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Exploring optical properties of La2Hf2O7:Pr3+ nanoparticles under UV and X-ray excitations for potential lighting and scintillating applications

Abstract

New optical materials with efficient luminescent and scintillating properties have drawn great attention due to the demand for optoelectronic devices and medical theronostics. Their nanomaterials are expected to reduce cost while incrementing efficiency for potential scintillator applications. In this study, we have developed doped lanthanum hafnate pyrochlore nanoparticles (NPs) using a low temperature molten salt synthesis. XRD and Raman investigations confirmed ordered pyrochlores phase for the as-synthesized undoped and Pr3+ doped lanthanum hafnate NPs. Emission profile displayed involvement of both 3P0 and 1D2 states in the photoluminescence process, however the intensity of emission from 1D2 states was found to be higher than that from 3P0 states. This can have huge implication in designing novel red phosphor for possible application in solid state lighting. As a function of Pr3+ concentration, we found that the 0.1 % Pr3+ doped sample possesses the strongest emission intensity with a quantum yield of 20.54 ± 0.1%. Concentration quenching in this case is mainly induced by cross-relaxation process 3P0 + 3H4 → 1D2 + 3H6. Emission kinetics studies shows that fast decaying species arises because of Pr3+ ions occupying Hf4+ site whereas slow decaying species can be attributed to Pr3+ ions occupying La3+ site of the pyrochlore structure of La2Hf2O7. X-ray excited luminescence (XEL) showed strong red-light emission, manifesting that the material is a promising scintillator for radiation detection. Also, photon counts were found to be much higher when NPs is exposed to X-ray compared to ultraviolet light. Altogether, these La2Hf2O7:Pr3+ NPs have the potential to be a good down conversion phosphor as well as scintillator material.

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Publication details

The article was received on 21 Feb 2018, accepted on 07 Apr 2018 and first published on 16 Apr 2018


Article type: Paper
DOI: 10.1039/C8NJ00895G
Citation: New J. Chem., 2018, Accepted Manuscript
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    Exploring optical properties of La2Hf2O7:Pr3+ nanoparticles under UV and X-ray excitations for potential lighting and scintillating applications

    J. P. Zuniga, S. K. Gupta, M. Pokhrel and Y. Mao, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ00895G

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