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Highly enhanced luminescence of ZnO green phosphors by calcining ZnS with NH4Br as additive |
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| Authors: | Li Zhen-hua Zhong Dan Li Yong-xiu |
| Institution: | a Department of Chemistry, Research Center for Rare Earths & Nano/micro Functional Materials, Nanchang University, Nanchang, Jiangxi 330031, China b Institute for Advanced Study, Nanchang University, Nanchang, Jiangxi 330031, China |
| Abstract: | Zinc oxide (ZnO) phosphors with highly efficient green emission have been prepared by calcining ZnS with NH4Br as additive in air atmosphere. The luminescent properties of as-prepared ZnO phosphors were characterized by X-ray photoelectron spectroscopy and photoluminescence. Our results reveal that the green emission is ascribed to a transition of a photo-generated electron from the localized defect centers (Vo+) to a deeply trapped hole (VZn−) within the band gap. The addition of NH4Br enhances the luminescent emission of ZnO by promoting the formation of vacancies of both oxygen and zinc. |
| Keywords: | ZnO NH4Br XPS Green phosphor Defects |
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