Tunable light emission from single phased Ba2CaZn2Si6O17:Pb2+, Eu3+ silicate phosphors via energy transfer efficiency for white light emitting diode applications

Balakrishnan, Prabhuraj; Kennedy, S. Masilla Moses

doi:10.1016/j.solidstatesciences.2021.106665

Cited by 13 publications

(7 citation statements)

References 39 publications

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“…The calculated D r value for the SrZr 2 CaLa 2 O 8 :Eu 3+ phosphor was obtained to be 8.90%. Which is very much less than 30% [20], further supporting Eu 3+ occupancy at the La 3+ site. Moreover, the crystallite size of all studied compositions was computed with the Debye-Scherer formula, shown as, F I G U R E 3 Photoluminescence excitation (PLE) spectrum of SrZr 2 CaLa 2 O 8 :Eu 3+ (λ em = 627 nm) for 2.0 mol% of doping concentration.…”

Section: Characterizationmentioning

confidence: 81%

D_{hkl} goodbreak= \frac{K normalλ}{β \cos normalθ}

where K indicates a constant,

normalλ

signifies X‐ray wavelength,

β

represents full‐width at half‐maximum, and θ denotes angle of diffraction.…”

Section: Resultsmentioning

confidence: 99%

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Studies on a novel SrZr₂CaLa₂O₈:Eu³⁺ phosphor for lighting applications emitting direct white light

Aitha,

Dinakar,

Murthy

et al. 2023

Luminescence

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Direct white light emitting phosphors play a significant role in the display industry due to their ability to improve the quality, efficiency, and versatility of lighting sources used in most of the displays. The currently investigated phosphor SrZr2CaLa2O8:Eu3+ was prepared by a conventional solid‐state reaction method. It has been observed that the stoichiometric ratio of all precursors plays an important role in determining the characteristics of the final phosphor. From X‐ray diffraction (XRD) analysis, the phosphor was observed to have a hexagonal phase and a crystal size of ~28 nm. Scanning electron microscopy (SEM) observations revealed a cluster of rod‐like structures with an average diameter of ~0.2 μm. The excitation peak maximum observed at 280 nm is due to charge transfer between Eu3+‐O2− ions. The energy transitions 7F0 → 5L6 and 7F0 → 5D2 are responsible for the appearance of other excitation peaks at ultraviolet (UV) (395 nm), blue (~467 nm), green (~540 nm), orange (~590 nm), and red (~627 nm) attributed to 5D0 → 7FJ (J = 0–4) transitions of europium ion (Eu3+). The Commercial International de I'Eclairage (CIE) chromaticity coordinates were estimated to be (0.37, 0.0.33) and (0.67, 0.33) for the emissions corresponding to 395 and 590 nm, respectively. The characteristic emissions of Eu3+ ions allow this novel phosphor to be used to generate direct white light in light‐emitting diodes (LEDs), which is otherwise difficult to achieve in single‐component systems.

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Section: Characterizationmentioning

confidence: 81%

D_{hkl} goodbreak= \frac{K normalλ}{β \cos normalθ}

where K indicates a constant,

normalλ

signifies X‐ray wavelength,

β

represents full‐width at half‐maximum, and θ denotes angle of diffraction.…”

Section: Resultsmentioning

confidence: 99%

Studies on a novel SrZr₂CaLa₂O₈:Eu³⁺ phosphor for lighting applications emitting direct white light

Aitha,

Dinakar,

Murthy

et al. 2023

Luminescence

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“…As can be seen, the strong broad excitation band (for x = 0.01–0.09 mol) spanning from 220 to 400 nm might be attributed to the overlap of the transitions of (VO 4 ) 3− groups and form the charge transfer of O 2− to Eu 3+ (250 to 280 nm). In these systems, the Eu 3+ ions replace the Ca 2+ ions which are the dodecahedral sites of the garnet 37 . Along with the broad excitation band, a modest but distinct peak located at 394 nm (for λ emi = 610 nm, x = 0.01–0.09 mol) is due to the f–f transition ( 7 F 0 → 5 L 6 ) of the Eu 3+ ions 38 .…”

Section: Resultsmentioning

confidence: 99%

“…In these systems, the Eu 3+ ions replace the Ca 2+ ions which are the dodecahedral sites of the garnet. 37 Along with the broad excitation band, a modest but distinct peak located at 394 nm (for λ emi = 610 nm, x = 0.01-0.09 mol) is due to the f-f transition ( 7 F 0 → 5 L 6 ) of the Eu 3+ ions. 38 Due to the extremely high absorption coefficient value (10 3 -10 5 cm −1 ) of the (VO 4 ) 3− tetrahedral group, the V-O bond absorption intensity is substantially greater than the f-f transition peak.…”

Section: Photoluminescence Studiesmentioning

confidence: 93%

Structural characterization, energy transfer, and Judd–Ofelt analysis of pure and the Eu³⁺‐doped Ca₂LiMg₂V₃O₁₂ phosphors

Princy,

Annie Rathnakumari,

Masilla Moses Kennedy

2023

J Am Ceram Soc.

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A novel vanadate host Ca 2 LiMg 2 V 3 O 12 (CLMV) and the Eu 3+ -doped samples were synthesized via a solid-state reaction method. The phase formation and the morphological analysis were studied in detail. The Rietveld refinement result shows that the host belongs to cubic space group Ia-3d (230) with lattice parameter, a = 12.3948 Å, V = 1904.23 Å 3 , and Z = 8. The diffuse reflectance spectroscopy measurement estimated the bandgap of the host and the CLMV:0.05Eu 3+ phosphors. The host exhibits a broad absorption band (peak at 345 nm) ranging from 240 to 380 nm, which is attributed to the charge transfer in the O 2− -V 5+ complex. Under near UV excitation (λ exc = 345 nm), the host gives a broad emission band covering the visible region from 400 to 730 nm and the emission is in the bluish-green region of the CIE diagram. When the host is doped with the Eu 3+ ions and excited at 345 nm, the emission spectrum depicts the superimposition of the characteristic emission bands (red emission) of the Eu 3+ ions corresponding to the f-f transitions over the broad emission band of the host. The calculated color coordinates (9600 to 2280 K) demonstrated the color tuning ability of the phosphor as the dopant concentration is increased in the host. This is because the VO 4 3− group plays the sensitiser role and partially transfers energy with the Eu 3+ ions. When the same set of phosphors were excited at the dominant characteristic excitation band (λ exc = 394 nm) of the Eu 3+ , the characteristic emission bands of the Eu 3+ in the orange-red region were observed. As the electric dipole transition of the Eu 3+ was found to be dominant, the prepared phosphors possessed high color purity (CP). The energy transfer mechanism and the lifetime values were also presented. The temperature-dependent PL studies showed good thermal stability of the optimum sample. Various radiative transition properties were analyzed by the Judd-Ofelt theory. The photometric results reveal the color tuning ability and CP of the CLMV:xEu 3+ phosphors.

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“…However, these phosphors have weak Commission Internationale de l'éclairage (CIE) coordinates, resulting in a low colour rendering index (CRI) and the lack of a red component [5].…”

Section: Introductionmentioning

confidence: 99%

Emission enhancement in the luminescence performance of warm red light‐emitting LiSrVO₄:Pr³⁺ phosphors

Mala,

Albert,

Princy

et al. 2024

Luminescence

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Warm red‐emitting praseodymium‐doped LiSrVO4 phosphors were synthesized via solid‐state reaction. The phase formation was verified using an X‐ray diffraction study and the morphology was investigated using a scanning electron microscope study. The LiSrVO4:Pr3+ phosphors emitted red light when exposed to ultraviolet light, indicating their possibility for use in warm white light‐emitting diodes (WLEDs). Furthermore, the effect of charge compensators on the luminescence characteristics was addressed. The decay time was investigated using time‐resolved photoluminescence. Furthermore, thermal quenching was analyzed through temperature‐dependent photoluminescence spectra. Their sensitivity was calculated using temperature‐dependent decay time analysis. The colour purity of the emitted light could be measured by photometric analysis. This comprehensive investigation provides a thorough understanding of the luminescence properties of phosphors for WLED applications.

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Tunable light emission from single phased Ba2CaZn2Si6O17:Pb2+, Eu3+ silicate phosphors via energy transfer efficiency for white light emitting diode applications

Cited by 13 publications

References 39 publications

Studies on a novel SrZr₂CaLa₂O₈:Eu³⁺ phosphor for lighting applications emitting direct white light

Studies on a novel SrZr₂CaLa₂O₈:Eu³⁺ phosphor for lighting applications emitting direct white light

Structural characterization, energy transfer, and Judd–Ofelt analysis of pure and the Eu³⁺‐doped Ca₂LiMg₂V₃O₁₂ phosphors

Emission enhancement in the luminescence performance of warm red light‐emitting LiSrVO₄:Pr³⁺ phosphors

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Tunable light emission from single phased Ba2CaZn2Si6O17:Pb2+, Eu3+ silicate phosphors via energy transfer efficiency for white light emitting diode applications

Cited by 13 publications

References 39 publications

Studies on a novel SrZr2CaLa2O8:Eu3+ phosphor for lighting applications emitting direct white light

Studies on a novel SrZr2CaLa2O8:Eu3+ phosphor for lighting applications emitting direct white light

Structural characterization, energy transfer, and Judd–Ofelt analysis of pure and the Eu3+‐doped Ca2LiMg2V3O12 phosphors

Emission enhancement in the luminescence performance of warm red light‐emitting LiSrVO4:Pr3+ phosphors

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Studies on a novel SrZr₂CaLa₂O₈:Eu³⁺ phosphor for lighting applications emitting direct white light

Studies on a novel SrZr₂CaLa₂O₈:Eu³⁺ phosphor for lighting applications emitting direct white light

Structural characterization, energy transfer, and Judd–Ofelt analysis of pure and the Eu³⁺‐doped Ca₂LiMg₂V₃O₁₂ phosphors

Emission enhancement in the luminescence performance of warm red light‐emitting LiSrVO₄:Pr³⁺ phosphors