Journal
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
Volume 64, Issue 1, Pages 110-116Publisher
SPRINGER
DOI: 10.1007/s10971-012-2836-1
Keywords
Porous silicon; Zinc oxide; Nanocomposite; Photoluminescence; Nanocrystal
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Funding
- Changzhou University [ZMF1002132]
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ZnO/porous silicon nanocomposites were fabricated by spin-coating the sol-gels of zinc acetate onto the top surface of porous silicon films. The photoluminescent properties of ZnO/porous silicon nanocomposites were investigated as a function of the concentration of zinc cations in the sol-gels. Characterizations with scanning electron microscopy, X-ray diffractometry and photospectroscopy indicated that ZnO nanocrystals were embedded into the spongy nanostructures of porous silicon after heat treatment at 245 A degrees C for 20 min in air. The recorded photoluminescence exhibited that orange to green-blue emissions were achieved for the ZnO/porous silicon nanocomposites as the concentration of zinc cations in the sol-gels increased from 4 to 260 mM. The mechanisms on the tunability of the photoluminescence were discussed for the ZnO/porous silicon nanocomposites. Our results have demonstrated that the incorporation of green-blue phosphors into the porous matrix of porous silicon represents one endeavor to tune the photoluminescence of porous silicon across the visible spectral region.
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