A Novel Facile Room Temperature Chemical Lithiation for Reduction of Eu<sup>3+</sup> in NASICON Crystal Structure

Highly efficient inorganic phosphors are desirable for lighting-emitting diode light sources, and increasing the doping concentration of activators is a common approach for enhancing the photoluminescence quantum yield (PLQY). However, the constraint of concentration quenching poses a great challenge for improving the PLQY. Herein, we propose a fundamental design principle by separating activators and prolonging their distance in Eu2+-activated Rb3Y(PO4)2 phosphors to inhibit concentration quenching, in which different quenching rates are controlled by the Eu distribution at various crystallographic sites. The blue-violet-emitting Rb3Y(PO4)2:xEu (x = 0.1%–15%) phosphors, with the occupation of Rb1, Rb2 and Y sites by Eu2+, exhibit rapid luminescence quenching with optimum external PLQY of 10% due to multi-channel energy migration. Interestingly, as the Eu concentration increases above 20%, Eu2+ prefer to occupy the Rb1 and Y sites with separated polyhedra and large interionic distances, resulting in green emission with suppressed concentration quenching, achieving an improved external PLQY of 41%. Our study provides a unique design perspective for elevating the efficiency of Eu2+-activated phosphors toward high-performance inorganic luminescent materials for full-spectrum lighting.

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Energy Transfer Processes in NASICON-Type Phosphates under Synchrotron Radiation Excitation

Krutyak

Nagirnyi

Romet

et al. 2023

Symmetry

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The luminescence properties of NASICON-type Na3.6M1.8(PO4)3 (M = Y, Lu) and Na3Sc2(PO4)3 phosphates, undoped and rare earth-doped (RE = Tb3+, Dy3+, Eu3+, Ce3+), were studied using synchrotron radiation in a wide energy region of 4.5–45 eV. Intrinsic emission originating from self-trapped excitons with electron component localized at the 3d Sc states was detected in both doped and undoped Na3Sc2(PO4)3 while only defect-related emission was registered in Na3.6M1.8(PO4)3. Emission of RE ions substituting three-valent cations in low-symmetry sites was detected in all doped phosphates. The efficiency and pass ways of energy transfer from the host to emission centres were analysed based on luminescence excitation spectra. It is shown that the most efficient energy transfer is realized in Tb3+-doped phosphors, while it was poor for other RE ions. The differences in energy transfer efficiencies are explained by different position of RE f states in the crystal electronic band structure influencing the efficiency of charge carrier trapping in the substance. Based on excitation spectra analysis, the bandgap values were estimated to ~8 eV for all studied phosphates.

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A Novel Facile Room Temperature Chemical Lithiation for Reduction of Eu³⁺ in NASICON Crystal Structure

Cited by 3 publications

References 24 publications

Luminescence properties and energy transfer studies of color tunable Tb3+-doped RE1/3Zr2(PO4)3 (RE = Y, La, Gd and Lu)

Luminescence properties and energy transfer studies of color tunable Tb3+-doped RE1/3Zr2(PO4)3 (RE = Y, La, Gd and Lu)

Suppressed concentration quenching and tunable photoluminescence in Eu2+-activated Rb3Y(PO4)2 phosphors for full-spectrum lighting

Energy Transfer Processes in NASICON-Type Phosphates under Synchrotron Radiation Excitation

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A Novel Facile Room Temperature Chemical Lithiation for Reduction of Eu3+ in NASICON Crystal Structure

Cited by 3 publications

References 24 publications

Luminescence properties and energy transfer studies of color tunable Tb3+-doped RE1/3Zr2(PO4)3 (RE = Y, La, Gd and Lu)

Luminescence properties and energy transfer studies of color tunable Tb3+-doped RE1/3Zr2(PO4)3 (RE = Y, La, Gd and Lu)

Suppressed concentration quenching and tunable photoluminescence in Eu2+-activated Rb3Y(PO4)2 phosphors for full-spectrum lighting

Energy Transfer Processes in NASICON-Type Phosphates under Synchrotron Radiation Excitation

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Product

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A Novel Facile Room Temperature Chemical Lithiation for Reduction of Eu³⁺ in NASICON Crystal Structure