Structural, photoluminescence and radioluminescence properties of Eu3+ doped La2Hf2O7 nanoparticles

被引：37
作者：
Wahid, Kareem
Pokhrel, Madhab
Mao, Yuanbing [1 ]
机构：
[1] Univ Texas Rio Grande Valley, Dept Chem, 1201 West Univ Dr, Edinburg, TX 78539 USA
来源：
JOURNAL OF SOLID STATE CHEMISTRY | 2017年 / 245卷
关键词：
Hafnate; Europium; Pyrochlore; Nanophosphor; Photoluminescence; Radioluminescence; EFFECTIVE IONIC-RADII; LUMINESCENCE PROPERTIES; SCINTILLATION PROPERTIES; PYROCHLORE STRUCTURE; VIBRATIONAL-SPECTRA; TRANSFORMATION; RAMAN; ER; NANOCRYSTALS; A(2)B(2)O(7);
D O I：
10.1016/j.jssc.2016.10.004
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
This study presents the structural, optical, and radioluminescent characterization of newly synthesized europium-doped lanthanum hafnate (La2Hf2O7:xmol%Eu3+, x=0 to 35) nanoparticles (NPs) for use as phosphors and scintillation materials. Samples prepared through a combined co-precipitation and molten salt synthetic process were found to crystalize in the pyrochlore phase, a radiation tolerant structure related to the fluorite structure. These samples exhibit red luminescence under ultraviolet and X-ray excitation. Under these excitations, the optical intensity and quantum yield of the La2Hf2O7:xmol%Eu3+ NPs depend on the Eu3+ concentration and are maximized at 5%. It is proposed that there is a trade-off between the quenching due to defect states/cross-relaxation and dopant concentration. An optimal dopant concentration allows the La2Hf2O7:5 mol%Eu3+ NPs to show the best luminescent properties of all the samples.
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收藏
页码：89 / 97
页数：9
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