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Issue 13, 2018
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Site occupation and energy transfer of Ce3+-activated lithium nitridosilicate Li2SrSi2N4 with broad-yellow-light-emitting property and excellent thermal stability

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Abstract

The abundant nitridosilicate-based phosphors have been found due to the various connection types of [SiN4] tetrahedron such as corner-, edge- and even face-shared structures. The stable and tight frameworks formed by the [SiN4] tetrahedron lead to excellent luminescence properties. In this study, the lithium nitridosilicate Li2SrSi2N4 with a special crystal structure has been successfully synthesized by gas pressure sintering. The Rietveld refinement indicates that Li2SrSi2N4 is made up of two kinds of [SiN4] tetrahedron rings called dreier and siebener rings, and it is more stable than the structure formed by chains. Moreover, the channel built by the ring provides a suitable location for the cations to occupy. With the introduction of Ce3+ ions, the yellow light centering at 553 nm has been observed, and the broad excitation band ranging from 250 to 450 nm matches well with that of blue LED chips. Additionally, two Sr2+ sites occupied by Ce3+ ions broaden the emission band including the red region, and the energy transfer happens between the two sites, which has been proved by the time-resolved photoluminescence (TRPL) spectra. When compared with commercial YAG:Ce3+, Li2SrSi2N4:Ce3+ not only has a broad emission band leading to the decrease in CCT, but also presents excellent thermal stability; at 150 °C the emission intensity still remains beyond 90% of the initial intensity at room temperature. The results indicate that this special crystal structure is worthy of further investigation for practical applications.

Graphical abstract: Site occupation and energy transfer of Ce3+-activated lithium nitridosilicate Li2SrSi2N4 with broad-yellow-light-emitting property and excellent thermal stability

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Publication details

The article was received on 26 Sep 2017, accepted on 23 Feb 2018 and first published on 05 Mar 2018


Article type: Paper
DOI: 10.1039/C7TC04397J
Citation: J. Mater. Chem. C, 2018,6, 3435-3444
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    Site occupation and energy transfer of Ce3+-activated lithium nitridosilicate Li2SrSi2N4 with broad-yellow-light-emitting property and excellent thermal stability

    J. Ding, H. You, Y. Wang, B. Ma, X. Zhou, X. Ding, Y. Cao, H. Chen, W. Geng and Y. Wang, J. Mater. Chem. C, 2018, 6, 3435
    DOI: 10.1039/C7TC04397J

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