Effect of co-doping of alkali metal ions on Ca 0.5 RE 1−x (MoO 4 ) 2 :xEu 3+ (RE = Y, La) phosphors with enhanced luminescence properties
A series of Ca 0.5 RE 1−x (MoO 4 ) 2 : x Eu 3+ ,M + (RE = Y, La; M = Li, K and Na) phosphors were synthesized by a facile hydrothermal method. X-ray diffraction suggested that these phosphors could be indexed to a scheelite tetragonal Ca 0.5 RE 1−x (MoO 4 ) 2 (RE = Y, La) phase with a space group of...
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Veröffentlicht in: | RSC advances 2016, Vol.6 (84), p.80390-80397 |
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Hauptverfasser: | , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | A series of Ca
0.5
RE
1−x
(MoO
4
)
2
:
x
Eu
3+
,M
+
(RE = Y, La; M = Li, K and Na) phosphors were synthesized by a facile hydrothermal method. X-ray diffraction suggested that these phosphors could be indexed to a scheelite tetragonal Ca
0.5
RE
1−x
(MoO
4
)
2
(RE = Y, La) phase with a space group of
I
4
1
/
a
with high purity. FESEM indicated the signs of bi-pyramid-like micro-architectures. Elemental mapping analysis provided evidence of the incorporation and uniform distribution of all the elements. X-ray photoelectron spectroscopy (XPS) confirmed the presence of all the elements. The PL properties of Ca
0.5
RE
1−x
(MoO
4
)
2
:
x
Eu
3+
,M
+
(RE = Y, La; M = Li, K and Na) phosphors were analysed extensively. The obtained results suggest that the characteristic red emission is due to the hypersensitive electric dipole
5
D
0
→
7
F
2
transition. The emission intensity of Ca
0.5
RE
1−x
(MoO
4
)
2
:
x
Eu
3+
,Na
+
(RE = Y, La) is higher than Li
+
and K
+
co-doped Ca
0.5
RE
1−x
(MoO
4
)
2
:
x
Eu
3+
(RE = Y, La). This can be explained by the charge compensation effect. Judd–Ofelt theory was adopted to examine the photophysical properties. The luminescence decay time values were estimated. The CIE chromaticity co-ordinates were derived from the emission spectra and the values were found to be close to the NTSC standard values. Hence, the prepared phosphors are suitable for display applications. |
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ISSN: | 2046-2069 2046-2069 |
DOI: | 10.1039/C6RA16753E |