Influence of local structure on luminescence dynamics of red emitting ZnO:Eu3+ nanostructures and its Judd-Ofelt analysis

Raji, R.; Kumar, Ramesh; Gopchandran, K.G.

doi:10.1016/j.jlumin.2018.09.002

Cited by 40 publications

(16 citation statements)

References 55 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Comparable performance concerning micro-strain was also reported by K.G. Gopchandran et al [16] upon Eu-doping with ZnO nanophosphor. This variation in the micro-strain indicates the substitution of Eu 3+ ions into ZnO lattice.…”

Section: Characterizationsupporting

confidence: 66%

“…In comparison to 3d metal and non-metallic doping transitions, ZnO semiconductors with RE doped ions have been of great concern due to their f → f or f → d internal orbital transitions, which give highly intensive ultraviolet (UV) emissions, as well as visible and infrared areas [13,14]. Moreover, the optical properties of RE ions depend mainly on the local environment or host material symmetry [15,16]. Despite its precious technological interests, many studies on RE doped semiconductors have been conducted.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Bright red luminescence emission of macroporous honeycomb-like Eu3+ ion-doped ZnO nanoparticles developed by gel-combustion technique

Naik

Viswanath

et al. 2020

SN Appl. Sci.

View full text Add to dashboard Cite

The impact of europium (Eu 3+) ion doping has been outlined in improving the structure and optical properties of macroporous honeycomb-like zinc oxide (ZnO) nanoparticles, produced by the gel-combustion technique by changing the quantity of dopant. The X-ray diffraction (XRD) research verified that the hexagonal wurtzite structure of ZnO was not disturbed by Eu 3+ substitution. Scherrer method, Scherrer plots (SP), Williamson-Hall (W-H) plots and Size-Strain plots (SSP) were used to estimate the crystallite size. Decreased crystallite size in ZnO:Eu 3+ was noticed along with lower angle shift of XRD peaks and increased lattice parameters such as unit cell volume that can be described as replacement result of Eu 3+ at Zn sites. Fourier transform infrared (FTIR) spectroscopy analysis confirmed the Eu 3+ dopant by moving the peak from 474 cm −1 to 525 cm −1. Field-emission scanning electron microscopy (FESEM) pictures verified macroporous honeycomb-like structures. UV-Visible (UV-Vis) absorption spectroscopic studies show that the ability of ZnO:Eu 3+ nanoparticles concerning the absorption of visible light increased upon Eu 3+ doping with a red shift compared to ZnO nanoparticles. Photoluminescence (PL) emission spectra of Eu 3+ doped ZnO nanoparticles exhibited five intense band emissions at 579, 591, 617, 652, and 706 nm ascribed to 5

show abstract

Section: Characterizationsupporting

confidence: 66%

Section: Introductionmentioning

confidence: 99%

Bright red luminescence emission of macroporous honeycomb-like Eu3+ ion-doped ZnO nanoparticles developed by gel-combustion technique

Naik

Viswanath

et al. 2020

SN Appl. Sci.

View full text Add to dashboard Cite

show abstract

“…Peterson and group reported the Eu-doped ZnO film deposition on silicon substrate using sol-gel process, though the films deposited do not possess a good structural quality, with the accumulation of europium at the film surface. Raji et al synthesized the ZnO-Eu 3+ nanostructure powder using coprecipitation method [30]. They reported that Eu 3+ incorporation changed the morphology of the nanostructure from rod to flower.…”

Section: Introductionmentioning

confidence: 99%

Cost-effective ZnO–Eu3+ films with efficient energy transfer between host and dopant

et al. 2020

View full text Add to dashboard Cite

The present work focuses on the deposition of Europium (Eu 3+ ) incorporated zinc oxide (ZnO) film by a cost effective chemical solution deposition method. ZnO film with varying concentration of Eu 3+ ions (2, 3 and 4 atomic percent) were deposited and characterized using different techniques like X-ray diffractogram (XRD), scanning electron microscopy. XRD studies revealed that highly c-axis oriented ZnO films without showing any segregation of europium oxide were obtained at 650 °C. The optical properties were determined using UV-visible spectrophotometry and photoluminescence measurements. UB-visible spectroscopy revealed that Eu 3+ doping shifted optical band gap with increase in transparency of the films. The Eu 3+ doped film showed intense emission at 614 nm which was attributed to the defect emission from ZnO that gets trapped by Eu 3+ ions ultimately leading to 7 F 2 to 5 D 0 transition in Eu 3+ .

show abstract

“…From the absorption or luminescence spectra, Judd-Ofelt (JO) theory has the ability to predict the oscillator strengths, estimates of quantum efficiencies and excited state radiative lifetimes in terms of intensity parameters Ω t (t = 2, 4, 6). [17][18][19] Typically, the Ω 2 parameter is associated with short-range coordination effects. The higher polarization and asymmetry of the Ln III -b-diketones, the larger Ω 2 value is expected.…”

Section: Introductionmentioning

confidence: 99%

“…JO theory has become crucial to evaluating the performance of the luminescent materials in terms of symmetry around Eu III ion. [19][20][21] Tris-and tetrakis-b-diketonate Ln III complexes have been widely used as the emitting layer in organic lightemitting diodes (OLEDs) due to the high intensity and monochromatic emission. 22 The last one is known to be promising, due to their higher thermal and chemical stabilities, luminescence lifetimes, the cross-section of photon absorption and charge carrier trapping and luminescence quantum yields than the widely studied triscomplexes.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Different Ammonium Cations on the Optical Properties of Tetrakis GdIII and EuIII Complexes

Adati¹,

Monteiro²,

Cardoso³

et al. 2019

J. Braz. Chem. Soc.

View full text Add to dashboard Cite

A series of tetrakis-b-diketonate Q + [Ln(b-dik) 4 ]-, where Ln = Gd III or Eu III , Q = ammonium cations and b-dik = tta (2-thenoyltrifluoracetone) or bmdm (1-(4-tert-butylphenyl)-3-(4-methoxyphenyl)-1,3-propanedione) have been synthesized and characterized. The environment surrounding the Eu III ion depends on the lateral groups of the ligand and on the alkyl chains of the counter ion Q. The shortest lifetime (τ) = 0.29 ms, and lowest quantum efficiencies (η) = 24%, were obtained for (N(C 12 H 25) 2 (CH 3) 2) + [Eu(bmdm) 4 ]-, while (N(C 4 H 9) 4) + [Eu(bmdm) 4 ]has the longest τ = 1.04 ms and η = 90%. The Judd-Ofelt intensity parameters (Ω 2 and Ω 4) strongly changes for tta series pointing to stronger ion-dipole interactions between the-CF 3 group with the ammonium cations. The agreement between the experimental results of photoluminescence and theoretical data suggests that the geometries optimized by the Sparkle model are correct. These results point to potential candidates for building up Langmuir-Blodgett (LB) luminescent films, since it is possible to maximize the intermolecular interactions and the photoluminescent properties of tetrakis Ln III complexes.

show abstract

Influence of local structure on luminescence dynamics of red emitting ZnO:Eu3+ nanostructures and its Judd-Ofelt analysis

Cited by 40 publications

References 55 publications

Bright red luminescence emission of macroporous honeycomb-like Eu3+ ion-doped ZnO nanoparticles developed by gel-combustion technique

Bright red luminescence emission of macroporous honeycomb-like Eu3+ ion-doped ZnO nanoparticles developed by gel-combustion technique

Cost-effective ZnO–Eu3+ films with efficient energy transfer between host and dopant

The Influence of Different Ammonium Cations on the Optical Properties of Tetrakis GdIII and EuIII Complexes

Contact Info

Product

Resources

About