Optical and X-ray induced luminescence from Eu3+ doped La2Zr2O7 nanoparticles

JOURNAL OF ALLOYS AND COMPOUNDS

卷:693

Article

Pokhrel, Madhab¹  Alcoutlabi, Mataz²  Mao, Yuanbing¹ 

[1] Univ Texas Rio Grande Valley, Dept Chem, 1201 West Univ Dr, Edinburg, TX 78539 USA

[2] Univ Texas Rio Grande Valley, Dept Mech Engn, 1201 West Univ Dr, Edinburg, TX 78539 USA

关键词: Zirconates;    Europium;    Pyrochlore;    Nanoparticles;    Nanoscintillators;   

DOI  :  10.1016/j.jallcom.2016.09.218

来源: Elsevier

【 摘 要 】

Nanocrystalline complex oxide scintillators have emerged for use in X-ray and gamma-ray detection in recent years. Here the doping concentration dependence of europium-doped lanthanum zirconate (La2Zr2O7: xmol% Eu3+, x = 1 to 35) nanoparticles (NPs) were investigated by using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, scanning electron microscopy (SEM), and optically and X-ray excited luminescence. Spectroscopic methods revealed a gradual increase in disorder from the ordered pyrochlore structure to the defect fluorite structure as the Eu3+ concentration increases. They showed red luminescence under charge transfer band (258 nm), and Eu3+ 4f-4f bands (322, 394 and 465 nm) excitation with optical intensity dependent on the Eu3+ doping concentration and not quenching up to 5% Eu3+ doping concentration. The quantum yield of the red emission was found to depend on the Eu3+ doping concentration and excitation wavelength. Moreover, these La2Zr2O7: x% Eu3+ NPs demonstrated an atypical Eu3+ related scintillating response with a red emission under high-energy X-ray excitation with the scintillation intensity also depending on the Eu3+ doping concentration. Finally, the irradiation damage behavior induced by the excitation source was representatively examined for the La2Zr2O7: 5% Eu3+ NPs. It is expected that the current study will pave the way for future research of nanoscintillators. (C) 2016 Elsevier B.V. All rights reserved.

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