Efficient UV photoluminescence from monodispersed secondary ZnO colloidal spheres synthesized by sol-gel method

Hsin Ming Cheng, Hsu Cheng Hsu, Shiow Lian Chen, Wen Ti Wu, Chih Chun Kao, Li Jiaun Lin, Wen Feng Hsieh

研究成果: Article同行評審

72 引文 斯高帕斯(Scopus)

摘要

ZnO colloidal spheres were synthesized by sol-gel method with a narrow size distribution. We controlled the size of the spheres during the secondary reaction with various amounts of primary reaction supernatant. The optimized condition of ZnO powders with an average diameter of 185 nm was obtained for structure analysis and study of optical properties. Transmission electron microscopy and X-ray diffraction reveal that the spheres are polycrystalline in the pure wurtzite phase. Markedly enhanced near-band-edge ultraviolet photoluminescence and significantly reduced defect-related visible emission were also observed. We attribute this observation to the localized bound excitons with high density of defect states. In addition, broad yellow emission and green emission were observed when the powders were post-annealed at 500 °C in air ambience. The origins of the defect-induced visible emissions are attributed to oxygen interstitials and oxygen vacancies.

原文English
頁(從 - 到)192-199
頁數8
期刊Journal of Crystal Growth
277
發行號1-4
DOIs
出版狀態Published - 2005 四月 15

All Science Journal Classification (ASJC) codes

  • 凝聚態物理學
  • 無機化學
  • 材料化學

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