Analysis of Nd 3+ concentration on the structure, morphology and photoluminescence of sol-gel Sr <inf>3</inf> ZnAl <inf>2</inf> O <inf>7</inf> nanophosphor

Motlalepula Rebecca Mhlongo; L. F. Koao; T. E. Motaung; R. E. Kroon; Setumo Victor Motloung

doi:10.1016/j.rinp.2019.02.004

Analysis of Nd 3+ concentration on the structure, morphology and photoluminescence of sol-gel Sr <inf>3</inf> ZnAl <inf>2</inf> O <inf>7</inf> nanophosphor

Motlalepula Rebecca Mhlongo^*, L. F. Koao, T. E. Motaung, R. E. Kroon, Setumo Victor Motloung

^*Corresponding author for this work

Physics

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

7 Citations (Scopus)

Abstract

© 2019 The Authors Neodymium activated strontium zinc aluminate (Sr 3 ZnAl 2 O 7 :x%Nd 3+ ) nanophosphor was synthesized using the sol-gel technique whereby the Nd 3+ concentration was varied in the range 0 ≤ x ≤ 2. The effect of Nd 3+ concentration on the structure, particle morphology and photoluminescence properties of Sr 3 ZnAl 2 O 7 were investigated. The X-ray diffraction (XRD) results revealed that all samples resembled the mixture of both ZnAl 2 O 4 and Sr 3 Al 2 O 6 cubic structures. Nd 3+ doping influenced the crystallite sizes of the prepared phosphor materials. The energy dispersive X-ray spectroscopy (EDS) results confirmed the presence of all expected elements in the composition. Scanning electron microscopy (SEM) revealed that as the Nd 3+ concentration increased the surface morphology changed to smooth mountain-like structures. The ultraviolet–visible (UV–Vis) diffuse reflection spectroscopy showed that the band gap of Sr 3 ZnAl 2 O 7 can be tuned from 2.74 to 2.95 eV by increasing the Nd 3+ concentration. When the host is excited above the bandgap (374 nm), broad emission attributed to defects occurs with the maximum near 585 nm. Doped samples excited in this manner do not exhibit additional luminescence due to the Nd 3+ ions, but in contrast there is a small dip in the defect emission band near 585 nm due to absorption attributed to Nd 3+ ions. Characteristic infrared emissions of Nd 3+ ions at 885, 1064 and 1340 nm were observed by directly exciting the Nd 3+ ions at 585 nm ( 4 I 9/2 → 5 G 5/2 + 2 G 7/2 ) and were attributed to 4 F 3/2 → 4 I 9/24 I 11/2 and 4 I 13/2 transitions, respectively. The Commission Internationale de l'Eclairage (CIE) coordinates results showed that the orange emission colour is from the host.

Original language	English
Pages (from-to)	1786-1796
Number of pages	11
Journal	Results in Physics
Volume	12
DOIs	https://doi.org/10.1016/j.rinp.2019.02.004 https://doi.org/10.1016/j.rinp.2019.02.004
Publication status	Published - 1 Mar 2019

Keywords

CIE
Nd activated
Photoluminescence
Sol-gel
Sr ZnAl O

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Mhlongo, M. R., Koao, L. F., Motaung, T. E., Kroon, R. E., & Motloung, S. V. (2019). Analysis of Nd 3+ concentration on the structure, morphology and photoluminescence of sol-gel Sr <inf>3</inf> ZnAl <inf>2</inf> O <inf>7</inf> nanophosphor. Results in Physics, 12, 1786-1796. https://doi.org/10.1016/j.rinp.2019.02.004, https://doi.org/10.1016/j.rinp.2019.02.004

@article{ae2dfaee5c6f4503a60292c67ebf9ba6,

title = "Analysis of Nd 3+ concentration on the structure, morphology and photoluminescence of sol-gel Sr 3 ZnAl 2 O 7 nanophosphor",

abstract = "{\textcopyright} 2019 The Authors Neodymium activated strontium zinc aluminate (Sr 3 ZnAl 2 O 7 :x%Nd 3+ ) nanophosphor was synthesized using the sol-gel technique whereby the Nd 3+ concentration was varied in the range 0 ≤ x ≤ 2. The effect of Nd 3+ concentration on the structure, particle morphology and photoluminescence properties of Sr 3 ZnAl 2 O 7 were investigated. The X-ray diffraction (XRD) results revealed that all samples resembled the mixture of both ZnAl 2 O 4 and Sr 3 Al 2 O 6 cubic structures. Nd 3+ doping influenced the crystallite sizes of the prepared phosphor materials. The energy dispersive X-ray spectroscopy (EDS) results confirmed the presence of all expected elements in the composition. Scanning electron microscopy (SEM) revealed that as the Nd 3+ concentration increased the surface morphology changed to smooth mountain-like structures. The ultraviolet–visible (UV–Vis) diffuse reflection spectroscopy showed that the band gap of Sr 3 ZnAl 2 O 7 can be tuned from 2.74 to 2.95 eV by increasing the Nd 3+ concentration. When the host is excited above the bandgap (374 nm), broad emission attributed to defects occurs with the maximum near 585 nm. Doped samples excited in this manner do not exhibit additional luminescence due to the Nd 3+ ions, but in contrast there is a small dip in the defect emission band near 585 nm due to absorption attributed to Nd 3+ ions. Characteristic infrared emissions of Nd 3+ ions at 885, 1064 and 1340 nm were observed by directly exciting the Nd 3+ ions at 585 nm ( 4 I 9/2 → 5 G 5/2 + 2 G 7/2 ) and were attributed to 4 F 3/2 → 4 I 9/24 I 11/2 and 4 I 13/2 transitions, respectively. The Commission Internationale de l'Eclairage (CIE) coordinates results showed that the orange emission colour is from the host.",

keywords = "CIE, Nd activated, Photoluminescence, Sol-gel, Sr ZnAl O",

author = "Mhlongo, {Motlalepula Rebecca} and Koao, {L. F.} and Motaung, {T. E.} and Kroon, {R. E.} and Motloung, {Setumo Victor}",

note = "Funding Information: This work is supported by the South African National Research Foundation (NRF) Thuthuka programme (fund number: UID 99266 and 113947 ), Sefako Makgatho Health Science University (SMU) Research Development Grant (RDG) and SMU Electron Microscope Unit. This work is based on the research supported in part by the National Research Foundation of South Africa (R.E. Kroon, Grant Number 93214 ). The author acknowledges Prof M Diale for her contribution towards this article. Funding Information: This work is supported by the South African National Research Foundation (NRF) Thuthuka programme (fund number: UID 99266 and 113947), Sefako Makgatho Health Science University (SMU) Research Development Grant (RDG) and SMU Electron Microscope Unit. This work is based on the research supported in part by the National Research Foundation of South Africa (R.E. Kroon, Grant Number 93214). The author acknowledges Prof M Diale for her contribution towards this article. Publisher Copyright: {\textcopyright} 2019 The Authors Copyright: Copyright 2019 Elsevier B.V., All rights reserved.",

year = "2019",

month = mar,

day = "1",

doi = "10.1016/j.rinp.2019.02.004",

language = "English",

volume = "12",

pages = "1786--1796",

journal = "Results in Physics",

issn = "2211-3797",

publisher = "Elsevier BV",

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TY - JOUR

T1 - Analysis of Nd 3+ concentration on the structure, morphology and photoluminescence of sol-gel Sr 3 ZnAl 2 O 7 nanophosphor

AU - Mhlongo, Motlalepula Rebecca

AU - Koao, L. F.

AU - Motaung, T. E.

AU - Kroon, R. E.

AU - Motloung, Setumo Victor

N1 - Funding Information: This work is supported by the South African National Research Foundation (NRF) Thuthuka programme (fund number: UID 99266 and 113947 ), Sefako Makgatho Health Science University (SMU) Research Development Grant (RDG) and SMU Electron Microscope Unit. This work is based on the research supported in part by the National Research Foundation of South Africa (R.E. Kroon, Grant Number 93214 ). The author acknowledges Prof M Diale for her contribution towards this article. Funding Information: This work is supported by the South African National Research Foundation (NRF) Thuthuka programme (fund number: UID 99266 and 113947), Sefako Makgatho Health Science University (SMU) Research Development Grant (RDG) and SMU Electron Microscope Unit. This work is based on the research supported in part by the National Research Foundation of South Africa (R.E. Kroon, Grant Number 93214). The author acknowledges Prof M Diale for her contribution towards this article. Publisher Copyright: © 2019 The Authors Copyright: Copyright 2019 Elsevier B.V., All rights reserved.

PY - 2019/3/1

Y1 - 2019/3/1

N2 - © 2019 The Authors Neodymium activated strontium zinc aluminate (Sr 3 ZnAl 2 O 7 :x%Nd 3+ ) nanophosphor was synthesized using the sol-gel technique whereby the Nd 3+ concentration was varied in the range 0 ≤ x ≤ 2. The effect of Nd 3+ concentration on the structure, particle morphology and photoluminescence properties of Sr 3 ZnAl 2 O 7 were investigated. The X-ray diffraction (XRD) results revealed that all samples resembled the mixture of both ZnAl 2 O 4 and Sr 3 Al 2 O 6 cubic structures. Nd 3+ doping influenced the crystallite sizes of the prepared phosphor materials. The energy dispersive X-ray spectroscopy (EDS) results confirmed the presence of all expected elements in the composition. Scanning electron microscopy (SEM) revealed that as the Nd 3+ concentration increased the surface morphology changed to smooth mountain-like structures. The ultraviolet–visible (UV–Vis) diffuse reflection spectroscopy showed that the band gap of Sr 3 ZnAl 2 O 7 can be tuned from 2.74 to 2.95 eV by increasing the Nd 3+ concentration. When the host is excited above the bandgap (374 nm), broad emission attributed to defects occurs with the maximum near 585 nm. Doped samples excited in this manner do not exhibit additional luminescence due to the Nd 3+ ions, but in contrast there is a small dip in the defect emission band near 585 nm due to absorption attributed to Nd 3+ ions. Characteristic infrared emissions of Nd 3+ ions at 885, 1064 and 1340 nm were observed by directly exciting the Nd 3+ ions at 585 nm ( 4 I 9/2 → 5 G 5/2 + 2 G 7/2 ) and were attributed to 4 F 3/2 → 4 I 9/24 I 11/2 and 4 I 13/2 transitions, respectively. The Commission Internationale de l'Eclairage (CIE) coordinates results showed that the orange emission colour is from the host.

AB - © 2019 The Authors Neodymium activated strontium zinc aluminate (Sr 3 ZnAl 2 O 7 :x%Nd 3+ ) nanophosphor was synthesized using the sol-gel technique whereby the Nd 3+ concentration was varied in the range 0 ≤ x ≤ 2. The effect of Nd 3+ concentration on the structure, particle morphology and photoluminescence properties of Sr 3 ZnAl 2 O 7 were investigated. The X-ray diffraction (XRD) results revealed that all samples resembled the mixture of both ZnAl 2 O 4 and Sr 3 Al 2 O 6 cubic structures. Nd 3+ doping influenced the crystallite sizes of the prepared phosphor materials. The energy dispersive X-ray spectroscopy (EDS) results confirmed the presence of all expected elements in the composition. Scanning electron microscopy (SEM) revealed that as the Nd 3+ concentration increased the surface morphology changed to smooth mountain-like structures. The ultraviolet–visible (UV–Vis) diffuse reflection spectroscopy showed that the band gap of Sr 3 ZnAl 2 O 7 can be tuned from 2.74 to 2.95 eV by increasing the Nd 3+ concentration. When the host is excited above the bandgap (374 nm), broad emission attributed to defects occurs with the maximum near 585 nm. Doped samples excited in this manner do not exhibit additional luminescence due to the Nd 3+ ions, but in contrast there is a small dip in the defect emission band near 585 nm due to absorption attributed to Nd 3+ ions. Characteristic infrared emissions of Nd 3+ ions at 885, 1064 and 1340 nm were observed by directly exciting the Nd 3+ ions at 585 nm ( 4 I 9/2 → 5 G 5/2 + 2 G 7/2 ) and were attributed to 4 F 3/2 → 4 I 9/24 I 11/2 and 4 I 13/2 transitions, respectively. The Commission Internationale de l'Eclairage (CIE) coordinates results showed that the orange emission colour is from the host.

KW - CIE

KW - Nd activated

KW - Photoluminescence

KW - Sol-gel

KW - Sr ZnAl O

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U2 - 10.1016/j.rinp.2019.02.004

DO - 10.1016/j.rinp.2019.02.004

M3 - Article

SN - 2211-3797

VL - 12

SP - 1786

EP - 1796

JO - Results in Physics

JF - Results in Physics

ER -

Analysis of Nd <sup>3+</sup> concentration on the structure, morphology and photoluminescence of sol-gel Sr <inf>3</inf> ZnAl <inf>2</inf> O <inf>7</inf> nanophosphor

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