Photoluminescence and Judd–Ofelt analysis of Eu 3+ doped LaAlO 3 nanophosphors for WLEDs

Manohar, T.; Naik, Ramachandra; Prashantha, S.C.; Nagabhushana, H.; Sharma, S.C.; Nagaswarupa, H.P.; Anantharaju, K.S.; Pratapkumar, C.; Premkumar, H.B.

doi:10.1016/j.dyepig.2015.06.002

Cited by 66 publications

(12 citation statements)

References 47 publications

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“…As presented in Figure , most of the reported Eu 3+ -doped phosphors are located in the green rectangle, with the QE of 60%–85% and the remained fluorescent intensity of 70%–85% at 400 K compared with the initial intensity at room temperature (for details, see Table S5, Supporting Information). ,,,,,− In order to further improve the fluorescent performances, more research studies have been conducted, such as K 2 Tb(PO 4 )(WO 4 ):Eu 3+ with better thermal stability and Ca 3 Y 2 B 4 O 12 :Eu 3+ and Ca 4 LaO(BO 3 ) 3 :Eu 3+ with higher quantum efficiencies. ,, However, the enhancement in only one aspect cannot meet the requirements of practical applications. The LSBO:0.8Eu 3+ phosphor in this work with a higher QE and a more excellent thermal performance not only jumps out of the rectangle but also locates at a better position in Figure .…”

Section: Resultsmentioning

confidence: 99%

Delayed Concentration Quenching of Luminescence Caused by Eu³⁺-Induced Phase Transition in LaSc₃(BO₃)₄

Yang

Zhang

et al. 2020

Chem. Mater.

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Phase transitions induced by activator concentration should be avoided in most cases because they usually degrade luminescent properties of inorganic phosphors. However, in the LaSc 3 (BO 3 ) 4 :xEu 3+ (LSBO:xEu 3+ ) phosphors investigated here, a delayed concentration quenching of luminescence caused by Eu 3+ -induced phase transition from the monoclinic α-LSBO to the trigonal β-LSBO is proved via XRD refinements, photoluminescent spectra, fluorescence decay curves, and Raman spectra. Increasing the doping concentration of Eu 3+ within x lower than 0.8 benefits the transition from the αto β-phase, which increases the fluorescent lifetime and reduces the nonradiative transition of Eu 3+ , thus compensating the Eu 3+ luminescence and delaying the quenching point to a higher concentration. The inversion symmetry of the Eu 3+ site in β-LSBO is demonstrated to be higher than that in α-LSBO by the Judd−Ofelt theory and a new model proposed to calculate the distance index representing the symmetry. Moreover, both the high quantum efficiency of 89% and the good thermal stability of the emission intensity at 400 K being 88% of that at 300 K make the optimal LSBO:0.8Eu 3+ phosphor a promising application prospect. This kind of activator-induced phase transitions contributing to the enhanced luminescence and the delayed quenching concentration may provide a new and effective way for improving luminescent properties of phosphors.

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Section: Resultsmentioning

confidence: 99%

Delayed Concentration Quenching of Luminescence Caused by Eu³⁺-Induced Phase Transition in LaSc₃(BO₃)₄

Yang

Zhang

et al. 2020

Chem. Mater.

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“…Also, may be at higher concentrations, crossrelaxation process happens between Dy 3+ -Dy 3+ pairs [38], and this mechanism resulting from resonance energy transfer between neighbouring Dy 3+ ions. From energy match rule, the probable cross-relaxation channels (CRC1, CRC2 and CRC3) for Dy 3+ ions were responsible for depopulation of 4 Forster resonance energy transfer (FRET or FET) was established based on classical dipole-dipole interactions between the donor and the acceptor. However, in Dexter mechanism energy transfer was a short-range phenomenon (≤ 10 Å) that decreases with e −R and the critical distance (R c ) between donors (activators) and acceptors (quenching site) in the Bi 2 O 3 phosphor was found to be 17.38 Å as calculated by using Blasse, clearly show that the mechanism of exchange interaction was ineffective [40,41].…”

Section: Resultsmentioning

confidence: 99%

“…Use of those phosphor materials in light emitting diode (LEDs) was a major step in solid state lighting technology. However, white light emitting diodes (WLEDs) are considered to be the next generation lighting system because of their excellent properties like high luminous efficiency, low power consumption, environmentally friendly features (nontoxic), reliability and long life [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Bi2O3:Dy3+ nanophosphors: its white light emission and photocatalytic activity

Sawant¹,

Prashantha²,

Naik³

et al. 2019

SN Appl. Sci.

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The present work involves the synthesis, characterization, photoluminescence and photocatalytic studies of Dy 3+ (1-11 mol%) doped Bi 2 O 3 nanophosphors (NPs) by solution combustion method. The average crystallite size was determined using powder X-ray diffraction, found to be in the range of 15-30 nm. Scanning electron microscopy images shows that the synthesised product is porous and agglomerated. Kubelka-Munk function was used to assess the energy gap of Dy 3+ doped Bi 2 O 3 nanophosphors and it was found to be 2.53-3.00 eV. From the emission spectra, Judd-Ofelt parameters (Ω 2 and Ω 4 ), transition probabilities (A T ), quantum efficiency (η), luminescence lifetime (τ r ), color chromaticity coordinates (CIE) and correlated color temperature values were estimated and discussed in detail. The CIE chromaticity co-ordinates were close to the National Television Standard Committee standard value of white emission. Using Langmuir-Hinshelwood model, the photocatalytic activity results of Acid Red-88 showed, Bi 2 O 3 :Dy 3+ NPs were potential material for the development of efficient photocatalyst for environmental remediation. The obtained results prove that the Bi 2 O 3 :Dy 3+ NPs synthesised by this method can be potentially used for solid state display and photocatalyst.

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“…As a result, the phosphor can be used to fabricate WLEDs. [43] Figure 9 shows the photoluminescence (PL) spectra of the Mg 1-x Al 2 O 4 :xEu 3+ (x = 1-9 mol%) nanophosphors when excited at 394 nm. There are four bands associated with 5 D 0 !…”

Section: Photoluminescence Studiesmentioning

confidence: 99%

Low temperature‐synthesized MgAl₂O₄:Eu³⁺ nanophosphors and their structural validations using density functional theory: photoluminescence, photocatalytic, and electrochemical properties for multifunctional applications

Manjula¹,

Chandrasekhar²,

Naik³

et al. 2022

Luminescence

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A low temperature‐assisted and oxalyl dihydrazide fuel‐induced combustion synthesized series of uncalcined MgAl2O4:Eu3+ nanophosphors showed an average crystallite size of ~20 nm, and bandgap energy (Eg) of 4.50–5.15 eV, and were validated using density functional theory and found to match closely with the experimental values. The photoluminescence characteristic emission peaks of Eu3+ ions were recorded between 480 and 680 nm. The nanophosphors excited at 392 nm showed f–f transitions assigned as 5D0→7FJ (J = 0, 1, 2, and 3). The optimized MgAl2O4 phosphors had Commission Internationale de l'Eclairage coordinates in the red region, a correlated colour temperature of 2060 K, and a colour purity of 98.83%. The estimated luminescence quantum efficiency ( η) was observed to be ~63% using Judd–Ofelt analysis. Electrochemical and photocatalytic performance were explored and indicated its multifunctional applications. Therefore, MgAl2O4:Eu3+ nanophosphors could be used for the fabrication of light‐emitting diodes, industrial dye degradation, and as electrodes for supercapacitor applications.

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Photoluminescence and Judd–Ofelt analysis of Eu 3+ doped LaAlO 3 nanophosphors for WLEDs

Cited by 66 publications

References 47 publications

Delayed Concentration Quenching of Luminescence Caused by Eu³⁺-Induced Phase Transition in LaSc₃(BO₃)₄

Delayed Concentration Quenching of Luminescence Caused by Eu³⁺-Induced Phase Transition in LaSc₃(BO₃)₄

Bi2O3:Dy3+ nanophosphors: its white light emission and photocatalytic activity

Low temperature‐synthesized MgAl₂O₄:Eu³⁺ nanophosphors and their structural validations using density functional theory: photoluminescence, photocatalytic, and electrochemical properties for multifunctional applications

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Photoluminescence and Judd–Ofelt analysis of Eu 3+ doped LaAlO 3 nanophosphors for WLEDs

Cited by 66 publications

References 47 publications

Delayed Concentration Quenching of Luminescence Caused by Eu3+-Induced Phase Transition in LaSc3(BO3)4

Delayed Concentration Quenching of Luminescence Caused by Eu3+-Induced Phase Transition in LaSc3(BO3)4

Bi2O3:Dy3+ nanophosphors: its white light emission and photocatalytic activity

Low temperature‐synthesized MgAl2O4:Eu3+ nanophosphors and their structural validations using density functional theory: photoluminescence, photocatalytic, and electrochemical properties for multifunctional applications

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Delayed Concentration Quenching of Luminescence Caused by Eu³⁺-Induced Phase Transition in LaSc₃(BO₃)₄

Delayed Concentration Quenching of Luminescence Caused by Eu³⁺-Induced Phase Transition in LaSc₃(BO₃)₄

Low temperature‐synthesized MgAl₂O₄:Eu³⁺ nanophosphors and their structural validations using density functional theory: photoluminescence, photocatalytic, and electrochemical properties for multifunctional applications