Pressure-induced site swapping, luminescence quenching, and color tunability of Gd2Hf2O7:Eu3+ nanoparticles
نویسندگان
چکیده
High-pressure (HP) studies have been an active research area in fundamental physics and to meet demand of several technological applications. In this paper, we explored the HP effect on optical properties pyrochlore Gd2Hf2O7:5%Eu3+ (GHOE) nanoparticles (NPs). We investigated aspects their under such as charge transfer transitions, emission dynamics, asymmetry ratio, excited state lifetime, color coordinates. photoluminescence (PL) spectra indicate irreversible complete disappearance beyond ~5.4 GPa (up 53 GPa) owing reduced density around O2− ion GHOE NPs. Elevated pressure induces peak broadening, evolution from 5D1/5D2 states, reduction 5D0 → 7F2 red intensity due enhanced defect cross relaxation. Moreover, there is systematic ratio which suggests improving symmetry Eu3+ covalency Eu–O bond. PL lifetime spectroscopy that a large fraction ions localized at Gd3+ site lower same changes symmetric Hf4+ with increasing pressure. Color coordinate value indicates induced tunability red-orange-yellow domain. Hence, demonstrated swapping, luminescence quenching, change, NPs for high materials.
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ژورنال
عنوان ژورنال: Optical Materials
سال: 2021
ISSN: ['1873-1252', '0925-3467']
DOI: https://doi.org/10.1016/j.optmat.2020.110789