Judd-Ofelt and structural analysis of colour tunable BaY 2 ZnO 5 :Eu 3+ nanocrystals for single-phased white LEDs

Dalal, Mandeep; Taxak, V.B.; Chahar, Sangeeta; Dalal, Jyoti; Khatkar, Avni; Khatkar, S.P.

doi:10.1016/j.jallcom.2016.06.040

Cited by 58 publications

(20 citation statements)

References 45 publications

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“…In the earlier literature, the color coordinates reported for Eu 3 + ‐doped Y 2 BaZnO 5 were (0.64, 0.36) and for Tb 3 + ‐doped Y 2 BaZnO 5 were (0.35, 0.55) . The slight variation in coordinates between earlier reported phosphor and that reported here may be due to variations in the doping concentration …”

Section: Resultscontrasting

confidence: 39%

Synthesis and luminescence characterization of Y₂BaZnO₅:RE (RE = Eu³⁺, Tb³⁺, Pr³⁺ and Sm³⁺) phosphors

Taikar¹,

Joshi²,

Moharil

2016

Luminescence

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Modified synthesis and luminescence of Y BaZnO phosphors activated with the rare earths (RE) Eu , Tb , Pr and Sm are reported. RE BaZnO phosphors have attracted attention because of their interesting magnetic and optical properties; and are usually prepared using a two-step solid-state reaction. In the first step, carbonates or similar precursors are thoroughly mixed and heated at 900°C to decompose them to oxides. To eliminate the unwanted phases like BaRE O , the resulting powders are reheated at 1100°C for a long time. We prepared Y BaZnO phosphors activated with various activators by replacing the first step with combustion synthesis. The photoluminescence results are presented. The photoluminescence results for Eu , Tb and Pr are in good agreement with the literature. However, photoluminescence emission from Sm has not been documented previously. The excitation spectrum of Eu is dominated by a charge transfer band around 261 nm, and an additional band around 238 nm is always present, irrespective of the type of activator. The presence of this band for all these different types of activators was interpreted as host absorption.

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Section: Resultscontrasting

confidence: 39%

Synthesis and luminescence characterization of Y₂BaZnO₅:RE (RE = Eu³⁺, Tb³⁺, Pr³⁺ and Sm³⁺) phosphors

Taikar¹,

Joshi²,

Moharil

2016

Luminescence

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“…Additionally, the relative quantum yield of complexes can be ascertained relative to YAG: Ce 3+ phosphor as a standard (ϕ = 0.55) using the following equation [44,45]:…”

Section: Decay Time and Quantum Yieldmentioning

confidence: 99%

Augmentation of photophysical features and Judd–Ofelt analysis of extensively green glowing terbium (III) complexes with nitrogen donor ancillary ligands

Hooda

Taxak

Malik

et al. 2022

Photochem Photobiol Sci

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Six green glowing terbium (III) complexes were fabricated via grinding method utilizing a prime organic ligand (L) and nitrogen donor ancillary ligands. Characterization of synthesized complexes was accomplished through various spectroscopic techniques. The significant thermal stability was determined by thermogravimetric analysis while the energy bandgap and Urbach energy were investigated through diffused reflectance spectra of these complexes. The peak observed at 548 nm in emission spectra is responsible for the virescent color of these complexes. Color purity, decay time, quantum yield, and emission intensities of ternary complexes were significantly improved as compared to binary ones due to the synergistic effect of ancillary ligands. Judd-Ofelt parameters were determined by the NIR absorption spectrum, which claims the asymmetric environment around the terbium (III) ion. CCT values advocate the applicability of these complexes in green light-emitting materials as a cool light source. The biological assignments reveal the significance of these complexes as potent antioxidants and antimicrobial agents. The energy transfer process highlights the enhancement of luminescence in these complexes via the synergic effect of ligands. Our investigation portrays that these complexes can be employed in laser technology, display devices, semiconductors, biological fields, and optoelectronic devices.

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“…292 nm, which is consistent with those previous reports. 36,37 The emissions occurring at ∼590, 613, and 701 nm are due to the electronic transitions from 5 D 0 to 7 F 1, 2, 4 , respectively (see Figure 5d). 34 The emission of 5 D 0 → 7 F 2 is dominant, which is followed by 5 D 0 → 7 F 4 and 5 D 0 → 7 F 1 .…”

Section: T H I S C O N T E N T Imentioning

confidence: 99%

Photoconversion Mechanisms and the Origin of Second-Harmonic Generation in Metal Iodates with Wide Transparency, NaLn(IO₃)₄ (Ln = La, Ce, Sm, and Eu) and NaLa(IO₃)₄:Ln³⁺ (Ln = Sm and Eu)

Kim

et al. 2017

Inorg. Chem.

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Four new metal iodates, namely, NaLn(IO) (Ln = La, Ce, Sm, and Eu), and a series of NaLa(IO):Ln (Ln = Sm and Eu) solid solutions were synthesized through hydrothermal reactions. The structures of the title compounds are similar to that of NaY(IO) crystallizing in the acentric monoclinic space group Cc. The iodate materials reveal layered structures composed of LnO square antiprisms and IO polyhedra, in which each layer is connected by the I···O interactions. NaLa(IO) suggests a great potential as a matrix for optical source attributed to its acentricity and broad transparency from visible to mid-IR region. The photoluminescence properties depending on the concentration of Sm reveal that NaLa(IO):Sm undergoes a self-quenching relaxation over 7 mol % of Sm by dipole-quadrupole interactions. Attributable to the asymmetric coordination environment of Ln, stronger electric dipole transitions compared to magnetic dipole transitions were observed for both compounds. In addition, the materials exhibit strong second-harmonic generation (SHG) responses and are type I phase-matchable. The structural origin of the SHG properties for the reported iodates is elucidated.

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Judd-Ofelt and structural analysis of colour tunable BaY 2 ZnO 5 :Eu 3+ nanocrystals for single-phased white LEDs

Cited by 58 publications

References 45 publications

Synthesis and luminescence characterization of Y₂BaZnO₅:RE (RE = Eu³⁺, Tb³⁺, Pr³⁺ and Sm³⁺) phosphors

Synthesis and luminescence characterization of Y₂BaZnO₅:RE (RE = Eu³⁺, Tb³⁺, Pr³⁺ and Sm³⁺) phosphors

Augmentation of photophysical features and Judd–Ofelt analysis of extensively green glowing terbium (III) complexes with nitrogen donor ancillary ligands

Photoconversion Mechanisms and the Origin of Second-Harmonic Generation in Metal Iodates with Wide Transparency, NaLn(IO₃)₄ (Ln = La, Ce, Sm, and Eu) and NaLa(IO₃)₄:Ln³⁺ (Ln = Sm and Eu)

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Judd-Ofelt and structural analysis of colour tunable BaY 2 ZnO 5 :Eu 3+ nanocrystals for single-phased white LEDs

Cited by 58 publications

References 45 publications

Synthesis and luminescence characterization of Y2BaZnO5:RE (RE = Eu3+, Tb3+, Pr3+ and Sm3+) phosphors

Synthesis and luminescence characterization of Y2BaZnO5:RE (RE = Eu3+, Tb3+, Pr3+ and Sm3+) phosphors

Augmentation of photophysical features and Judd–Ofelt analysis of extensively green glowing terbium (III) complexes with nitrogen donor ancillary ligands

Photoconversion Mechanisms and the Origin of Second-Harmonic Generation in Metal Iodates with Wide Transparency, NaLn(IO3)4 (Ln = La, Ce, Sm, and Eu) and NaLa(IO3)4:Ln3+ (Ln = Sm and Eu)

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Synthesis and luminescence characterization of Y₂BaZnO₅:RE (RE = Eu³⁺, Tb³⁺, Pr³⁺ and Sm³⁺) phosphors

Synthesis and luminescence characterization of Y₂BaZnO₅:RE (RE = Eu³⁺, Tb³⁺, Pr³⁺ and Sm³⁺) phosphors

Photoconversion Mechanisms and the Origin of Second-Harmonic Generation in Metal Iodates with Wide Transparency, NaLn(IO₃)₄ (Ln = La, Ce, Sm, and Eu) and NaLa(IO₃)₄:Ln³⁺ (Ln = Sm and Eu)