“…It can present two characteristic emission bands in the luminescence spectrum, 4 F 9/2 → 6 H 15/2 at 480 nm (blue) and 4 F 9/2 → 6 H 13/2 at 572 nm (yellow) . Many Dy 3+ -doped phosphors such as LiLuF 4 :Dy 3+ , Gd 2 O 3 :Dy 3+ , Dy 3+ -doped oxyfluorosilicate glass, and Ba 2 Y 3 (SiO 4 ) 3 F:Dy 3+ reported white emission of Dy 3+ . On the other hand, Sm 3+ is also a promising activator for orange-red emission for applications in lasing, remote sensing, and telecommunication .…”
Lanthanide (Ln)-doped inorganic materials are widely used in X-ray scintillation, enabling luminescence in the UV to near-infrared region with average lifetime ranging from nanosecond to hours. Fluoride-based inorganic scintillators are favorable due to the low self-absorption. With this motivation, for the first time, this research examines photoluminescence and cathodoluminescence (CL) properties of Dy 3+ -and Sm 3+ -doped Ba 2 HfF 8 (BHF). Singly doped BHF emitted characteristic emission from the doped Ln 3+ ions under UV excitation. The Dy 3+ emission shows only two emission bands, i.e., blue and yellow, ideal for white light emission. Our results clarify the nature of energy transfer between Dy 3+ and Sm 3+ ions in the binary-doped BHF:DySm. No sensitized-type energy transfer was present among the two dopants. However, nonradiative cross-relaxation energy transfer was present between Dy 3+ and Sm 3+ ions, causing the deleterious effect on the overall emission intensity of the Dy 3+ activator ion. The cathode ray-induced CL indicated that all of the samples were extremely sensitive under high-energy irradiation, emitting visible photons. The present material is a promising white-emitting phosphor for white light-emitting diodes and an X-ray scintillator for visible emission.
“…It can present two characteristic emission bands in the luminescence spectrum, 4 F 9/2 → 6 H 15/2 at 480 nm (blue) and 4 F 9/2 → 6 H 13/2 at 572 nm (yellow) . Many Dy 3+ -doped phosphors such as LiLuF 4 :Dy 3+ , Gd 2 O 3 :Dy 3+ , Dy 3+ -doped oxyfluorosilicate glass, and Ba 2 Y 3 (SiO 4 ) 3 F:Dy 3+ reported white emission of Dy 3+ . On the other hand, Sm 3+ is also a promising activator for orange-red emission for applications in lasing, remote sensing, and telecommunication .…”
Lanthanide (Ln)-doped inorganic materials are widely used in X-ray scintillation, enabling luminescence in the UV to near-infrared region with average lifetime ranging from nanosecond to hours. Fluoride-based inorganic scintillators are favorable due to the low self-absorption. With this motivation, for the first time, this research examines photoluminescence and cathodoluminescence (CL) properties of Dy 3+ -and Sm 3+ -doped Ba 2 HfF 8 (BHF). Singly doped BHF emitted characteristic emission from the doped Ln 3+ ions under UV excitation. The Dy 3+ emission shows only two emission bands, i.e., blue and yellow, ideal for white light emission. Our results clarify the nature of energy transfer between Dy 3+ and Sm 3+ ions in the binary-doped BHF:DySm. No sensitized-type energy transfer was present among the two dopants. However, nonradiative cross-relaxation energy transfer was present between Dy 3+ and Sm 3+ ions, causing the deleterious effect on the overall emission intensity of the Dy 3+ activator ion. The cathode ray-induced CL indicated that all of the samples were extremely sensitive under high-energy irradiation, emitting visible photons. The present material is a promising white-emitting phosphor for white light-emitting diodes and an X-ray scintillator for visible emission.
“…The PL processes of the co-doped Ba 1.3 Ca 0.7- x - y SiO 4 : x D y 3+ / y Tb 3+ ( x = 0.03 and y = 0.01–0.05) phosphors were examined by excitation and emission spectroscopy. As shown in figure 5 a , the spectrum shows the five excitation bands including the four excitation bands of Tb 3+ ions ( 7 F 6 → 5 L 7,8 (341 nm), 7 F 6 → 5 L 9 (351 nm), 7 F 6 → 5 L 10 (370 nm) and 7 F 6 → 5 G 6 (378 nm) transitions) and one excitation bands of D y 3+ ions ( 6 H 15/2 → 6 P 3/2 (337 nm) transition) [44]. Figure 5( a ) Excitation and ( b ) emission spectra of co-doped Ba 1.3 Ca 0.7- x - y SiO 4 : x D y 3+ / y Tb 3+ ( x = 0.03 and y = 0.01–0.05) phosphors, when the emission wavelength (λnormalem) is 545nm and the excitation wavelength (λnormalexc) is 351nm, respectively.…”
Section: Resultsmentioning
confidence: 99%
“…Here, the elongated decay time for the co-doped phosphors in figure 7b suggests an additional relaxation pathway, leading to the nonexponential nature. For understanding the PL processes, the non-exponential decay curves were fitted according to Inkuti and Hirayama's model [44,46],…”
Section: Photoluminescence Processes In Dymentioning
confidence: 99%
“…The PL processes of the co-doped Ba 1.3 Ca 0.7-x-y SiO 4 : xDy 3+ /yTb 3+ (x = 0.03 and y = 0.01-0.05) phosphors were examined by excitation and emission spectroscopy. As shown in figure 5a, the spectrum shows the five excitation bands including the four excitation bands of Tb 3+ ions ( 7 F 6 → 5 L 7,8 (341 nm), 7 F 6 → 5 L 9 (351 nm), 7 F 6 → 5 L 10 (370 nm) and 7 F 6 → 5 G 6 (378 nm) transitions) and one excitation bands of Dy 3+ ions ( 6 H 15/2 → 6 P 3/2 (337 nm) transition) [44].…”
Section: Photoluminescence Processes In Dymentioning
The
τ
-phase Ba
1.3
Ca
0.7-
x
-
y
SiO
4
:
x
D
y
3+
/
y
Tb
3+
phosphors co-doped with D
y
3+
(
x
= 0.03) and Tb
3+
(
y
= 0.01–0.05) trivalent rare-earth ions were prepared by the gel-combustion method. The structure–property relation of the samples was examined by X-ray diffraction, scanning electron microscopy and spectrophotometer. Here, the effect of Tb
3+
's concentration on the spectroscopic properties of Ba
1.3
Ca
0.7-
x
-
y
SiO
4
:
x
D
y
3+
/
y
Tb
3+
phosphors was explored by using the photoluminescence excitation, emission and decay curves. Importantly, the photonic energy transfer from (D
y
3+
:
4
F
9/2
+ Tb
3+
:
7
F
6
) to (D
y
3+
:
6
H
15/2
+ Tb
3+
:
5
D
4
) was observed, in which the D
y
3+
ions act as a light-emitting donor whereas the Tb
3+
ions as a light-absorbing acceptor, resulting in an enhanced emission from the co-doped Ba
1.3
Ca
0.7-
x
-
y
SiO
4
:
x
D
y
3+
/
y
Tb
3+
(
x
= 0.03 and
y
= 0.01–0.05) phosphors. Finally, the chromaticity coordinates were determined from the measured emission spectra, locating at the green and white light regions. This observation indicates that the characteristic emission colour could be tuned from white to green by varying Tb
3+
concentrations under ultraviolet light.
“…In the elds of white LED, yellow laser and vacuum ultraviolet emission, it shows certain research value and application potential. [26][27][28][29][30] However, as far as we know, there are few reports on the scintillation properties of this material and the development of related exible devices. In order to explore exible scintillation materials with simple preparation method and high spatial resolution of X-ray imaging, we investigated the related properties of LiLuF 4 :Tb nanocrystalline materials.…”
The flexible scintillation film has high X-ray imaging spatial resolution, in which LiLuF4:15% Tb scintillation nanocrystals have excellent radioluminescence properties and low detection limits.
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