Journal
CHEMICAL ENGINEERING JOURNAL
Volume 379, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.122314
Keywords
Lanthanum hafnate; Pyrochlore; Luminescence; Warm white light; Scintillation
Categories
Funding
- National Science Foundation [1710160, 1455154, 1355438]
- United States-India Education Foundation (USIEF, India)
- Institute of International Education (IIE, USA) [2268/FNPDR/2017]
- [ECCS-1542174]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1455154] Funding Source: National Science Foundation
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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.
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