In:
Journal of the American Ceramic Society, Wiley, Vol. 100, No. 7 ( 2017-07), p. 3050-3060
Abstract:
A series of novel green emission W hitlockite‐type Ca 8 ZnLa(PO 4 ) 7 :Eu 2+ and color tunable Ca 8 ZnLa(PO 4 ) 7 :Eu 2+ ,Mn 2+ phosphors were prepared by the solid‐state reaction method in a reducing atmosphere. Its crystal structure and phase composition were identified by high‐resolution transmission electron microscopy, selected area electronic diffraction, X ‐ray photoelectron spectroscopy, and X ‐ray powder diffraction R ietveld refinement, and it was found to be trigonal, belonging to R ‐3 c (161) space group. The luminescence properties of Eu 2+ singly doped and Eu 2+ /Mn 2+ codoped Ca 8 ZnLa(PO 4 ) 7 phosphors were revealed in detail. Ca 8 ZnLa(PO 4 ) 7 :Eu 2+ is excitable over a broad range from 200 to 450 nm with a prominent green emitting. With varied Eu 2+ /Mn 2+ ratios, fine‐tune emission under 365 nm excitation can be achieved from green (0.221, 0.468) to magenta (0.391, 0.276), especially the warm white light (0.392, 0.352), and CCT 3500 K can be obtained by the process of energy transfer between Eu 2+ and Mn 2+ . The ET mechanism in this system is managed via the dipole‐dipole interaction with the maximum energy‐transfer efficiency 82.8% based on the decay lifetime data. These results suggest that as‐prepared phosphors can serve as promising candidates of UV ‐pumped w‐ LED s.
Type of Medium:
Online Resource
ISSN:
0002-7820
,
1551-2916
DOI:
10.1111/jace.2017.100.issue-7
Language:
English
Publisher:
Wiley
Publication Date:
2017
detail.hit.zdb_id:
2008170-4
detail.hit.zdb_id:
219232-9
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