Vibrational and spectroscopic analysis of white light emitting Bi2SiO5 nanophosphor

Construction of amorphous SiO2 modified β-Bi2O3 porous hierarchical microspheres for photocatalytic antibiotics degradation

This work describes the synthesis of porous hierarchical microspheres composed of amorphous SiO₂ and crystalline β-Bi₂O₃ (BSO) via a simple solvothermal process and subsequent calcination. Complementary physicochemical methods were applied to study the function of amorphous SiO₂, as well as the phase composition and morphology evolution of as-synthesized samples as a function of calcination temperature. The presence of amorphous SiO₂ contributed to form hierarchically structured β-Bi₂O₃ with enhanced thermostability. Moreover, the degradation of tetracycline hydrochloride (TC) under visible light irradiation was employed as a model reaction to evaluate the photocatalytic activity of as prepared materials. In consequence, both phase composition and morphology were found to be significant parameters for adjusting the photocatalytic performance of the synthesized samples. The fastest TC degradation at a low dosage of catalyst (0.2 g L^-1) was observed for the sample annealed at 400℃ which contains a highly crystalline β-Bi₂O₃ phase. The synergistic effect of the porous structure, excellent light absorption, and higher charge carrier separation and transfer efficiency is believed to be the reason for the optimal photocatalytic activity. This study offers a new method toward the fabrication of hierarchical porous structured β-Bi₂O₃ with enhanced thermostability for various applications.

Yolk–shell structured Bi2SiO5:Yb3+,Ln3+ (Ln = Er, Ho, Tm) upconversion nanophosphors for optical thermometry and solid-state lighting

Bi₂SiO₅:Yb³⁺,Er³⁺ yolk–shell nanophosphors have been successfully synthesized, which are expected to find important applications in optical thermometry and solid-state lighting.

Facile synthesis, structure, and tunable luminescence properties of novel one-dimensional Bi4Si3O12 fibers

A series of novel one-dimensional Bi₄Si₃O₁₂ fibers with tunable luminescence have been synthesized via the electrospinning method for the first time.

Color tunable emission and energy transfer of Ce3+/Dy3+ codoped Ba3La2(BO3)4 phosphor for UV white LEDs

Polycrystalline Ba₃La₂(BO₃)₄:Ce³⁺,Dy³⁺ sub-micrometer-sized phosphors were synthesized by solid-state reaction under a weak reductive atmosphere. The structure, static and time-resolved photoluminescence are investigated. Under the near-ultraviolet excitation, the Ba₃La₂(BO₃)₄:Dy³⁺ phosphors emit white light with three intense emission bands centered at 483, 575, and 665 nm. The efficient energy transfer from Ce³⁺ to Dy³⁺ in Ba₃La₂(BO₃)₄ phosphor was found by excitation/emission spectra and decay time measurements, and the resonant type was demonstrated by a dipole-dipole mechanism. A tunable emission hue from blue (0.18, 0.20) to blue-white (0.26, 0.29) and eventually to white (0.32, 0.33) was obtained in Ba₃La₂(BO₃)₄:Ce³⁺,Dy³⁺ phosphors. Owing to the broad UV excitation band, indicating that Ba₃La₂(BO₃)₄:Ce³⁺,Dy³⁺ phosphors can be considered as a potential candidate for ultraviolet-based white light-emitting diodes.