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Thermal Stabilization and Energy Transfer in Narrow-band Red-emitting Sr[(Mg2Al2)1-y(Li2Si2)yN4]:Eu2+ Phosphors

Abstract

The cuboid-coordinated nitridomagnesoaluminate Sr[Mg2Al2N4]:Eu2+ and a solid solution of Sr1-x[(Mg1-yLiy)2(Al1-ySiy)2N4]:Eux2+ were prepared using all-nitride precursors by gas pressure sintering. X-ray diffraction (XRD) data of the phosphors were validated by Rietveld refinement of synchrotron X-ray powder XRD data with the space group I4/m indexed to a tetragonal crystal system. The 7Li solid-state magic-angle spinning nuclear magnetic resonance (ss-MAS-NMR) data proves the successful incorporation of the Li+-Si4+ couple. The blue-light excitable property with the excitation band peaking at 460 nm gave rise to the emission at 620–630 nm at x = 0.004, with a full-width-at-half-maximum of ~77 nm. The inhomogeneous broadening of the Eu2+ luminescence in the system due to the effective energy transfer from one activator to another was observed which concurrently resulted in spectral peak shifts from ~615 nm to ~680 nm as a function of the amount of Eu2+. The Li+-Si4+-tuned solid solution increased emission intensity without significantly shifting the emission wavelength. Such phenomenon was accompanied by an improvement in thermal stability from Δ = 1348 cm−1 of y = 0, to Δ = 1951 cm−1 for y = 0.1 wherein Δ corresponds to the activation energy from the 5d states to the conduction band. The simple gas pressure sintering strategy using all-nitride starting materials resulted in the desired blue light-excitable narrowband red emitting thermally stabilized phosphor.

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Publication details

The article was received on 07 Dec 2017, accepted on 27 Apr 2018 and first published on 27 Apr 2018


Article type: Paper
DOI: 10.1039/C7TC05613C
Citation: J. Mater. Chem. C, 2018, Accepted Manuscript
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    Thermal Stabilization and Energy Transfer in Narrow-band Red-emitting Sr[(Mg2Al2)1-y(Li2Si2)yN4]:Eu2+ Phosphors

    J. Jr. L. Leaño, T. Lesniewski, A. Lazarowska, S. Mahlik, M. Grinberg, H. Sheu and R. Liu, J. Mater. Chem. C, 2018, Accepted Manuscript , DOI: 10.1039/C7TC05613C

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