Photoluminescence of green nanophosphors Sr₂MgSi₂O₇ doped with Tb³⁺ under 374-nm excitation*

Abstract

A series of Sr2MgSi2O7:Tb3+ nanophosphors is prepared using a high-temperature solid-state reaction. The x-ray diffraction patterns show that the crystal structure of the sample is not significantly affected by Tb3+ ions. However, the images of the scanning electron microscope illustrate that the average size of nanoparticles becomes larger with the increase of Tb3+ concentration. Unlike earlier investigations on down-conversion emission of Tb3+ ion excited by deep ultraviolet light, in this work, the photoluminescence characteristics of Sr2MgSi2O7 nanophosphors doped with different Tb3+ concentrations are analyzed under 374-nm excitations. The intense green emission at 545 nm is observed at an optimal doping concentration of 1.6 mol%. The main reason for the concentration quenching is due to the electric dipole–electric dipole interaction among Tb3+ ions.

Thermally enhanced photoluminescence and temperature sensing properties of Sc2W3O12:Eu3+ phosphors

“…Photoluminescence (PL) and PL excitation (PLE) spectra were measured by using a fluorescence spectrophotometer (F-7000, Hitachi) equipped with a high-temperature fluorescence controller (TAP-02). x-mol% Eu 3+ phosphors (x = 6, 10, 14,18,22,26,30,34). The diffraction peaks of samples are well matched with the standard patterns of Sc 2 W 3 O 12 (PDF#89-4690), demonstrating the successful synthesis of Sc 2 W 3 O 12 pure phase.…”

“…Figure 1(a) shows the XRD results of Sc 2 W 3 O 12 :x-mol% Eu 3+ phosphors (x = 6, 10,14,18,22,26,30,34). The diffraction peaks of samples are well matched with the standard patterns of Sc 2 W 3 O 12 (PDF#89-4690), demonstrating the successful synthesis of Sc 2 W 3 O 12 pure phase [23].…”

“…To explore the interaction type of the activator in Sc 2 W 3 O 12 :Eu 3+ phosphors, the Dexter theory is employed in Fig. 3(d): [26][27][28][29][30] ln…”

Improvement of Luminescence Characteristics of ZnGa2O4:Tb3+ Nanophosphors by Ce3+ Codoping

“…It should be noted that the change trend of PL intensity as a function of the Ce 3 + or Tb 3 + concentration takes on a bimodal structure, which is similar to the existing reports. [43][44][45][46] We further studied the long afterglow characteristics of ZnGa 2 O 4 :1.7Tb 3 + and ZnGa 2 O 4 :1.7Tb 3 + ,0.5Ce 3 + nanophosphors still using the F-4600 Fluorescence Spectrometer. The samples are irradiated for 20 min with 280 nm ultraviolet light from a xenon lamp before the pump source is turned off.…”

Intense Photoluminescence and Mechanoluminescence of Novel BaLaAl3O7 : xEu3+ Red Nanophosphors

“…In addition, various rare earth ions (e. g. trivalent terbium ions) also exhibit two optimized concentrations under high doping conditions. [14,37] The emission spectra of the BaLaAl 3 O 7 : xEu 3 + nanophosphors under the ultraviolet excitation at 305 nm are shown in Figure 5. In the wavelength range of 575-675 nm, there exist an intense and narrow peak at 615 nm, which originates from the 5 D 0 -7 F 2 transition of the Eu 3 + ion (the full width at half maximum is about 7 nm), and a weak peak at 595 nm, which belongs to the transition of the same ion from 5 D 0 to 7 F 1 .…”