Tunable and white emission from ZnO:Tb3+ nanophosphors for solid state lighting applications

Kumar, Vinod; Som, Sudipta; Kumar, V. Senthil; Kumar, Vinay; Ntwaeaborwa, O.M.; Coetsee, E.; Swart, H.C.

doi:10.1016/j.cej.2014.06.027

Cited by 161 publications

(89 citation statements)

References 53 publications

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“…This is assigned to the intrinsic band gap absorption. These peaks are due to the electronic transition occurring between the valence band and the conduction band [29].…”

Section: Optical Absorption Studiesmentioning

confidence: 97%

Structural, optical and antibacterial activity studies of neodymium doped ZnO nanoparticles

Vijayaprasath

Murugan

Palanisamy

et al. 2015

J Mater Sci: Mater Electron

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Trivalent neodymium doped ZnO (Zn 1-x Nd x O, x = 0.0, 0.03, 0.06 and 0.09) nanoparticles (NPs) synthesized by co-precipitation method with improved optical and antibacterial performance is reported. X-ray diffraction pattern indicates most of Nd 3? ions are incorporated in Zn 2? ions of ZnO lattice and hence there is no secondary peak of NdO 3 in synthesized ZnO NPs. Fourier transform infrared spectroscopy analysis of synthesized NPs exhibits similar patterns in Zn/Nd-O bands observed at 480 cm -1 . High resolution scanning electron microscopy images revealed the formation of spindle like morphology and the incorporation of Nd ions is confirmed by energy dispersive spectra analysis. UV-visible absorption spectra of pure and Nd doped ZnO NPs showed the variation of the band gap in the range of 3.06-2.65 eV. Raman analysis confirmed the formation of wurtzite structure of NPs was distorted due to Nd substitution in ZnO matrix. X-ray photoelectron spectroscopy confirmed the Nd incorporation in the ZnO lattice as Nd 3? . The prepared Nd doped ZnO NPs showed potential application in antibacterial activities.

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“…This is assigned to the intrinsic band gap absorption. These peaks are due to the electronic transition occurring between the valence band and the conduction band [29].…”

Section: Optical Absorption Studiesmentioning

confidence: 97%

Structural, optical and antibacterial activity studies of neodymium doped ZnO nanoparticles

Vijayaprasath

Murugan

Palanisamy

et al. 2015

J Mater Sci: Mater Electron

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“…To our knowledge, the refractive index value of LiNa 3 P 2 O 7 host matrix is not reported in the literature. However, by considering the quite similar crystal structure between LiNa 3 P 2 O 7 and Li 2-BaP 2 O 7 , and compared to the calculated results of different phosphate crystals, the refractive index value generally ranges from 1.4 to 1.8 [36]. Therefore, in the present investigation, the authors considered the refractive index value of 1.8 for the prepared phosphor to calculate the J-O parameters.…”

Section: Judd-ofelt Parametersmentioning

confidence: 94%

Synthesis, photoluminescence and Judd–Ofelt parameters of LiNa3P2O7:Eu3+ orthorhombic microstructures

et al. 2015

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We report, for the first time, the photoluminescence properties of Eu 3? -doped LiNa 3 P 2 O 7 phosphor, synthesized by a facile solid-state reaction method in air atmosphere. The crystal structure and phase purity of the phosphors were analyzed by X-ray diffraction analysis. Orthorhombic structural morphology was identified by scanning electron microscopy. The phosphate groups in the phosphor were confirmed by Fourier transform infrared analysis. Bandgap of the phosphor was calculated from the diffuse reflectance spectra data using Kubelka-Munk function. Under 395-nm UV excitation, the phosphors show signs of emitting red color due to the 5 D 0 ? 7 F 2 transition. In accordance with Judd-Ofelt theory, spectroscopic parameters such as oscillator intensity parameter X t (t = 2), spontaneous emission probabilities, fluorescence branching ratios and radiative lifetimes were calculated and analyzed for the first time in this system.

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“…Many researchers have recently been attracted to research white phosphors for applications in solid-state lighting with the goal to replace fluorescent lamps by creating sources with improved lifetime, efficiency and reliability [1][2][3][4]. Phosphor-converted white light-emitting diodes (pcW-LEDs) generate white light using phosphors together with a short-wavelength excitation source in the visible and/or ultraviolet spectral regime and now play an important role in modern lighting due to their high efficiency, relatively low cost, compact structure and simple driving circuitry [5,6].…”

Section: Introductionmentioning

confidence: 99%

White luminescence from sol–gel silica doped with silver

Abbass

Swart

Kroon

2015

J Sol-Gel Sci Technol

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Undoped silica and Ag-doped silica (SiO 2 ) were synthesized by the sol-gel method. The photoluminescence properties as a function of annealing temperature were investigated in detail. The addition of Ag introduced new optical active centres in the sample annealed at 1000°C, responsible for emission bands at 2.25 eV (550 nm) and 3.26 eV (380 nm) in the SiO 2 luminescence spectrum. These new emission bands were related to excess oxygen due to decomposition of Ag 2 O at high temperatures. The additional luminescence band at 2.25 eV changed the blue emission from pure SiO 2 to near white light from Ag-doped SiO 2 , suggesting that the SiO 2 :Ag system may be suitable for solidstate lighting applications. The stability of this phosphor under ultraviolet irradiation was investigated. Graphical Abstract

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Tunable and white emission from ZnO:Tb3+ nanophosphors for solid state lighting applications

Cited by 161 publications

References 53 publications

Structural, optical and antibacterial activity studies of neodymium doped ZnO nanoparticles

Structural, optical and antibacterial activity studies of neodymium doped ZnO nanoparticles

Synthesis, photoluminescence and Judd–Ofelt parameters of LiNa3P2O7:Eu3+ orthorhombic microstructures

White luminescence from sol–gel silica doped with silver

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