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Article Abstract
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(MgAl)(AlSi)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(MgAl)(AlSi)O:Ce make it more suitable for the single-phosphor converted warm WLED.
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| http://dx.doi.org/10.1021/acs.inorgchem.9b00676 | DOI Listing |
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