Electronic structure, morphology-controlled synthesis, and luminescence properties of YF3: Eu3
Studying electronic structure plays a key role in improving the photoluminescence (PL) properties of materials. Therefore, the electronic structure of YF 3 : x Eu 3+ with different Eu 3+ ions doping concentrations was explored by first-principles calculations based on density functional theory (DFT)...
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Veröffentlicht in: | Journal of sol-gel science and technology 2021-06, Vol.98 (3), p.497-507 |
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Sprache: | eng |
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Zusammenfassung: | Studying electronic structure plays a key role in improving the photoluminescence (PL) properties of materials. Therefore, the electronic structure of YF
3
:
x
Eu
3+
with different Eu
3+
ions doping concentrations was explored by first-principles calculations based on density functional theory (DFT). As calculated, the YF
3
host had an indirect bandgap of 7.68 eV. From all calculation results we got, the band structure of YF
3
:
x
Eu
3+
exhibited the smallest direct band gap of 6.54 eV when the value of
x
was 0.10. This small direct band gap is beneficial to obtain excellent emission intensity. Besides, the morphologies and sizes have a significant influence on the fluorescence intensity of the products. A series of YF
3
:
x
Eu
3+
phosphors with leaf-like, spindle-like, pecan-like, and granular-like morphologies were obtained by changing the RE
3+
/NaF ratio via a microwave hydrothermal method. At the same time, the formation process of granule-like YF
3
: Eu
3+
was explored through time-dependent experiments. Furthermore, the fluorescence performance of YF
3
:
x
Eu
3+
was studied in detail. The as-obtained YF
3
:
x
Eu
3+
can exhibit orange-red emission under ultraviolet excitation because of the magnetic dipole of the
5
D
0
–
7
F
1
transition of Eu
3+
ions. After comparing the luminescence properties of samples with different morphologies, we found that the sample with granule-like morphology had the highest orange-red emission intensity. The experimental result proved that the appropriate Eu
3+
ions doping concentration were
x
= 0.10, which is highly consistent with the calculation result.
The great orange-red emission intensity was obtained by adjusting the electronic structure and morphology of the YF
3
:
x
Eu
3+
. The electronic structures of YF
3
:
x
Eu
3+
can be altered by changing Eu
3+
doping concentrations. The morphologies can be regulated by changing the RE
3+
/NaF ratio. Besides, the formation process of granule-like YF
3
: 0.1Eu
3+
was explored through time-dependent experiments.
Highlights
The electronic structures of Eu
3+
-doped YF
3
phosphors were studied by DFT calculations.
A series of YF
3
:
x
Eu
3+
phosphors with leaf-like, spindle-like, pecan-like, and granular-like morphologies were obtained by changing the RE
3+
/NaF ratio.
The formation process of granule-like YF
3
: Eu
3+
was explored.
The PL properties based on different morphologies and the concentration of Eu
3+
ions were studied. |
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ISSN: | 0928-0707 1573-4846 |
DOI: | 10.1007/s10971-021-05536-8 |