Cathodoluminescence of ZnO Crystals Prepared via Electric Current Heating Method Using Zn Wire

Abstract:

Zn wire was used as starting material in the fabrication of ZnO crystals in which a glass substrate was placed above the wire to grow ZnO crystals. The wire was heated by electric current in air. When the wire broke because of Joule heating, smoke arose from the wire and ZnO crystals were observed on the broken point, in the vicinity of the broken point, and on the glass substrate. The morphology and cathodoluminescence of the crystals were investigated. The crystals on the wire were 0.2–5 μm in size. The peak intensity ratio of ultraviolet (UV) emission to green emission increased with decreasing crystal size. The crystals on the substrate were tetrapod-like; the length and diameter of the tetrapod legs were 100–500 nm and 10–30 nm, respectively. The tetrapod-like nanocrystals produced only UV emissions.

• Periodical: Key Engineering Materials (Volume 485)
• Pages: 261-264
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.485.261
• Online since: July 2011
• Authors: Takumi Hagizawa, Yuichiro Kuroki, Tomoichiro Okamoto, Masasuke Takata
• Keywords: Cathodoluminescence, Electric Current Heating Method, UV Emission, Zinc Oxide (ZnO)

References

[1] V. Srikant and D.R. Clarke: J. Appl. Phys. Vol. 83 (1998), p.5447.

[2] K.K. Kim, J.H. Song, H.J. Jung and W.K. Choi: J. Appl. Phys. Vol. 87 (2000), p.3573.

[3] B.D. Yao, Y.F. Chan and N. Wang: Appl. Phys. Lett. Vol. 81 (2002), p.757.

[4] W.I. Park, D.H. Kim, S.W. Jung and G.C. Yi: Appl. Phys. Lett. Vol. 80 (2002), p.4232.

[5] M. Kawasaki, A. Ohtomo, I. Ohkubo, H. Koinuma, Z.K. Tang, P. Yu, G.K.L. Wong, B.P. Zhang and Y. Segawa: Mater. Sci. Eng. Vol. 24 (1998), p.1354.

[6] M. Kawakami, A.B. Hartanto, Y. Nakata and T. Okada: Jpn. J. Appl. Phys. Vol. 42 (2003), p.33.

[7] S. Cho, J. Ma, Y. Kim, Y. Sun, G.K.L. Wong and J.B. Ketterson: Appl. Phys. Lett. Vol. 75 (1999), p.2761.

[8] D. Nezaki, S. Takano, Y. Kuroki, Y. Kurihara, T. Okamoto and M. Takata: Trans. MRS-J. Vol. 25 (2000), p.205.

[9] D. Nezaki, T. Okamoto and M. Takata: Key Eng. Mater. Vol. 241 (2002), p.228.

[10] D. Nezaki, M. Yasuda, T. Yasui and M. Takata: Solid State Ionics Vol. 172 (2004), p.353.

DOI: 10.1016/j.ssi.2004.02.069

[11] H. Yamasaki, K. Minato, D. Nezaki, T. Okamoto, A. Kawamoto and M. Takata: Solid State Ionics Vol. 172 (2004), p.349.

DOI: 10.1016/j.ssi.2004.02.050

[12] X. Liu, X. Wu, H. Cao and R.P.H. Chang: J. Appl. Phys. Vol. 95 (2004), p.3141.

[13] N.Y. Garces, L. Wang, L. Bai, N.C. Giles, L.E. Halliburton and G. Cantwell: Appl. Phys. Lett. Vol. 81 (2002), p.622.

[14] D.M. Bagnall, Y.F. Shen, Z. Zhu, T. Goto and T. Yao: J. Cryst. Growth Vol. 184-185 (1998), p.605.

[15] Y. Fujiki and M. Mitomo: Whisker (Sangyo tosho, Japan 1993) p.2.