Influence of ultrasonication times on the tunable colour emission of ZnO nanophosphors for lighting applications

Vinod Kumar; H. C. Swart; Mukut Gohain; Vijay Kumar; S. Som; B. C.B. Bezuindenhoudt; O. M. Ntwaeaborwa

doi:10.1016/j.ultsonch.2014.01.019

Influence of ultrasonication times on the tunable colour emission of ZnO nanophosphors for lighting applications

Vinod Kumar, H. C. Swart, Mukut Gohain, Vijay Kumar, S. Som, B. C.B. Bezuindenhoudt, O. M. Ntwaeaborwa

University of The Free State

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

73 Citations (Scopus)

Abstract

This paper reports on the sonochemical synthesis of zinc oxide (ZnO) nanophosphors (NPr) at different ultrasonication times (5 min, 30 min, 1 h, 5 h, 10 h and 15 h) for near white light emission applications. X-ray photoelectron spectroscopy indicated that the O1s peak consists of two components. These were O1 (ZnO) and O2 (deficient oxygen; OH groups) centred at 529.7 ± 0.3 eV and 531.1 ± 0.3 eV, respectively. All samples showed UV and defect level emission (DLE). The DLE enhancement was due to the increase in oxygen related defects such as oxygen vacancies/interstitials. Due to the combination of near UV and DLE near white light emission in ZnO NPr was obtained. The emission could be tuned with different ultrasonic times. It was found that the ultrasonication time influenced the growth mechanism and luminescence properties of the ZnO NPr.

Original language	English
Pages (from-to)	1549-1556
Number of pages	8
Journal	Ultrasonics Sonochemistry
Volume	21
Issue number	4
DOIs	https://doi.org/10.1016/j.ultsonch.2014.01.019
Publication status	Published - Jul 2014
Externally published	Yes

Keywords

Defect level emission
Sonochemical method
Ultrasonication time
ZnO

ASJC Scopus subject areas

Chemical Engineering (miscellaneous)
Environmental Chemistry
Radiology, Nuclear Medicine and Imaging
Acoustics and Ultrasonics
Organic Chemistry
Inorganic Chemistry

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10.1016/j.ultsonch.2014.01.019

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title = "Influence of ultrasonication times on the tunable colour emission of ZnO nanophosphors for lighting applications",

abstract = "This paper reports on the sonochemical synthesis of zinc oxide (ZnO) nanophosphors (NPr) at different ultrasonication times (5 min, 30 min, 1 h, 5 h, 10 h and 15 h) for near white light emission applications. X-ray photoelectron spectroscopy indicated that the O1s peak consists of two components. These were O1 (ZnO) and O2 (deficient oxygen; OH groups) centred at 529.7 ± 0.3 eV and 531.1 ± 0.3 eV, respectively. All samples showed UV and defect level emission (DLE). The DLE enhancement was due to the increase in oxygen related defects such as oxygen vacancies/interstitials. Due to the combination of near UV and DLE near white light emission in ZnO NPr was obtained. The emission could be tuned with different ultrasonic times. It was found that the ultrasonication time influenced the growth mechanism and luminescence properties of the ZnO NPr.",

keywords = "Defect level emission, Sonochemical method, Ultrasonication time, ZnO",

author = "Vinod Kumar and Swart, {H. C.} and Mukut Gohain and Vijay Kumar and S. Som and Bezuindenhoudt, {B. C.B.} and Ntwaeaborwa, {O. M.}",

year = "2014",

month = jul,

doi = "10.1016/j.ultsonch.2014.01.019",

language = "English",

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AU - Kumar, Vinod

AU - Swart, H. C.

AU - Gohain, Mukut

AU - Kumar, Vijay

AU - Som, S.

AU - Bezuindenhoudt, B. C.B.

AU - Ntwaeaborwa, O. M.

PY - 2014/7

Y1 - 2014/7

N2 - This paper reports on the sonochemical synthesis of zinc oxide (ZnO) nanophosphors (NPr) at different ultrasonication times (5 min, 30 min, 1 h, 5 h, 10 h and 15 h) for near white light emission applications. X-ray photoelectron spectroscopy indicated that the O1s peak consists of two components. These were O1 (ZnO) and O2 (deficient oxygen; OH groups) centred at 529.7 ± 0.3 eV and 531.1 ± 0.3 eV, respectively. All samples showed UV and defect level emission (DLE). The DLE enhancement was due to the increase in oxygen related defects such as oxygen vacancies/interstitials. Due to the combination of near UV and DLE near white light emission in ZnO NPr was obtained. The emission could be tuned with different ultrasonic times. It was found that the ultrasonication time influenced the growth mechanism and luminescence properties of the ZnO NPr.

AB - This paper reports on the sonochemical synthesis of zinc oxide (ZnO) nanophosphors (NPr) at different ultrasonication times (5 min, 30 min, 1 h, 5 h, 10 h and 15 h) for near white light emission applications. X-ray photoelectron spectroscopy indicated that the O1s peak consists of two components. These were O1 (ZnO) and O2 (deficient oxygen; OH groups) centred at 529.7 ± 0.3 eV and 531.1 ± 0.3 eV, respectively. All samples showed UV and defect level emission (DLE). The DLE enhancement was due to the increase in oxygen related defects such as oxygen vacancies/interstitials. Due to the combination of near UV and DLE near white light emission in ZnO NPr was obtained. The emission could be tuned with different ultrasonic times. It was found that the ultrasonication time influenced the growth mechanism and luminescence properties of the ZnO NPr.

KW - Defect level emission

KW - Sonochemical method

KW - Ultrasonication time

KW - ZnO

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DO - 10.1016/j.ultsonch.2014.01.019

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SN - 1350-4177

VL - 21

SP - 1549

EP - 1556

JO - Ultrasonics Sonochemistry

JF - Ultrasonics Sonochemistry

IS - 4

ER -

Influence of ultrasonication times on the tunable colour emission of ZnO nanophosphors for lighting applications

Abstract

Keywords

ASJC Scopus subject areas

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