期刊
JOURNAL OF LUMINESCENCE
卷 131, 期 4, 页码 620-622出版社
ELSEVIER
DOI: 10.1016/j.jlumin.2010.11.002
关键词
ZnO; Nanocrystal; Luminescence; Surface passivation
类别
Intense band-edge photoluminescence is observed from ZnO nanocrystals with an average diameter of about 3 nm. It is found that the growth from high temperature (70 degrees C) precursor solution and succeeding surface passivation by MgO layer together lead to a five times enhancement of band-edge luminescence, in comparison to those grown by conventional low-temperature method without surface passivation. It is also found that above-band-gap illumination on the nanocrystals further enhances the luminescence intensity by five times. The strong photo-enhancement is considered to be aided by the reduction of surface non-radiative recombination path. (C) 2010 Elsevier B.V. All rights reserved.
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