Sr/Ba substitution induced higher thermal stability far red-emitting BaSrLaLiWO:Mn phosphors for plant growth applications
A series of red-emitting BaLaLiWO 6 :Mn 4+ (BLLW:Mn 4+ ) phosphors were successfully synthesized by a high-temperature solid-state reaction method. The crystal structure and luminescence properties of the obtained samples were systematically investigated. The emission spectra exhibited a deep red em...
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Published in | Dalton transactions : an international journal of inorganic chemistry Vol. 52; no. 3; pp. 787 - 795 |
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Main Authors | , , , , , , , , |
Format | Journal Article |
Published |
17.01.2023
|
Online Access | Get full text |
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Summary: | A series of red-emitting BaLaLiWO
6
:Mn
4+
(BLLW:Mn
4+
) phosphors were successfully synthesized by a high-temperature solid-state reaction method. The crystal structure and luminescence properties of the obtained samples were systematically investigated. The emission spectra exhibited a deep red emission band peaking at 716 nm with a full width at half-maximum (FWHM) of 44 nm under 340 nm excitation. The optimal Mn
4+
molar concentration was about 1.2%. In addition, the luminescence mechanism was analyzed using a Tanabe Sugano energy level diagram. With the substitution of Sr for Ba, there was a red shift in the emission spectrum and a blue shift in the excitation spectrum. The emission intensity of BLLW:1.2%Mn
4+
at 150 °C was about 22% of the initial value at room temperature. In contrast, the emission intensity of SrLaLiWO
6
:1.2%Mn
4+
still maintained 79% of the initial emission intensity at room temperature at 150 °C. This was due to the fact that with the substitution of Sr for Ba, the W-O bond length gradually decreases, which gradually enhanced the crystal field strength of Mn
4+
.
A series of red-emitting BaLaLiWO
6
:Mn
4+
(BLLW:Mn
4+
) phosphors were successfully synthesized by a high-temperature solid-state reaction method. The SrLLW:Mn
4+
phosphor is a better candidate for plants illumination LED. |
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Bibliography: | https://doi.org/10.1039/d2dt03466b Electronic supplementary information (ESI) available. See DOI |
ISSN: | 1477-9226 1477-9234 |
DOI: | 10.1039/d2dt03466b |