Preparation and characterization of luminescent YPO4: Eu3+ thin films using sol gel spin coating method

Benharrat, L.; Guerbous, L.; Bradai, Djamel; Boukerika, A.; Manseri, A.; Selmi, N.; Rahal, Badis; Hamroun, M.S.E.

doi:10.1016/j.tsf.2019.137738

Cited by 9 publications

(6 citation statements)

References 59 publications

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“…A broad band in the 230–285 nm spectral region with a maximum at 265 nm and a series of sharp peaks in the 300–500 nm wavelength range were simultaneously observed in the excitation spectrum. The former broad band was ascribed to the Eu 3+ –O 2– charge transfer band, while the later sharp peaks at 320, 364, 380, 394, 417, and 465 nm were attributed to the 7 F 0 → 5 H 3 , 7 F 0 → 5 D 4 , 7 F 0 → 5 L 7 , 7 F 0 → 5 L 6 , 7 F 0 → 5 D 3 , and 7 F 0 → 5 D 2 transitions of Eu 3+ ions, respectively. , When Ca 2 LaHf 2 Al 3 O 12 :50%Eu 3+ was excited by 394 nm light, it produced four intense red emission peaks at 592, 614, 659, and 711 nm with the highest intensity at 614 nm, and these red emissions originated from the 5 D 0 → 7 F 1 , 5 D 0 → 7 F 2 , 5 D 0 → 7 F 3 , and 5 D 0 → 7 F 4 transitions of Eu 3+ ions, respectively. − Under daylight, the Ca 2 LaHf 2 Al 3 O 12 :50%Eu 3+ phosphor showed white body color, but it exhibited dazzling red luminescence upon exposure to 365 nm light (Figure b). The CIE chromaticity coordinates (0.6419, 0.3575) for Ca 2 LaHf 2 Al 3 O 12 :50%Eu 3+ were plotted in the CIE chromaticity diagram shown in Figure b.…”

Section: Resultsmentioning

confidence: 97%

Dazzling Red-Emitting Europium(III) Ion-Doped Ca₂LaHf₂Al₃O₁₂ Garnet-Type Phosphor Materials with Potential Application in Solid-State White Lighting

Devakumar

et al. 2022

Inorg. Chem.

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Bright red-emitting phosphors with high color purity and high photoluminescence quantum yield (PLQY) are highly demanded for the fabrication of high-performance warmwhite light-emitting diodes (LEDs). Herein, we demonstrated a novel efficient Eu 3+ -activated Ca 2 LaHf 2 Al 3 O 12 garnet phosphor with excellent luminescence properties for near-ultraviolet (near-UV) excited warm-white LEDs. The Ca 2 LaHf 2 Al 3 O 12 :Eu 3+ phosphors exhibited an intense excitation spectrum in the near-UV region with a maximum around 394 nm, and they produced dazzling red luminescence peaking at 592, 614, 659, and 711 nm due to the 5 D 0 → 7 F J (J = 1−4) transitions of Eu 3+ ions when the excitation wavelength was set at 394 nm. Luminescent properties have been studied as a function of Eu 3+ doping concentration, and the highest emission intensity was achieved at 50 mol % Eu 3+ , while the dipole−dipole interaction brought the concentration quenching effect. The Ca 2 LaHf 2 Al 3 O 12 :50%Eu 3+ sample exhibited CIE chromaticity coordinates of (0.6419, 0.3575) with a color purity of 92.7%, and its PLQY was measured to be 64%. The thermal stability and activation energy of Ca 2 LaHf 2 Al 3 O 12 :50%Eu 3+ phosphors were also discussed and analyzed. Finally, we made a near-UV chip-based white LED device in which the Ca 2 LaHf 2 Al 3 O 12 :50%Eu 3+ phosphor was utilized as a red ingredient. A bright warm-white light emission was realized from this LED device under 80 mA driving current, accompanied by a high color rendering index (CRI) of 88.3, a low correlation color temperature of 3853 K, and good CIE chromaticity coordinates of (0.3909, 0.3934). These results revealed that these red-emitting Ca 2 LaHf 2 Al 3 O 12 :Eu 3+ phosphors have promising application prospect in near-UV-excited warm-white LEDs with high a CRI.

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Section: Resultsmentioning

confidence: 97%

Dazzling Red-Emitting Europium(III) Ion-Doped Ca₂LaHf₂Al₃O₁₂ Garnet-Type Phosphor Materials with Potential Application in Solid-State White Lighting

Devakumar

et al. 2022

Inorg. Chem.

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“…YPO 4 powder used in the study was prepared via wet chemical route from yttrium acetate tetrahydrate (99% pure) and aqueous solution (85%) of ortho-phosphoric acid (Ref 6,8). The final spray-grade flowable powder was obtained from this through cold compaction, high-temperature (800 C) sintering followed by crushing and sieving.…”

Section: Methodsmentioning

confidence: 99%

Temperature Profile in YPO4 Laden Plasma Jet and Its Evolution with Arc Current and Powder Loading

et al. 2021

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YPO 4 is emerging as one of the fittest candidates for anti-corrosion thermal-barrier coatings suitable for aggressive environments at high temperature. The study presents an in situ investigation of the axial distribution of temperature in an YPO 4 laden plasma jet using a modified Boltzmann plot technique that does not require Abel inversion and suited for jets involving instabilities and thermal non-equilibrium. Investigated operating current range (528 to 730 A) and powder flow rates (5.37 to 13.62 g/min) are found to ensure effective development of YPO 4 coating. The nozzle exit temperature is found to vary from 11000 to 15000 K depending on arc current and powder loading. With no powder loading, the axial temperature distribution mostly follows a Gaussian-like profile at all set currents. With powder feeding, the profiles get transformed into nearly linear drop with local spiking of temperature at several axial locations. The tendency becomes more intense at higher arc current. Formation of shock trains in the jet with powder loading is suspected to be the underlying reason behind spatial spiking of temperature. Exhibited poor dependence of the nozzle exit temperature on powder loading at lower arc currents is found to get reversed at higher arc currents.

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“…The luminescent nanoparticles can be synthesized in many different ways. There are sol-gel synthesis [17,18], hydro-and solvothermal methods [4],…”

Section: Introductionmentioning

confidence: 99%

Micro and Nanocrystalline LuPO₄(Ln³⁺: Nd, Pr) - Morphology, Luminescence and Inter-ionic Interplays

Bezkrovna,

Zdeb,

Bezkrovnyi

et al. 2023

Acta Phys. Pol. A

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The effect of dopants (Nd 3+ , Pr 3+ ) introduced into micro and nanocrystals of LuPO4 on their structural, morphological, and luminescent properties has been examined. The tetragonal structure of the synthesized phosphates was confirmed by means of an X-ray diffraction study. Transmission electron microscopy of LuPO4 samples doped with 0-2% Pr 3+ and 0-3% Nd 3+ obtained by the microwave hydrothermal method showed the formation of the nanocrystalline samples with a size of 40-90 nm. Spectroscopic study of Lu1−x−yPrxNdyPO4 micro and nanocrystals showed that effective energy transfer occurs between the selected optically active ions. Due to significant ion-ion interactions in the co-doped orthophosphates, the contribution of nonradiative processes to the relaxation of the luminescent levels of praseodymium and neodymium effectively increases. The energy transfer in the micro and nanocrystals Lu1−x−yPrxNdyPO4 from Pr 3+ ions to Nd 3+ ions results in the efficient near-infrared emission in the region of the spectrum between 1064 and 1350 nm, whereas for Lu1−x−yPrxNdyPO4 nanocrystals doped with Pr 3+ and Nd 3+ ions, a particularly intense Nd 3+ luminescence appears at 1064 nm. There is a significant impact of concentration of the Pr 3+ and Nd 3+ ions on near-infrared luminescence intensity of the studied Lu1−x−yPrxNdyPO4 phosphates. The relaxation dynamic of the neodymium metastable excited state is substantially sensitive to a variety of praseodymium admixtures, and inversely, the experimental lifetime of 1 D2 Pr 3+ emission level gradually decreases with increasing Nd 3+ concentration.

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Preparation and characterization of luminescent YPO4: Eu3+ thin films using sol gel spin coating method

Cited by 9 publications

References 59 publications

Dazzling Red-Emitting Europium(III) Ion-Doped Ca₂LaHf₂Al₃O₁₂ Garnet-Type Phosphor Materials with Potential Application in Solid-State White Lighting

Dazzling Red-Emitting Europium(III) Ion-Doped Ca₂LaHf₂Al₃O₁₂ Garnet-Type Phosphor Materials with Potential Application in Solid-State White Lighting

Temperature Profile in YPO4 Laden Plasma Jet and Its Evolution with Arc Current and Powder Loading

Micro and Nanocrystalline LuPO₄(Ln³⁺: Nd, Pr) - Morphology, Luminescence and Inter-ionic Interplays

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Preparation and characterization of luminescent YPO4: Eu3+ thin films using sol gel spin coating method

Cited by 9 publications

References 59 publications

Dazzling Red-Emitting Europium(III) Ion-Doped Ca2LaHf2Al3O12 Garnet-Type Phosphor Materials with Potential Application in Solid-State White Lighting

Dazzling Red-Emitting Europium(III) Ion-Doped Ca2LaHf2Al3O12 Garnet-Type Phosphor Materials with Potential Application in Solid-State White Lighting

Temperature Profile in YPO4 Laden Plasma Jet and Its Evolution with Arc Current and Powder Loading

Micro and Nanocrystalline LuPO4(Ln3+: Nd, Pr) - Morphology, Luminescence and Inter-ionic Interplays

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Product

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Dazzling Red-Emitting Europium(III) Ion-Doped Ca₂LaHf₂Al₃O₁₂ Garnet-Type Phosphor Materials with Potential Application in Solid-State White Lighting

Dazzling Red-Emitting Europium(III) Ion-Doped Ca₂LaHf₂Al₃O₁₂ Garnet-Type Phosphor Materials with Potential Application in Solid-State White Lighting

Micro and Nanocrystalline LuPO₄(Ln³⁺: Nd, Pr) - Morphology, Luminescence and Inter-ionic Interplays