Enhanced Pr3+ photoluminescence by energy transfer in SrF2 : Eu2+, Pr3+ phosphor

Yagoub, M.Y.A.; Swart, H.C.; Bergman, Peder; Coetsee, E.

doi:10.1063/1.4941833

Cited by 45 publications

(8 citation statements)

References 34 publications

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“…The other cross‐relaxation possibility between the Pr 3+ ions [Pr 3+ ( 3 P 0 ) + Pr 3+ ( 3 H 4 ) → Pr 3+ ( 3 H 6 ) + Pr 3+ ( 1 D 2 )], as shown by the pathway (2) in Fig. has also been reported in the literature . As shown in Fig.…”

Section: Resultssupporting

confidence: 62%

Luminescence, scintillation, and energy transfer in SiO₂ -Al₂ O₃ -B₂ O₃ -Gd₂ O₃ :Ce³⁺ ,Pr³⁺ glasses

Lertloypanyachai¹,

Chewpraditkul²,

Pattanaboonmee³

et al. 2017

Phys. Status Solidi A

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glasses (SABG: Ce,Pr) were prepared by melt quenching under a CO reducing atmosphere. Luminescence properties were investigated under UV and X-ray excitations. A dominant emission band at 430 nm belonging to the Ce 3þ :5d 1 ! 4f transition was observed in the photo-and radio-luminescence spectra. The energy transfer occurs from this Ce 3þ band toward the 3 P J levels of Pr 3þ with an efficiency of up to 24%, followed by the reduction of integrated luminescence intensity with an increasing Pr 3þ concentration. This result is attributed to the increase in the reabsorption of Ce 3þ luminescence and the non-radiative energy transfer toward the 3 P J levels of Pr 3þ . The cross-relaxation process within the Pr 3þ pairs can further diminish the total luminescence yield at high Pr 3þ concentrations. The integral scintillation efficiency and light yield measurements were carried out and compared to the reference Bi 4 Ge 3 O 12 (BGO) crystal.2 Experimental The SABG:Ce,Pr glasses with host composition (in mol.%) of 15SiO 2 -25Al 2 O 3 -30B 2 O 3 -

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Section: Resultssupporting

confidence: 62%

Luminescence, scintillation, and energy transfer in SiO₂ -Al₂ O₃ -B₂ O₃ -Gd₂ O₃ :Ce³⁺ ,Pr³⁺ glasses

Lertloypanyachai¹,

Chewpraditkul²,

Pattanaboonmee³

et al. 2017

Phys. Status Solidi A

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“…[15a,20] Generally, doping of Pr 3þ ion can result in narrow emission in the visible region with very low extinction coefficient, due to its single doping system. [21] However, codoping of Pr 3þ ÀYb 3þ ions can advantageously exhibit wide and intensified visible emission through energy CR between Yb 3þ and Pr 3þ ions.…”

Section: Resultsmentioning

confidence: 99%

Trap‐Assisted Transition Energy Levels of SrF₂:Pr³⁺−Yb³⁺ Nanophosphor in TiO₂ Photoanode for Luminescence Tuning in Dye‐Sensitized Photovoltaic Cells

et al. 2021

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Luminescent nanophosphors as spectral converters offer immense potential for dye‐sensitized photovoltaics (DSPV) to harvest a wide range of the solar spectrum. Herein, a novel structural design of DSPV using a downconversion (dc) nanophosphor layer in the TiO2 photoanode for both indoor (ambient) and outdoor applications is demonstrated. Cubic SrF2:Pr3+−Yb3+ nanoparticles are synthesized by a template‐free hydrothermal technique. The dc nanophosphor absorbs photons of the blue region, leading to emission of a broad luminescence band (green and red), which is well matched with N719‐dye absorption. The mixed‐valence state of Pr ions (Pr3+ and Pr4+) leads to trap‐assisted transition levels, which result in a broad visible emission. For the first time, a unique Pr3+−Yb3+ codoped dc system yielding tuned and intensified luminescence by effective crossrelaxation (CR) with a back energy transfer (BET) mechanism is designed and efficient working of the dc nanophosphor‐layered DSPVs under both outdoor 1 sun (AM 1.5 G) and indoor light (Warm‐3200 K; Day‐5000 K) conditions is demonstrated. Improved efficiency of 9.07% is attained in dc‐dye‐sensitized solar cells (DSSC) compared with a control‐DSSC (8.39%) at 1 sun intensity. Under indoor low‐light conditions (1000 lux), the dc‐DSPV achieves high power conversion efficiencies (PCEs) of 14.85 and 15.9%, respectively. This approach results in a 63.44% increment in output power density for dc‐DSPV compared with the control‐DSPV under LED 3200 K irradiation. These findings suggest that this configuration of dc‐layered DSPV can provide a new strategy for future indoor electronic operations under ambient light conditions.

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“…SrF2:Eu 2+ powder exhibits a relatively narrow and intense spectral band peaking at 418 nm similarly as observed in recent studies of SrF2:Eu phosphors. [13,52,53] The broader blue emission of the S1 and S2 samples, therefore, could be a superposition coming from Eu 2+ ions in the glassy as well as crystalline phases. As already discussed in the EPR section, the SrF2:Eu 2+ signal in the S1 composition samples is barely detectable from the EPR measurements, therefore, its contribution to the luminescence spectra is expected to be insignificant.…”

Section: Pl Studiesmentioning

confidence: 99%

Electron paramagnetic resonance and photoluminescence investigation of europium local structure in oxyfluoride glass ceramics containing SrF2 nanocrystals

et al. 2017

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Different compositions of europium doped aluminosilicate oxyfluoride glass ceramics prepared in air atmosphere have been studied by electron paramagnetic resonance (EPR) and optical spectroscopy methods. X-ray diffraction (XRD) and transmission electron microscopy (TEM) measurements show presence of homogenously distributed SrF2 nanocrystals after the heat treatment of the precursor glass. Efficient Eu 3+ incorporation in the high symmetry environment of glass ceramics is observed from the photoluminescence spectra. EPR spectra indicate Eu 3+ → Eu 2+ reduction upon precipitation of crystalline phases in the glass matrix. For composition abundant with Eu 2+ in the glassy state such behaviour is not detected. Local structure around europium ions is discussed based on differences in chemical compositions.

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Enhanced Pr3+ photoluminescence by energy transfer in SrF2 : Eu2+, Pr3+ phosphor

Cited by 45 publications

References 34 publications

Luminescence, scintillation, and energy transfer in SiO₂ -Al₂ O₃ -B₂ O₃ -Gd₂ O₃ :Ce³⁺ ,Pr³⁺ glasses

Luminescence, scintillation, and energy transfer in SiO₂ -Al₂ O₃ -B₂ O₃ -Gd₂ O₃ :Ce³⁺ ,Pr³⁺ glasses

Trap‐Assisted Transition Energy Levels of SrF₂:Pr³⁺−Yb³⁺ Nanophosphor in TiO₂ Photoanode for Luminescence Tuning in Dye‐Sensitized Photovoltaic Cells

Electron paramagnetic resonance and photoluminescence investigation of europium local structure in oxyfluoride glass ceramics containing SrF2 nanocrystals

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Enhanced Pr3+ photoluminescence by energy transfer in SrF2 : Eu2+, Pr3+ phosphor

Cited by 45 publications

References 34 publications

Luminescence, scintillation, and energy transfer in SiO2 -Al2 O3 -B2 O3 -Gd2 O3 :Ce3+ ,Pr3+ glasses

Luminescence, scintillation, and energy transfer in SiO2 -Al2 O3 -B2 O3 -Gd2 O3 :Ce3+ ,Pr3+ glasses

Trap‐Assisted Transition Energy Levels of SrF2:Pr3+−Yb3+ Nanophosphor in TiO2 Photoanode for Luminescence Tuning in Dye‐Sensitized Photovoltaic Cells

Electron paramagnetic resonance and photoluminescence investigation of europium local structure in oxyfluoride glass ceramics containing SrF2 nanocrystals

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Luminescence, scintillation, and energy transfer in SiO₂ -Al₂ O₃ -B₂ O₃ -Gd₂ O₃ :Ce³⁺ ,Pr³⁺ glasses

Luminescence, scintillation, and energy transfer in SiO₂ -Al₂ O₃ -B₂ O₃ -Gd₂ O₃ :Ce³⁺ ,Pr³⁺ glasses

Trap‐Assisted Transition Energy Levels of SrF₂:Pr³⁺−Yb³⁺ Nanophosphor in TiO₂ Photoanode for Luminescence Tuning in Dye‐Sensitized Photovoltaic Cells