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Selectivity of Mn2+ ion occupancy and energy transfer of Ce3+ → Mn2+ ions in garnet solid solution

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Abstract

As a luminous center, Mn2+ has the advantages of high efficiency, safety, and low cost, and has been widely used to improve the color rendering index of garnet structured phosphors. Although the position of Mn2+ in garnet structures and its corresponding spectrum have been widely discussed, there is no convincing conclusion. In this paper, the selectivity of Mn2+ ion occupancy in the Y3Al5O12:0.1Ce3+,yMn2+ (y = 0–0.22) garnet structure and their corresponding emission spectra were determined. At low substitution density, Mn2+ ions (y = 0–0.007) easily replace Al3+ ions in the octahedron and emit 590 nm red light under 450 nm blue light excitation, which were determined by calculating the formation energy of the (Mn/Al) and (Mn/Y) local coordination and powder XRD analysis. Upon increasing the Mn2+ concentration from 0.007 to 0.22, the emission light with a peak at 750 nm gradually appears. Meanwhile, the effect of Y3+ ions on the energy transfer of Ce3+ → Mn2+ in (Lu1−xYx)3Al4.8Si0.2O12:0.1Ce3+,0.2Mn2+ (x = 0–1) is achieved through the reduction of the distance between Ce3+ and Mn2+ ions in the dodecahedron. The above work provides support for the correct understanding of the luminescence behavior of Mn2+, and the influence of the microstructure on the energy transfer of Ce3+ → Mn2+ ions. Finally, high color rendering index (83.4) wLEDs were fabricated by the Lu1.2Y1.8Al4.8Si0.2O12:0.1Ce3+,0.2Mn2+ phosphor and the blue chip under 120 mA.

Graphical abstract: Selectivity of Mn2+ ion occupancy and energy transfer of Ce3+ → Mn2+ ions in garnet solid solution

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Article information


Submitted
20 Aug 2020
Accepted
22 Sep 2020
First published
23 Sep 2020

J. Mater. Chem. C, 2020, Advance Article
Article type
Paper

Selectivity of Mn2+ ion occupancy and energy transfer of Ce3+ → Mn2+ ions in garnet solid solution

M. Cai, S. Fang, T. Han, D. T. Valiev, T. Lang, Y. Zhong, C. Wang, A. N. Yakovlev and E. F. Polisadova, J. Mater. Chem. C, 2020, Advance Article , DOI: 10.1039/D0TC03960H

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