Uniform and well-dispersed LaBO₃hierarchical architectures: synthesis, formation, and luminescence properties

Circularly Polarized Luminescence from Inorganic Materials: Encapsulating Guest Lanthanide Oxides in Chiral Silica Hosts

“…For the excitation spectra (solid line in Figure a, monitored using an emission wavelength of 545 nm), a strong peak around 227 nm (4 f–5 d transition of Tb 3+ ) was observed. On the emission spectra (solid line in Figure b, excited at 220 nm), the characteristic emission peaks of Tb 3+ appeared at 489, 545, 588, and 618 nm, attributed to the transitions of 5 D 4 → 7 F 6 , 5 D 4 → 7 F 5 , 5 D 4 → 7 F 4 , and 5 D 4 → 7 F 3 , respectively . The luminescent intensity at 545 nm is so strong that the powders exhibited green luminescence under UV irradiation.…”

Controlled synthesis of different multilayer architectures of GdBO3:Eu3+ phosphors and shape-dependent luminescence properties

“…characteristic vibration modes of B 3 O 9 9− groups in the vateritetype orthoborates [26][27][28]32]. But the presence of triangular BO 3 3− groups in the calcite-type and aragonite-type orthoborates is characterized by strong absorption band at 1290 cm −1 [29,30]. Two strong peaks at around 844 and 904 cm −1 are ascribed to ring stretching vibration modes, whereas the peak at around 1100 cm −1 is ascribed to a terminal B-O stretching vibration mode.…”

A General Approach to Spindle-Assembled Lanthanide Borate Nanocrystals and Their Photoluminescence upon Eu3+/Tb3+ Doping

“…In the Eu 3+ -doped samples, it is known that 5 D 0 → 7 F 1 belongs to a magnetic dipole transition while 5 D 0 → 7 F 2 and 5 D 0 → 7 F 2 originate from electric dipole transitions. 23 The intensity of an electric dipole transition depends strongly on the site symmetry of a crystal, while that of a magnetic dipole transition is not affected by it. On the basis of the Judd−Ofelt theory, electric dipole transitions will be dominant if the Eu 3+ ions occupy the sites without inversion symmetry.…”

“…Furthermore, little attention has been paid to the synthesis of LnBO 3 nanocrystals with large Ln 3+ ions (e.g., La 3+ , Pr 3+ , and Nd 3+ ) that generally possess an orthorhombic or a monoclinic phase instead of a hexagonal one, while it is known that luminescence of a Eu 3+ ion is much more sensitive to the crystalline phase of a crystal. 22,23 In this work, we present a hydrothermal approach to synthesizing various lanthanide (La−Tb) borate nanocrystals that are self-assembled into a three-dimensional architecture. These assemblies exhibit a spindle-like appearance, and each of them consists of many tiny lanthanide borate nanocrystals.…”