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Issue 29, 2018
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The crystal structure and luminescence properties of a novel green-yellow emitting Ca1.5Mg0.5Si1−xLixO4−δ:Ce3+ phosphor with high quantum efficiency and thermal stability

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Abstract

A novel green-yellow emitting Ca1.5Mg0.5Si1−xLixO4−δ:Ce3+ phosphor with high quantum efficiency and thermal stability was discovered for applications in near ultraviolet pumped white light-emitting diodes. Its crystal structure was determined with a single-particle diagnosis approach. The Si sites in the SiO4 tetrahedra are reported for the first time to accommodate Li+ ions. This substitution, confirmed by 6Li solid-state NMR and T.O.F. neutron powder diffraction, causes a disordered occupation of Ca/Mg in the Ca3MgSi2O8 host and favors a phase transformation at ∼330 °C, which results in the formation of the novel phosphor. The produced phosphor was efficiently excited by near UV light peaking at 365 and 410 nm and produced broad green-yellow emission with peaks at 500 and 560 nm, respectively. Its quantum efficiency reached 88.4% (internal) and 55.7% (external) under excitation at 365 nm, and 80.5% (internal) and 42.7% (external) under excitation at 410 nm, while the decrease of luminescence intensity at 200 °C was small (∼26%). A WLED lamp with a high color rendering index of Ra = 92.8 was produced with the combination of a 365 nm emitting chip with blue emitting BaMgAl10O17:Eu2+, green-yellow emitting CMSL:0.01Ce, and red emitting Sr2Si5N8:Eu2+ phosphors.

Graphical abstract: The crystal structure and luminescence properties of a novel green-yellow emitting Ca1.5Mg0.5Si1−xLixO4−δ:Ce3+ phosphor with high quantum efficiency and thermal stability

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Publication details

The article was received on 31 May 2018, accepted on 02 Jul 2018 and first published on 05 Jul 2018


Article type: Paper
DOI: 10.1039/C8DT02241K
Citation: Dalton Trans., 2018,47, 9834-9844
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    The crystal structure and luminescence properties of a novel green-yellow emitting Ca1.5Mg0.5Si1−xLixO4−δ:Ce3+ phosphor with high quantum efficiency and thermal stability

    W. Ji, Z. Xia, K. Liu, S. Ali Khan, L. Hao, X. Xu, L. Yin, M. S. Molokeev, S. Agathopoulos, W. Yang, X. Ma, K. Sun and I. da Silva, Dalton Trans., 2018, 47, 9834
    DOI: 10.1039/C8DT02241K

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