White light emitting magnesium aluminate nanophosphor: Near ultra violet excited photoluminescence, photometric characteristics and its UV photocatalytic activity

Pratapkumar, C.; Prashantha, S.C.; Nagabhushana, H.; Anilkumar, M.; Ravikumar, C.R.; Nagaswarupa, H.P.; Jnaneshwara, D.M.

doi:10.1016/j.jallcom.2017.09.058

Cited by 84 publications

(16 citation statements)

References 64 publications

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“…Dy 3+ doped NPs are generally studied due to their potential applications in white light emission as the emission band of Dy 3+ doped materials exhibit intense blue, yellow and red emission lines at around 480, 580 and 680 nm respectively corresponding to the transitions 4 F 9/2 → 6 H 15/2, 13/2 and 11/2 [5,6] and the same is observed in our previous studies in various host materials like LaAlO 3 :Dy 3+ [7], Zn 2 TiO 4 :Dy 3+ [8], MgAl 2 O 4 :Dy 3+ [9], Mg 2 SiO 4 :Dy 3+ [10], MgO:Dy 3+ [11] etc. Realization of white light is possible by adjusting the intensity ratio of yellow to blue (Y/B).…”

Section: Introductionsupporting

confidence: 86%

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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Section: Introductionsupporting

confidence: 86%

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

Sawant¹,

Prashantha²,

Naik³

et al. 2019

SN Appl. Sci.

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“…As the powder sample diffuses the light in large quantities with a greater thickness, the absorption spectra becomes more complicated to interpret. In order to minimize this difficulty, DRS along with Schuster–Kubelka–Munk (SKM) relation has been used [ 36 , 37 ] which can be given as

where R is the absolute reflectance of the sample and F(R) is the Kubelka–Munk function.…”

Section: Resultsmentioning

confidence: 99%

Optical and Electrochemical Applications of Li-Doped NiO Nanostructures Synthesized via Facile Microwave Technique

Bhatt

Ranjitha²,

Santosh³

et al. 2020

Materials

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Nanostructured NiO and Li-ion doped NiO have been synthesized via a facile microwave technique and simulated using the first principle method. The effects of microwaves on the morphology of the nanostructures have been studied by Field Emission Spectroscopy. X-ray diffraction studies confirm the nanosize of the particles and favoured orientations along the (111), (200) and (220) planes revealing the cubic structure. The optical band gap decreases from 3.3 eV (pure NiO) to 3.17 eV (NiO doped with 1% Li). Further, computational simulations have been performed to understand the optical behaviour of the synthesized nanoparticles. The optical properties of the doped materials exhibit violet, blue and green emissions, as evaluated using photoluminescence (PL) spectroscopy. In the presence of Li-ions, NiO nanoparticles exhibit enhanced electrical capacities and better cyclability. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) results show that with 1% Li as dopant, there is a marked improvement in the reversibility and the conductance value of NiO. The results are encouraging as the synthesized nanoparticles stand a better chance of being used as an active material for electrochromic, electro-optic and supercapacitor applications.

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“…Phosphors with properties such as long-standing, better brightness, quick response and good quantum efficiency are very much essential to reach the needs of the devices. Spectroscopic nature of sharp 4f-4f transitions of RE ions undoubtedly leads to ligand dependent luminescence sensitization, large stokes effect which is needed to convert UV or Near UV to visible light [1]. RE electronic transitions (4f-4f ) provide long lasting narrow emissions owing to the shielding effect of its 4f-shell electrons.…”

Section: Introductionmentioning

confidence: 99%

Effect of Bi3+ and Li+ co-doping on the luminescence properties of Zn2TiO4:Eu3+ nanophosphor for display applications

Girish

Prashantha²,

Naik³

et al. 2019

SN Appl. Sci.

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A novel Li + and Bi 3+ ions (0.5-2.0 mol%) co-doped Zn 2 TiO 4 :Eu 3+ (7 mol%) nanophosphors were synthesised by two step combustion route and its effect on luminescence characteristics are described. Addition of Li + and Bi 3+ ions does not introduce new luminescence characteristics but affects the intensity of Eu 3+ related emission. Crystalline structure were characterized by powder X-ray diffraction technique which confirms the formation of a cubic structure and the influence of synthesise conditions on surface morphology was examined by scanning electron microscopic technique. The photoluminescence (PL) properties of Li + and Bi 3+ ions (0.5-2.0 mol%) co-doped Zn 2 TiO 4 :Eu 3+ (7 mol%) show characteristic 4f-4f emissions of Eu 3+ ions at 578, 592, 613 and 654 nm, also reveals that the small quantity of co-dopant ions was highly effective for charge compensation as well as formation of lattice defects to boost the PL emission. Further, Commission International de I'E' clairge chromaticity and color purity results suggests that, the synthesised phosphor can be used as a red component for production of near ultraviolet based wLEDs, solid state lightning and display applications.

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White light emitting magnesium aluminate nanophosphor: Near ultra violet excited photoluminescence, photometric characteristics and its UV photocatalytic activity

Cited by 84 publications

References 64 publications

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

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

Optical and Electrochemical Applications of Li-Doped NiO Nanostructures Synthesized via Facile Microwave Technique

Effect of Bi3+ and Li+ co-doping on the luminescence properties of Zn2TiO4:Eu3+ nanophosphor for display applications

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