Characterization of annealed Eu3+-doped ZnO flower-like morphology synthesized by chemical bath deposition method

L. F. Koao; B. F. Dejene; H. C. Swart; S. V. Motloung; T. E. Motaung

doi:10.1016/j.optmat.2016.07.042

Characterization of annealed Eu³⁺-doped ZnO flower-like morphology synthesized by chemical bath deposition method

L. F. Koao^*, B. F. Dejene, H. C. Swart, S. V. Motloung, T. E. Motaung

^*Corresponding author for this work

Physics

Research output: Contribution to journal › Article › peer-review

40 Citations (Scopus)

Abstract

Undoped and europium ion (Eu³⁺) doped ZnO nanostructures were synthesized via the chemical bath deposition method and annealed afterwards in air at 700 °C. The X-ray diffraction measurements confirmed the hexagonal wurtzite structure for all samples. The scanning electron microscopy (SEM) revealed that the nanopowder samples were assembled in flower-like shapes for undoped and hexagonal-shaped for Eu³⁺-doped ZnO. Elemental energy dispersive (EDS) analysis mapping conducted on the samples revealed homogeneous distribution of Zn, O, and Eu ions. The Ultraviolet–visible (UV–vis) diffusion reflectance spectroscopy showed a decrease in the band gap with an increasing Eu³⁺ concentration. The photoluminescence (PL) results showed that by exciting Eu³⁺ (4 mol%) doped ZnO with different excitation wavelength the highest luminescence intensity was observed at an excitation wavelength of 395 nm but no emissions were observed from Eu³⁺. By exciting further with 465 nm the Eu³⁺ emissions were observed and emission from undoped ZnO was found for the first time.

Original language	English
Pages (from-to)	294-304
Number of pages	11
Journal	Optical Materials
Volume	60
DOIs	https://doi.org/10.1016/j.optmat.2016.07.042
Publication status	Published - 1 Oct 2016

Keywords

Luminescence
Nanostructures
Optical properties
X-ray diffraction

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10.1016/j.optmat.2016.07.042

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title = "Characterization of annealed Eu3+-doped ZnO flower-like morphology synthesized by chemical bath deposition method",

abstract = "Undoped and europium ion (Eu3+) doped ZnO nanostructures were synthesized via the chemical bath deposition method and annealed afterwards in air at 700 °C. The X-ray diffraction measurements confirmed the hexagonal wurtzite structure for all samples. The scanning electron microscopy (SEM) revealed that the nanopowder samples were assembled in flower-like shapes for undoped and hexagonal-shaped for Eu3+-doped ZnO. Elemental energy dispersive (EDS) analysis mapping conducted on the samples revealed homogeneous distribution of Zn, O, and Eu ions. The Ultraviolet–visible (UV–vis) diffusion reflectance spectroscopy showed a decrease in the band gap with an increasing Eu3+ concentration. The photoluminescence (PL) results showed that by exciting Eu3+ (4 mol%) doped ZnO with different excitation wavelength the highest luminescence intensity was observed at an excitation wavelength of 395 nm but no emissions were observed from Eu3+. By exciting further with 465 nm the Eu3+ emissions were observed and emission from undoped ZnO was found for the first time.",

keywords = "Luminescence, Nanostructures, Optical properties, X-ray diffraction",

author = "Koao, {L. F.} and Dejene, {B. F.} and Swart, {H. C.} and Motloung, {S. V.} and Motaung, {T. E.}",

note = "Publisher Copyright: {\textcopyright} 2016 Elsevier B.V.",

year = "2016",

month = oct,

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doi = "10.1016/j.optmat.2016.07.042",

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T1 - Characterization of annealed Eu3+-doped ZnO flower-like morphology synthesized by chemical bath deposition method

AU - Koao, L. F.

AU - Dejene, B. F.

AU - Swart, H. C.

AU - Motloung, S. V.

AU - Motaung, T. E.

PY - 2016/10/1

Y1 - 2016/10/1

N2 - Undoped and europium ion (Eu3+) doped ZnO nanostructures were synthesized via the chemical bath deposition method and annealed afterwards in air at 700 °C. The X-ray diffraction measurements confirmed the hexagonal wurtzite structure for all samples. The scanning electron microscopy (SEM) revealed that the nanopowder samples were assembled in flower-like shapes for undoped and hexagonal-shaped for Eu3+-doped ZnO. Elemental energy dispersive (EDS) analysis mapping conducted on the samples revealed homogeneous distribution of Zn, O, and Eu ions. The Ultraviolet–visible (UV–vis) diffusion reflectance spectroscopy showed a decrease in the band gap with an increasing Eu3+ concentration. The photoluminescence (PL) results showed that by exciting Eu3+ (4 mol%) doped ZnO with different excitation wavelength the highest luminescence intensity was observed at an excitation wavelength of 395 nm but no emissions were observed from Eu3+. By exciting further with 465 nm the Eu3+ emissions were observed and emission from undoped ZnO was found for the first time.

AB - Undoped and europium ion (Eu3+) doped ZnO nanostructures were synthesized via the chemical bath deposition method and annealed afterwards in air at 700 °C. The X-ray diffraction measurements confirmed the hexagonal wurtzite structure for all samples. The scanning electron microscopy (SEM) revealed that the nanopowder samples were assembled in flower-like shapes for undoped and hexagonal-shaped for Eu3+-doped ZnO. Elemental energy dispersive (EDS) analysis mapping conducted on the samples revealed homogeneous distribution of Zn, O, and Eu ions. The Ultraviolet–visible (UV–vis) diffusion reflectance spectroscopy showed a decrease in the band gap with an increasing Eu3+ concentration. The photoluminescence (PL) results showed that by exciting Eu3+ (4 mol%) doped ZnO with different excitation wavelength the highest luminescence intensity was observed at an excitation wavelength of 395 nm but no emissions were observed from Eu3+. By exciting further with 465 nm the Eu3+ emissions were observed and emission from undoped ZnO was found for the first time.

KW - Luminescence

KW - Nanostructures

KW - Optical properties

KW - X-ray diffraction

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DO - 10.1016/j.optmat.2016.07.042

M3 - Article

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SN - 0925-3467

VL - 60

SP - 294

EP - 304

JO - Optical Materials

JF - Optical Materials

ER -

Characterization of annealed Eu³⁺-doped ZnO flower-like morphology synthesized by chemical bath deposition method

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Keywords

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