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Luminescence characterization of rare earth (RE = Tb, Dy, Eu) ions activated Ca8NaGd(PO4)6F2 halophosphor synthesis by modified Pechini method
Fluorapatite composites Ca 8 NaGd(PO 4 ) 6 F 2 :Dy 3+ , Tb 3+ , and Eu 3+ were successfully synthesised for the first time by the modified Pechini method for different concentrations of Dy, Tb, and Eu. As synthesised, Ca 8 NaGd(PO 4 ) 6 F 2 : x % Dy, Tb, and Eu show intense emission in the blue, gre...
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| Published in: | Journal of materials science. Materials in electronics 2024-04, Vol.35 (11), p.802, Article 802 |
|---|---|
| Main Authors: | , , , , |
| Format: | Article |
| Language: | English |
| Subjects: | |
| Citations: | Items that this one cites |
| Online Access: | Get full text |
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| Summary: | Fluorapatite composites Ca
8
NaGd(PO
4
)
6
F
2
:Dy
3+
, Tb
3+
, and Eu
3+
were successfully synthesised for the first time by the modified Pechini method for different concentrations of Dy, Tb, and Eu. As synthesised, Ca
8
NaGd(PO
4
)
6
F
2
:
x
% Dy, Tb, and Eu show intense emission in the blue, green, and red regions, respectively. In Ca
8
NaGd(PO
4
)
6
F
2
:
x
%Tb
3+
, Dy
3+
shows intense green and blue emission at
λ
ex
= 274 nm, which confirms energy transfer from Gd
3+
to Tb
3+
and Gd
3+
to Dy
3+
. Under
λ
ex
= 274 nm Ca
8
NaGd(PO
4
)
6
F
2
:
x
%Eu
3+
, yellow emission is more intense, while at
λ
ex
= 392 nm red emission is more dominant. Ca
8
NaGd(PO
4
)
6
F
2
with 1% Tb
3+
has a longer decay time of 3.25 ms as compared with that of 1% Dy
3+
and 10% Eu
3+
, which have 1.73 ms and 2.27 ms, respectively. Ca
8
NaGd(PO
4
)
6
F
2
doped with 5% Eu
3+
has a comparatively higher band gap (3.919 eV) than 1% Dy
3+
(3.918 eV) and Tb
3+
(3.914 eV) obtained from the Tauc plot. Ca
8
NaGd(PO
4
)
6
F
2
without an activator shows self-emission at 316 nm under
λ
ex
= 274 nm in the NBUVB region. On analysing the optical properties of the as-prepared Ca
8
NaGd(PO
4
)
6
F
2,
authors suggest that an undoped matrix can be used for phototherapy and that a matrix doped with Eu
3+
, Tb
3+
, and Dy
3+
activator ions becomes a useful candidate for the generation of white LEDs due to emission in the red, green, and blue regions, respectively, with good optical qualities. |
|---|---|
| ISSN: | 0957-4522 1573-482X |
| DOI: | 10.1007/s10854-024-12525-4 |