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

Research output: Contribution to journalArticle

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Abstract

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.

Original languageEnglish
Pages (from-to)192-199
Number of pages8
JournalJournal of Crystal Growth
Volume277
Issue number1-4
DOIs
Publication statusPublished - 2005 Apr 15

Fingerprint

Sol-gel process
Photoluminescence
gels
photoluminescence
Powders
Defects
defects
Oxygen vacancies
ambience
Excitons
oxygen
Optical properties
wurtzite
Oxygen
Transmission electron microscopy
X ray diffraction
interstitials
excitons
Air
optical properties

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Cheng, Hsin Ming ; Hsu, Hsu-Cheng ; Chen, Shiow Lian ; Wu, Wen Ti ; Kao, Chih Chun ; Lin, Li Jiaun ; Hsieh, Wen Feng. / Efficient UV photoluminescence from monodispersed secondary ZnO colloidal spheres synthesized by sol-gel method. In: Journal of Crystal Growth. 2005 ; Vol. 277, No. 1-4. pp. 192-199.
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Efficient UV photoluminescence from monodispersed secondary ZnO colloidal spheres synthesized by sol-gel method. / Cheng, Hsin Ming; Hsu, Hsu-Cheng; Chen, Shiow Lian; Wu, Wen Ti; Kao, Chih Chun; Lin, Li Jiaun; Hsieh, Wen Feng.

In: Journal of Crystal Growth, Vol. 277, No. 1-4, 15.04.2005, p. 192-199.

Research output: Contribution to journalArticle

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AU - Cheng, Hsin Ming

AU - Hsu, Hsu-Cheng

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AU - Kao, Chih Chun

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AU - Hsieh, Wen Feng

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AB - 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.

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