Lanthanide-doped lanthanum hafnate nanoparticles as multicolor phosphors for warm white lighting and scintillators

被引:103
|
作者
Gupta, Santosh K. [1 ,2 ]
Zuniga, Jose P. [1 ]
Abdou, Maya [1 ]
Thomas, Melonie P. [3 ]
Goonatilleke, Manisha De Alwis [3 ]
Guiton, Beth S. [3 ]
Mao, Yuanbing [1 ,4 ]
机构
[1] Univ Texas Rio Grande Valley, Dept Chem, 1201 West Univ Dr, Edinburg, TX 78539 USA
[2] Bhabha Atom Res Ctr, Radiochem Div, Mumbai 400085, Maharashtra, India
[3] Univ Kentucky, Dept Chem, 505 Rose St, Lexington, KY 40506 USA
[4] Univ Texas Rio Grande Valley, Sch Earth Environm & Marine Sci, 1201 West Univ Dr, Edinburg, TX 78539 USA
基金
美国国家科学基金会;
关键词
Lanthanum hafnate; Pyrochlore; Luminescence; Warm white light; Scintillation; ENERGY-TRANSFER; IONIC-RADII; LUMINESCENCE; RE; DY3+; PHOTOLUMINESCENCE; LA2HF2O7; EU3+; LA; EMISSION;
D O I
10.1016/j.cej.2019.122314
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Designing luminescent materials especially nanomaterials with multifunctional applications is highly challenging and demanding. In this work, we explored pyrochlore La2Hf2O7 nanoparticles (NPs) singly and triply codoped with Eu3+, Tb3+ and Dy3+. Under both ultraviolet and X-ray irradiations, the La2Hf2O7 NPs singly doped with Eu3+, Tb3+ and Dy3+ displayed red, green and yellowish-blue emission, respectively. The concentration quenching study revealed a non-radiative energy transfer in Eu3+ doped La2Hf2O7 NPs, which takes place via dipole-quadrupole mechanism. On the other hand, a dipole-dipole interaction prevails in Tb3+ and Dy3+ doped La2Hf2O7 NPs. Lifetime spectroscopy reveals the stabilization of Eu3+ and Dy3+ ions at La(3+ )site at low doping concentration whereas a fraction of them migrates to Hf4+ site at high doping concentration. For the La2Hf2O7:Tb3+ NPs, Tb3+ ions are localized at Hf4+ site at all doping concentrations. Furthermore, when triply codoped with Eu3+, Tb3+ and Dy3+ ions, the La2Hf2O7 NPs display beautiful warm white light as a new strategy for color tunability through doping percentage. To sum, our complete spectrum of studies on the structure, UV excited photoluminescence, concentration quenching, and local site spectroscopy of the La2Hf2O7:Ln(3+) NPs suggests that they are potential candidates as single-component multicolor-emitting phosphors for lighting and scintillating applications.
引用
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页数:12
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