Improved Visible Emission from ZnO Nanoparticles Synthesized via the Co-Precipitation Method

被引:15
作者
Apostoluk, Alexandra [1 ]
Zhu, Yao [1 ]
Gautier, Pierrick [2 ]
Valette, Audrey [2 ]
Bluet, Jean-Marie [1 ]
Cornier, Thibaut [2 ]
Masenelli, Bruno [1 ]
Daniele, Stephane [2 ,3 ]
机构
[1] Univ Lyon, INL INSA Lyon, CNRS, UMR 5270, F-69621 Villeurbanne, France
[2] Univ Lyon, IRCE Lyon, CNRS, UMR 5256, F-69626 Villeurbanne, France
[3] Univ Claude Bernard Lyon 1, Univ Lyon, C2P2 UMR 5265, ESCPE Lyon, BP 2077, F-69616 Villeurbanne, France
关键词
ZnO nanoparticles; co-precipitation; luminescence quantum efficiency; OPTICAL-PROPERTIES; NANOSTRUCTURES; DYE; CO;
D O I
10.3390/ma16155400
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Since ZnO nanoparticles (NPs) possess a variety of intrinsic defects, they can provide a wide spectrum of visible emission, without adding any impurity or any doping atoms. They are attracting more and more interest as a material for light sources and energy downshifting systems. However, defect emission with a high luminescence quantum efficiency (PL QY) is difficult to obtain. Here, we present the co-precipitation synthesis parameters permitting to attain ZnO NPs with highly visible PL QYs. We found that the nature of zinc precursors and alkaline hydroxide (KOH or LiOH) used in this method affects the emission spectra and the PL QY of the as-grown ZnO NPs. LiOH is found to have an advantageous effect on the visible emission efficiency when added during the synthesis of the ZnO NPs. More precisely, LiOH permits to increase the emission efficiency in the visible up to 13%. We discuss the effects of the nanoparticle size, the morphology and the surface stabilization on the enhancement of the luminescent emission efficiency. Various spectral contributions to the luminescent emission were also examined, in order to achieve a control of the defect emission to increase its efficiency.
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页数:20
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