Optical properties of Er3+–Ag co-doped ZnO nanocrystals prepared by combustions method

Yang, Jinmei; Zhang, Haiming; Wang, Xu; Qin, Feifei; Wang, Caixia

doi:10.1007/s10854-014-2104-y

Cited by 4 publications

(3 citation statements)

References 28 publications

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“…The UC is a two photon process, and a minor red emission due to 5 F 5 → 5 I 8 transition is attributed to low nonradiative relaxation probability from 5 S 2 , 5 F 4 level to lower 5 F 5 level. Such a two photon UC process in ZnO:Ho 3+ (slope 1.6) has also been reported. , …”

Section: Up Conversion In Znomentioning

confidence: 53%

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Rare Earth Doped Zinc Oxide Nanophosphor Powder: A Future Material for Solid State Lighting and Solar Cells

et al. 2017

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A comprehensive review of up-conversion (UP) and down-conversion (DC) or down shifting of rare earth (RE) doped zinc oxide (ZnO) nanophosphors is presented. Research interest in the development of RE 3+ doped ZnO for UP and DC nanophosphors has been encouraged by the potential application of these materials in light emitting diodes and different types of photovoltaic cells. A range of remarkable characteristics, which are organized into different sections describing the structure, optical, and luminescence properties of these materials, are discussed in detail. Undoped ZnO has two characteristic emissions in the ultraviolet and visible regions related, respectively, to excitonic recombination and intrinsic defects. X-ray photoelectron spectroscopy (XPS) data demonstrated a correlation between the visible emission and intrinsic defects. In the case of the DC or shifting process, there was simultaneous emissions related to f → f transitions of RE ions and defects in ZnO host. These emissions were dependent on the synthesis method, annealing temperature, and RE ion concentration, among other things; only f → f transitions of RE ions were observed in the case of the UC process. These down and up conversion RE doped ZnO phosphors were evaluated for a possible application in solid state lighting and photovoltaic cells.

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Section: Up Conversion In Znomentioning

confidence: 53%

“…Such a two photon UC process in ZnO:Ho 3+ (slope 1.6) has also been reported. 191,192 Nd, Yb, and Tm Doped ZnO. A combination of other RE ions such as Nd, Yb, and Tm also exhibits UC luminescence.…”

Section: ■ Up Conversion In Znomentioning

confidence: 99%

Rare Earth Doped Zinc Oxide Nanophosphor Powder: A Future Material for Solid State Lighting and Solar Cells

et al. 2017

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“…The surface plasmon resonance of silver NPs as well as the energy transfer from silver NPs to Er 3? ions appreciably influenced the UC luminescence intensity in the visible regions of the codoped ZnO nanoparticles [24]. In our earlier work [25], dual mode luminescence has been reported in ZnO doped with RE ion emitters Er 3?…”

Section: Introductionmentioning

confidence: 83%

Dual mode luminescence in rare earth (Er3+/Ho3+) doped ZnO nanoparticles fabricated by inclusive co precipitation technique

Das

Khichar

Chawla

2015

J Mater Sci: Mater Electron

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Dual excitation properties have been introduced in ZnO nanoparticles (*10 nm) through lanthanide (Er 3? /Ho 3? ) doping by inclusive co precipitation at room temperature. Monophasic hexagonal ZnO nanoparticles form hierarchical micro flowers as a consequence of lanthanide doping. The Stokes and anti Stokes emissions were investigated under UV (399 nm) and IR (980 nm) excitation. The down-conversion emission under band edge excitation is in the blue region and the up-conversion (UC) emission of lanthanide doped ZnO nanocrystals exhibit strong green and red fluorescence bands for ZnO:Er 3? and only green band for ZnO:Ho 3? . Post synthesis annealing further improves luminescence properties in ZnO:Er 3? that exhibits triple mode excitation of fluorescence under UV as well as IR wavelengths 980 and 1550 nm, also confirmed by confocal fluorescence mapping. The measured dependence of pump power on UC emission suggest that lanthanide doping in ZnO leads to frequency up-conversion emission via two to three photon absorption processes.

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Excitation induced enhancement of spectral response and energy transfer mechanisms in Fe/Sm modified ZnO phosphors

Kaur

Kriti

et al. 2020

Journal of Applied Physics

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The present study aims to analyze the tunability of photonic emissions as a function of excitation wavelengths in Fe/Sm co-doped ZnO phosphors. We have investigated the up-conversion (UC) and down-conversion (DC) luminescences in detail along with possible channels for energy transfer and their local electronic structures. These phosphors are polycrystalline with a hexagonal wurtzite structure, and the co-doping of Fe/Sm ions leads the 3D-pyramid like morphology of the ZnO to transform in flower-shaped nanorods. Further, from the UV–Vis spectra, it is found that bandgap contracts due to the formation of defects. The DC emission spectra (λex = 325 nm) show an enhancement of polychromatic emission as a function of the Sm concentration and tune from orange to red along with the transition from the warm to cool region in the Commission International de l'Eclairage 1931 XY spectral chromaticity coordinates. X-ray absorption spectra confirm the presence of Fe2+/Fe3+ ions and Sm3+ ions. Using the decay kinetics and transfer efficiencies, the energy transfer between the host defect levels and dopant ions is explained with the help of the energy level diagram. The UC emission spectra (λex = 980 nm) exhibit monochromatic red emission along with a strong near-infrared emission lying in the cool region with 100% color purity. These phosphors are expected to find applications in solid-state lighting applications, optoelectronics, and biomedical engineering, etc.

show abstract

Optical properties of Er3+–Ag co-doped ZnO nanocrystals prepared by combustions method

Cited by 4 publications

References 28 publications

Rare Earth Doped Zinc Oxide Nanophosphor Powder: A Future Material for Solid State Lighting and Solar Cells

Rare Earth Doped Zinc Oxide Nanophosphor Powder: A Future Material for Solid State Lighting and Solar Cells

Dual mode luminescence in rare earth (Er3+/Ho3+) doped ZnO nanoparticles fabricated by inclusive co precipitation technique

Excitation induced enhancement of spectral response and energy transfer mechanisms in Fe/Sm modified ZnO phosphors

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