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Issue 5, 2019
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Crystal structure analysis and evidence of mixed anion coordination at the Ce3+ site in Y3Al2(Al,Si)3(O,N)12 oxynitride garnet phosphor

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Abstract

The structural and luminescence properties of Ce3+-doped Y3Al4.75Si0.25O11.75N0.25 oxynitride garnet (YASiONG:Ce) phosphor are investigated by neutron powder diffraction (NPD) and spectroscopic measurements, respectively. The obtained NPD patterns confirmed the presence of N atoms in YASiONG:Ce by Rietveld structural refinement for the first time. In addition, we studied the structure and bond lengths of YASiONG and compared the parameters with those of Y3Al5O12 (YAG) using two different models and experimental NPD data. In the photoluminescence (PL) and PL excitation spectra of the YASiONG:Ce phosphor measured at 50 K, additional excitation and emission bands of Ce3+: 4f → 5d1 appeared at longer wavelengths compared with the YAG:Ce phosphor. The additional bands can be attributed to the 4f → 5d1 transition of Ce3+ at the dodecahedral site with one N3− and seven O2− coordination.

Graphical abstract: Crystal structure analysis and evidence of mixed anion coordination at the Ce3+ site in Y3Al2(Al,Si)3(O,N)12 oxynitride garnet phosphor

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Publication details

The article was received on 02 Oct 2018, accepted on 18 Dec 2018 and first published on 20 Dec 2018


Article type: Paper
DOI: 10.1039/C8TC04980G
Citation: J. Mater. Chem. C, 2019,7, 1330-1336

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    Crystal structure analysis and evidence of mixed anion coordination at the Ce3+ site in Y3Al2(Al,Si)3(O,N)12 oxynitride garnet phosphor

    K. Asami, M. Shiraiwa, J. Ueda, K. Fujii, K. Hongo, R. Maezono, M. G. Brik, M. Yashima and S. Tanabe, J. Mater. Chem. C, 2019, 7, 1330
    DOI: 10.1039/C8TC04980G

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