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...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Inorganic chemistry 2019-07, Vol.58 (14), p.9108-9117
Hauptverfasser: Zhou, Yunan, Zhuang, Weidong, Hu, Yunsheng, Liu, Ronghui, Xu, Huibing, Liu, Yuanhong, Li, Yanfeng
Format: Artikel
Sprache:eng
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
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.
ISSN:0020-1669
1520-510X
DOI:10.1021/acs.inorgchem.9b00676