Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 795, Issue -, Pages 134-140Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.04.220
Keywords
Optical materials; Phosphors; Mn4+ ion; Photoluminescence; Deep-red-emitting
Categories
Funding
- National Natural Science Foundation of China [51862015, 21701067, 51602121]
- Foundation of Jiang'xi Educational Committee [GJJ180564]
- Natural Science Foundation of Jiangxi Province [20171BBB2016016]
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Novel deep-red-emitting SrLa2Sc2O7:Mn4+ phosphors with different Mn4+ contents are successfully synthesized in air by the conventional high-temperature solid-state reaction method. The crystal structure, morphology, phase purity, luminescence properties, concentration quenching, decay lifetimes, and temperature dependent emission spectra are systematically investigated and analyzed. SrLa2Sc2O7:Mn4+ phosphor presents broad excitation band with different excitation peaks from 220 nm to 620 nm owing to the O2- - Mn (4+) charge transfer and (4)A(2) -> (T-4(1), T-2(2), and T-2(2)) transitions of Mn4+ ion and shows intense deep-red emission peaking at 704 nm in the range of 650-800 nm because of the E-2 -> (4)A(2) transition of Mn4+ ion. The optimal Mn4+ concentration in SrLa2Sc2O7:Mn4+ phosphor is similar to 0.6 mol %. The chromaticity coordinates of the SrLa2Sc2O7:0.6%Mn4+ phosphor are (x = 0.732, y = 0.268), locating in deep-red region. The mechanism of concentration quenching is inferred to be dipole-dipole interaction. The luminous mechanism, concentration quenching, and temperature quenching are explained by using the Tanabe-Sugano diagram and configurational coordinate diagram of the Mn4+ ion in SrLa2Sc2O7:Mn4+ phosphor. The experimental results on SrLa2Sc2O7:Mn4+ phosphor can offer the helps for the development of other Mn4+ doped deep-red-emitting phosphor. (C) 2019 Elsevier B.V. All rights reserved.
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