Photoluminescence mechanisms of metallic Zn nanospheres, semiconducting ZnO nanoballoons, and metal-semiconductor Zn/ZnO nanospheres.
We utilized a thermal radiation method to synthesize semiconducting hollow ZnO nanoballoons and metal-semiconductor concentric solid Zn/ZnO nanospheres from metallic solid Zn nanospheres. The chemical properties, crystalline structures, and photoluminescence mechanisms for the metallic solid Zn nanospheres, semiconducting hollow ZnO nanoballoons, and metal-semiconductor concentric solid Zn/ZnO nanospheres are presented. The PL emissions of the metallic Zn solid nanospheres are mainly dependent on the electron transitions between the Fermi level (E(F)) and the 3d band, while those of the semiconducting hollow ZnO nanoballoons are ascribed to the near band edge (NBE) and deep level electron transitions. The PL emissions of the metal-semiconductor concentric solid Zn/ZnO nanospheres are attributed to the electron transitions across the metal-semiconductor junction, from the E(F) to the valence and 3d bands, and from the interface states to the valence band. All three nanostructures are excellent room-temperature light emitters.
1] Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan, R.O.C [2] Institute of Physics, Academia Sinica, Taipei 11529, Taiwan, R.O.C.
Jin-Han
JH
Lin
Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan, R.O.C.
Ranjit A
RA
Patil
Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan, R.O.C.
Rupesh S
RS
Devan
Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan, R.O.C.
Zhe-An
ZA
Liu
Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 106, Taiwan, R.O.C.
Yi-Ping
YP
Wang
Graduate Institute of Applied Science and Technology, National Taiwan University of Science and Technology, Taipei 106, Taiwan, R.O.C.
Ching-Hwa
CH
Ho
Institute of Physics, Academia Sinica, Taipei 11529, Taiwan, R.O.C.
Yung
Y
Liou
Department of Physics, National Dong Hwa University, Hualien 97401, Taiwan, R.O.C.
Yuan-Ron
YR
Ma