Concentration effect on the scintillation properties of sol–gel derived LuBO3 doped with Eu3+ and Tb3+

Abstract

Lu 1-x Eu x BO 3 and Lu 1-x Tb x BO 3 powders have been prepared by a sol-gel process with 0 < x < 0.15 for Eu 3+ and 0 < x < 0.05 for Tb 3+. The purity of powders has been verified by X-Ray diffraction and the results confirm that all the materials have the vaterite type even if the calcination has been performed at 800°C. Furthermore, the solid solution for LuBO 3 vaterite is observed up to x=0.15 and x=0.05 for europium and terbium ions respectively. So doping with Eu 3+ or Tb 3+ ions does not affect the structure. These materials have also been analyzed by Fourier Transform Infra Red Spectroscopy. The morphology of the powders has been studied by Scanning Electron Microscopy and shows a very nice morphology with small spherical particles with narrow size distribution. Optical properties have then been studied to confirm the effective substitution of Eu 3+ or Tb 3+ for Lu 3+ ions and to determine the materials scintillation performances. The optima, in term of scintillation yield, are obtained for Eu 3+ and Tb 3+ concentration of x=0.05 in both cases. The afterglows have also been measured and confirm the potentiality of these materials as scintillators.

Luminescence characteristics of Lu0.8Sc0.2BO3:RE3+ (RE=Eu, Tb) polycrystalline powders

“…The most intensive transition is 5 D 4 → 7 F 5 , which results in an overall green emission. The results are well agreement with the previous report about the sol-gel derived LuBO 3 :Eu 3+ /Tb 3+ (Sc-free materials) [34], beside the existence of a STE band in our materials. It is also observed that the 7 F 0 / 7 F 1 and 7 F 1 / 7 F 2 ratios of Eu 3+ -doped materials are changing upon X-ray excitation compared to PL spectra.…”

“…4b shows that the optimal Tb ions doping concentration is 0.3 at% and the corresponding light yield could reach a good value 23,800 ph/MeV. For sol-gel derived LuBO 3 :Eu 3+ /Tb 3+ (Sc-free materials) [34], the optimal scintillation light yield are obtained for Eu 3+ and Tb 3+ content of 5 at% in both cases, namely 8923 ph/MeV and 4398 ph/MeV. By comparison, the light yield of Tb doped LuBO 3 has significantly improved by doping Sc 3+ .…”

Synthesis and luminescent properties of subglobose YBO3:Ln3+(Eu, Tb) phosphors

“…ions and Tb 3? ions and has been used as one of the best hosts of red and green phosphors in the PDPs, the mercury-free fluorescence lamps and bioimaging materials [8][9][10][11]. Up to now, LnBO 3 micro/nanocrystals with abundant morphologies have been synthesized through a variety of techniques, such as hydro/solvothermal techniques, vapor-liquid-solid methods, co-precipitation, solgel routes and solution-combustion method [8][9][10][11][12][13][14][15][16].…”

Hydrothermal synthesis of YBO3:Tb3+ microflowers and their luminescence properties

“…YBO 3 :Tb 3+ phosphor has been synthesized via various routes, such as solid-state reaction [7], sol-gel method [1,8], spray pyrolysis method [9] and hydrothermal method [10]. Compared to the other routes, the hydrothermal method is a promising synthetic route, which can be better controlled from the molecular precursor to the reaction parameters, such as the reaction time and temperature, to give highly pure and homogeneous materials.…”