Temperature sensing by means of a near-infrared luminescent Ca8NaBi(PO4)6F2:Nd3+ fluorapatite phosphor
Microrods of calcium sodium bismuth fluorapatite doped with neodymium, denoted as Ca 8 NaBi 1-x Nd x (PO 4 ) 6 F 2 (with x ranging from 0 to 0.5), were synthetized using a modified Pechini sol–gel method. The crystalline structure of these phosphors was refined using the Rietveld method and exhibite...
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Published in | Journal of materials science. Materials in electronics Vol. 35; no. 13; p. 890 |
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Main Authors | , , , , , , , , , |
Format | Journal Article |
Language | English |
Published |
New York
Springer US
01.05.2024
Springer Nature B.V |
Subjects | |
Online Access | Get full text |
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Summary: | Microrods of calcium sodium bismuth fluorapatite doped with neodymium, denoted as Ca
8
NaBi
1-x
Nd
x
(PO
4
)
6
F
2
(with x ranging from 0 to 0.5), were synthetized using a modified Pechini sol–gel method. The crystalline structure of these phosphors was refined using the Rietveld method and exhibited hexagonal symmetry with space group P6
3
/m—C
2
6h
, where the lattice parameters were
a
= 9.3855(5) Å and
c
= 6.8998(6) Å for
x
= 0.2. The particles morphology was analyzed through SEM, revealing an average length of approximately 1.5 µm. When excited at 808 nm, the Ca
8
NaBi(PO
4
)
6
F
2
:0.2Nd
3+
microrods emitted strongly at 872, 957 and 1055 nm, falling within the near-infrared region. These emissions correspond to the
4
F
3/2
→
4
I
9/2
(P2),
4
F
5/2
→
4
I
11/2
(P3),
4
F
3/2
→
4
I
11/2
(P1) transitions of Nd
3+
ions, respectively, and are situated within the first and second biological windows. The luminescence lifetime of the
4
F
3/2
state of Nd
3+
was measured to be 294.4 µs for the sample with the lowest Nd
3+
concentration of
x
= 0.05. In addition, the luminescence intensity ratios P2/P1 and P3/P1 were found to be temperature dependent, potentially making it suitable for luminescent ratiometric thermal sensing. These findings suggest that the synthesized Ca
8
NaBi(PO
4
)
6
F
2
:Nd
3+
microrod thermometers exhibit favorable characteristics in terms of relative sensitivity, temperature uncertainty, and repeatability within the temperature range of 303–403 K. |
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ISSN: | 0957-4522 1573-482X |
DOI: | 10.1007/s10854-024-12587-4 |