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• W4210511788 endingPage "112062" @default.
• W4210511788 startingPage "112062" @default.
• W4210511788 abstract "Here in this work, we aim to develop both red and near white light emitting phosphor materials using Eu3+ and Tb3+ as co-dopant ions and NaLaF4 as host matrix. It was observed that both Na and La atom possess two different types of lattice sites having different co-ordination and symmetry. We have theoretically calculated the substitution energies for Eu3+ and Tb3+ ions for all the available lattice sites and found that the preference of distribution of the dopant ions into these lattice sites is different. While Eu3+ ion prefers 9-coordinated Na1/La2 site and 6-coordinated Na2 site, Tb3+ prefers 9-coordinated La1 site. This is also reflected in the PL study of both pure Eu3+ and Eu3+-Tb3+ co-doped compounds. Substitution of Eu3+ ion at Na2 site results in short-lifetime value and highly intense red ED line as observed from time resolved spectra analysis at different delay time. On contrary, its lifetime value was found to be higher at 9-coordinated La2 site and resulting higher intense orange MD line. Defect centres, which are being created due to charge imbalance during substitution at Na site, is solely responsible for such behaviour. Increasing concentration of Eu3+ ions also resulted in higher red colour purity of the Eu3+ doped compound due to more defect induced asymmetry surrounds Eu3+ ion. For the Eu3+-Tb3+ co-doped compounds, the Tb3+→Eu3+ energy transfer dynamic is responsible for tuneable emission colour characteristics from white light to red. From lifetime study with varied concentration of Tb3+ ion, we have observed that the possibility of charge transfer from Tb3+ ion at Na-site (Tb3+Na1) to Eu3+ ion at Na2 (Eu3+Na2) is more compared to that from Tb3+La2 to Eu3+Na2." @default.
• W4210511788 created "2022-02-08" @default.
• W4210511788 creator A5020697222 @default.
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• W4210511788 date "2022-02-01" @default.
• W4210511788 modified "2023-09-23" @default.
• W4210511788 title "Generating pure red and near white light in NaLaF4 microcrystal by controlling site-selective luminescence of Eu3+ and Tb3+ dopant ions" @default.
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• W4210511788 doi "https://doi.org/10.1016/j.optmat.2022.112062" @default.
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