications.
authors.affiliation: School of Material Science and Engineering, University of Jinan, 250022, Jinan, People's Republic of China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Ma
authors.forename: Mengkai
authors.initials: M
authors.lastname: Lu
authors.forename: Ping
authors.initials: P
authors.lastname: Yang
authors.forename: Aiyu
authors.initials: A
authors.lastname: Zhang
authors.forename: Yongqiang
authors.initials: Y
authors.lastname: Cao
mesh_terms: D004419:Dysprosium / Q000737:chemistry*; D049449:Luminescence; D049408:Luminescent Agents / Q000737:chemistry*; D008163:Luminescent Measurements; D010316:Particle Size; D014961:X-Ray Diffraction
chemical_list: D049408:Luminescent Agents; D004419:Dysprosium
keywords: LaNbTiO6; aeschynite-type; luminescence; phosphor