Effect of Host Structure and Concentration on the Luminescence of Eu³⁺ and Tb³⁺ in Borate Phosphors

Abstract

Eu3+ and Tb3+ doped in nanocrystalline InBO3, GdBO3, and LaBO3 having three different morphs of calcite (CaCO3) such as Calcite, Vaterite, and Aragonite, respectively, were synthesized by glycine–nitrate combustion method. Luminescence due to Eu3+ and Tb3+ doped individually as well as simultaneously in these three different morphs of calcite were investigated and compared. Also the effect of concentration of dopant ions on the luminescence was studied. The highest photoluminescence emission intensity was observed for RE0.05M0.95BO3 (RE = Eu3+, Tb3+, M = In, Gd, La) samples. Further increase in doping led to concentration quenching of the luminescence. In case of the co‐doped borates, the energy transfer between the co‐doped rare earth ions was influenced by the host crystal structure. This study reveals that there is remarkable effect of the crystal structure of host and concentration of dopant ions on the luminescence.

Fabrication and Luminescence Properties of Transparent Glass‐Ceramics Containing Eu3+‐Doped TbPO4 Nanocrystals

“…(d) shows clearly that the precipitated nanocrystals are well‐dispersed sphere or oval particles. It was reported that particle morphology can affect the luminescence properties and spherical or oval shape may be favorable . The well‐demarcated lattice fringes in the HRTEM image of GC680 indicate that heating at 680°C induces formation of the monodispersed TbPO 4 nanocrystals sized 9–16 nm in the glass matrix, in agreement with the average nanocrystal size calculated from the XRD data.…”

Syntheses and luminescence of La1−xEux[B8O11(OH)5] and β-La1−xEuxB5O9 (0 ≤ x ≤ 0.135)

“…The excitation spectra consist of broad bands in the shorter wavelength region and some sharp peaks in the longer wavelength region. In most Eu 3+ -doped phosphors, the CT absorption is much stronger than the f-f transitions which are parity-forbidden, 11,22,24 while it is not the case in 5 ] is close to noncentrosymmetric, which causes the partial allowance of these f-f transitions. 22,23 These sharp peaks in the region from 280 nm to 550 nm are due to the 4f 6 -4f 6 transitions of Eu 3+ ions, and the detailed assignments are shown in Fig.…”

Na4La2−2xTb2x(CO3)5 nanophosphors: Hydrothermal synthesis and photoluminescence properties

“…Host materials play an important role in the luminescence of phosphors. Up to now, many inorganic host materials were synthesized and used as Tb 3+ doped phosphors, such as oxides, silicates, phosphates, and borates [3][4][5][6][7].…”