Second-Sphere Polyhedron-Distortion-Induced Broadened and Red-Shifted Emission in Lu 3 (Mg x Al 2- x )(Al 3- x Si x )O 12 :Ce 3+ for Warm WLED
Orange-yellow phosphors with extended broadband emission are highly desirable for warmer white-light-emitting diodes (WLED) with a higher color-rendering index. Targeted phosphors Ce -doped Lu (Mg Al )(Al Si )O ( = 0, 0.25, 0.50, 0.75, and 1.00) were developed by chemical composition modification fo...
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Veröffentlicht in: | Inorganic chemistry 2019-07, Vol.58 (14), p.9108-9117 |
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Hauptverfasser: | , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Orange-yellow phosphors with extended broadband emission are highly desirable for warmer white-light-emitting diodes (WLED) with a higher color-rendering index. Targeted phosphors Ce
-doped Lu
(Mg
Al
)(Al
Si
)O
(
= 0, 0.25, 0.50, 0.75, and 1.00) were developed by chemical composition modification for luminescent tuning from green to orange-yellow with spectral broadening. The correlation between structure evolution and luminescent properties was elucidated by the local structure, fluorescence lifetime, and Eu
luminescence as a structural probe. The polyhedron distortion in the second-sphere coordination leads to the site differentiation and symmetry degradation of Ce
with the accommodation of (MgSi)
pairs, comprehensively resulting in the red shift (540 → 564 nm) and broadening in emission spectra. The WLED fabrication results demonstrate that the red shift and broadening in the emission of Lu
(Mg
Al
)(Al
Si
)O
:Ce
make it more suitable for the single-phosphor converted warm WLED. |
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ISSN: | 0020-1669 1520-510X |
DOI: | 10.1021/acs.inorgchem.9b00676 |