Room temperature ultraviolet emission from ZnO nanocrystallites fabricated by the low temperature oxidation of metallic Zn precursors
✍ Scribed by Tae-Won Kim; Tadashi Kawazoe; Shunsuke Yamazaki; Jungsik Lim; Takashi Yatsui; Motoichi Ohtsu
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 345 KB
- Volume
- 127
- Category
- Article
- ISSN
- 0038-1098
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✦ Synopsis
We have successfully fabricated ZnO nanocrystallites emitting strong ultraviolet radiation at room temperature via the simple thermal oxidation of metallic Zn precursors at 380 8C. X-ray diffraction measurements showed only the diffraction peak from ZnO, revealing that metallic Zn precursors were successfully oxidized even at the low temperature of 380 8C. The mean size of the ZnO nanocrystallites determined using Scherrer's formula was ca. 30 nm. Room temperature photoluminescence measurements using a cw He -Cd laser ðl ¼ 325 nmÞ showed a strong emission peak at 3.27 eV, which was ascribed to free excition recombination. These results suggest that sufficient oxygen can diffuse into the metallic Zn precursors, even at temperatures as low as 380 8C, to allow the fabrication of pure ZnO nanocrystallites.