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Synthesis and luminescence properties of orange–red-emitting Ca9La(VO4)7:Sm3+ phosphors co-doped with alkali metal ions
Orange–red-emitting phosphors Ca 9 La(VO 4 ) 7 :Sm 3+ and Ca 9 La(VO 4 ) 7 :Sm 3+ ,M + (M + = Li + , Na + , and K + ) were synthesized by the combustion method. Their crystal structure, microstructure, luminescence properties, and decay performance were investigated in detail. The results revealed...
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Published in: | Journal of materials science. Materials in electronics 2019-05, Vol.30 (10), p.9184-9193 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Orange–red-emitting phosphors Ca
9
La(VO
4
)
7
:Sm
3+
and Ca
9
La(VO
4
)
7
:Sm
3+
,M
+
(M
+
= Li
+
, Na
+
, and K
+
) were synthesized by the combustion method. Their crystal structure, microstructure, luminescence properties, and decay performance were investigated in detail. The results revealed that the as-prepared samples were crystallized in a trigonal structure (space group of
R3c
, No. 161). Under 405-nm excitation, the Ca
9
La(VO
4
)
7
:Sm
3+
phosphor exhibited excellent orange–red emission. The Sm
3+
ions were quenched at 0.02 equivalents by electric dipole–dipole interactions. After the introduction of alkali metal ions Li
+
, Na
+
, and K
+
, the luminescence properties of the Ca
9
La(VO
4
)
7
:Sm
3+
samples were noticeably enhanced, particularly those of that co-doped with Li
+
. The chromaticity coordinates of Ca
9
La(VO
4
)
7
:0.02Sm
3+
, 0.02Li
+
and Ca
9
La(VO
4
)
7
:0.02Sm
3+
were (0.610, 0.390) and (0.604, 0.395), respectively, close to those of the commercial red phosphor Y
2
O
2
S:Eu
3+
(0.622, 0.351). The results suggested that the Ca
9
La(VO
4
)
7
:0.02Sm
3+
, 0.02Li
+
phosphor may serve as an orange–red emitter for applications in white light-emitting diodes excited by near-ultraviolet radiation. |
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ISSN: | 0957-4522 1573-482X |
DOI: | 10.1007/s10854-019-01247-7 |