Synthesis and optical studies of nanocrystalline Eu2+-doped and RE3+(Nd3+, Dy3+)-codoped Ba4Al14O25 materials for UV-LEDs

Kadyan, Sonika; Singh, Devender; Simantilleke, Anura Priyajith

doi:10.1016/j.ijleo.2020.164671

Cited by 22 publications

(8 citation statements)

References 42 publications

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“…Table 4 summarizes the atomic % along with weight % details of the considered nanophosphors. [37][38][39][40] In particular, a dominant band ( 6 H 15/2 ! 6 P 7/2 ) was observed at 351 nm.…”

Section: Edx Investigationmentioning

confidence: 99%

“…Figure 8 illustrates photoluminescence excitation (PLE) spectrum of the Dy 3+ -doped LaAlO 3 phosphor examined at a wavelength of 575 nm. The excitation spectrum exhibited numerous peaks at 302, 325, 351, 365, 388, 427, 453, and 476 nm accredited to transitions initiated from6 H 15/2 to the higher energy levels, 4 H 11/2 + 4 G 9/2 , 6 P 3/2 , 6 P 7/2 , 6 P 5/2 , 4 F 7/2 , 4 G 11/2 , 4 I 15/2 , and 4 F 9/2 respectively [37][38][39][40]. In…”

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confidence: 99%

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Luminous LaAlO₃:Dy³⁺ perovskite nanomaterials: Synthesis, structural, and luminescence characteristics for white light‐emitting diodes

et al. 2022

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A single‐phase perovskite LaAlO3:Dy3+ phosphor was synthesized using a gel‐combustion method at 600°C utilization with hexamethylenetetramine as a fuel. Further calcination of the samples was carried out (800 and 1000°C) to investigate the resultant effect on the crystalline and luminescence behaviour. The crystal structure had a cubic unit cell (space group Pm3̅m) and was examined using the Rietveld refinement and X‐ray diffraction data. Additionally, Debye–Scherrer and Williamson–Hall equations were applied to determine other structural features. The particle size and morphology of phosphors were evaluated using transmission electron microscopy. Diffraction measurements were supported by the various metal–oxygen vibration modes studied with the help of Fourier transform infrared spectroscopy. Energy‐dispersive X‐ray analysis verified the chemical composition of synthesized sample. Luminescence spectra of the LaAlO3:Dy3+ phosphors exhibited intense bands for 4F9/2→6H15/2 (482 nm, bluish region) and 4F9/2→6H13/2 (574 nm, yellowish region) transitions. Commission Internationale de L'Eclairage and correlated colour temperature data confirmed the cool‐white emission of the samples under ultraviolet light excitation. The interesting and advantageous luminescence characteristics of LaAlO3:Dy3+ phosphors make them potential materials for white light‐emitting diodes.

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“…Table 4 summarizes the atomic % along with weight % details of the considered nanophosphors. [37][38][39][40] In particular, a dominant band ( 6 H 15/2 ! 6 P 7/2 ) was observed at 351 nm.…”

Section: Edx Investigationmentioning

confidence: 99%

mentioning

confidence: 99%

Luminous LaAlO₃:Dy³⁺ perovskite nanomaterials: Synthesis, structural, and luminescence characteristics for white light‐emitting diodes

et al. 2022

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“…The characteristic luminescence of phosphors primarily depends on the types of host lattice, synthesis method, nature, and concentration of dopant ions. Several rare‐earth‐doped aluminates [3, 4], vanadates [5], oxides [6], phosphates [7, 8], and silicates [9] have been identified in the published literature. Three crystalline structures of silicates, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Figure 3 depicts the crystal structure and coordinative environment of the various ions residing in the Dy 3+ -doped Gd 2 Si 2 O 7 phosphors. The obtained crystallographic parameters of the doped sample were: a = 6.5356(4) Å, b = 6.7763(4) Å, c = 12.4521(2) Å, α = 93.895(2), β = 95.600(2), γ = 93.472(3), V = 546.313(13) Å 3 , Z = 4 and ρ = 5.86 g/cm3 . The results confirmed that the doped samples were structured into the triclinic phase with the P-1 space group.…”

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Structural, morphological, and optical characteristics of Gd₂Si₂O₇:Dy³⁺ nanophosphors for WLEDs

et al. 2023

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Yellowish‐white light‐emitting Gd2‐xSi2O7:xDy3+ (x = 1–5 mol%) nanophosphors were prepared using a solution combustion synthesis method. Fluorescence spectrophotometry and X‐ray diffraction measurements were performed to scrutinize the optical performances and phase recognition of the designated nanophosphors. The outcomes specified that the prepared phosphors were crystallized into a triclinic phase with a P‐1 space group. As the concentration of Dy3+ ions was increased, the unit‐cell volume decrease proportionally due to the replacement of large‐sized Gd3+ by small‐sized Dy3+ ions. Under ultraviolet excitation at 349 nm, emission spectra consisted of two pronounced emission lines at ~482 nm (blue line), ~578 nm (yellow line), and a relatively weaker emission at ~670 nm (red line) due to 4F9/2→6H15/2, 4F9/2→6H13/2, and 4F9/2→6H11/2 intraconfigurational transitions of Dy3+ ions, respectively. The evidence about the site symmetry around Dy3+ ions was examined by considering the ratio of yellow‐to‐blue emission intensity. The observed critical distance (Rc) value was ~20.56 Å (≫5 Å), which signified that energy transfer primarily occurred due to multipolar interaction. The obtained coordinates were close to the white region of the Commission Internationale de l'Éclairage chromaticity diagram, which marked a significant milestone in the development of white light‐emitting diodes.

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“…[ 21 ] The perovskite structure based nanosamples are fabricated via different synthetic routes, i.e. solid‐state reactions, [ 22 ] hydrothermal routes of synthesis, [ 23 ] aerosol furnace methods, [ 24 ] co‐precipitation methods, [ 25 ] gel‐combustion techniques, [ 26 ] sol–gel processes [ 27 ] and spray‐pyrolysis process. [ 28 ] In the current study, we have synthesized green light emitting Er 3+ ‐doped GdAlO 3 phosphor by urea assisted gel‐combustion process.…”

Section: Introductionmentioning

confidence: 99%

Emerging green light emission of Er³⁺‐activated single phased GdAlO₃ phosphors for lighting applications

et al. 2022

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An erbium ion (Er3+)‐activated gadolinium aluminate (GdAlO3) nanophosphor was synthesized by utilizing urea assisted gel‐combustion method. The crystal structure along with all other crystal parameters was determined by X‐ray diffraction (XRD) patterns. The selected samples are of orthorhombic phase with Pnma space group. The agglomerated particles within nanorange have been confirmed by transmission electron microscopy (TEM) micrographs. Elemental investigation was performed by energy dispersive X‐ray spectroscopy (EDX). Photoluminescence excitation (PLE) spectrum reveals a strong excitation band corresponding to the gadolinium ion (Gd3+) (276 nm) and a band near ultraviolet (UV) absorption for Er3+ (377 nm). Strong excitation band of Gd3+ was evident for the energy transfer between Gd3+ and Er3+ ions. All the doped sampled are excited at 377 nm wavelength. The photoluminescence (PL) spectrum exhibits an intense band at 546 nm (4S3/2 → 4I15/2) which is responsible for the green emission in the processed samples. The color coordinate values define their color in the green region and correlated color temperature (CCT) values affirm their utility as a cold light source.

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Synthesis and optical studies of nanocrystalline Eu2+-doped and RE3+(Nd3+, Dy3+)-codoped Ba4Al14O25 materials for UV-LEDs

Cited by 22 publications

References 42 publications

Luminous LaAlO₃:Dy³⁺ perovskite nanomaterials: Synthesis, structural, and luminescence characteristics for white light‐emitting diodes

Luminous LaAlO₃:Dy³⁺ perovskite nanomaterials: Synthesis, structural, and luminescence characteristics for white light‐emitting diodes

Structural, morphological, and optical characteristics of Gd₂Si₂O₇:Dy³⁺ nanophosphors for WLEDs

Emerging green light emission of Er³⁺‐activated single phased GdAlO₃ phosphors for lighting applications

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Synthesis and optical studies of nanocrystalline Eu2+-doped and RE3+(Nd3+, Dy3+)-codoped Ba4Al14O25 materials for UV-LEDs

Cited by 22 publications

References 42 publications

Luminous LaAlO3:Dy3+ perovskite nanomaterials: Synthesis, structural, and luminescence characteristics for white light‐emitting diodes

Luminous LaAlO3:Dy3+ perovskite nanomaterials: Synthesis, structural, and luminescence characteristics for white light‐emitting diodes

Structural, morphological, and optical characteristics of Gd2Si2O7:Dy3+ nanophosphors for WLEDs

Emerging green light emission of Er3+‐activated single phased GdAlO3 phosphors for lighting applications

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Product

Resources

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Luminous LaAlO₃:Dy³⁺ perovskite nanomaterials: Synthesis, structural, and luminescence characteristics for white light‐emitting diodes

Luminous LaAlO₃:Dy³⁺ perovskite nanomaterials: Synthesis, structural, and luminescence characteristics for white light‐emitting diodes

Structural, morphological, and optical characteristics of Gd₂Si₂O₇:Dy³⁺ nanophosphors for WLEDs

Emerging green light emission of Er³⁺‐activated single phased GdAlO₃ phosphors for lighting applications