A ZnO Nanorod Inorganic/Organic Heterostructure Light-Emitting Diode Emitting at 342 nm

An inorganic/organic heterostructure light-emitting diode consisting of the hole-transporting layer N,N′-di(naphth-2-yl)-N,N′-diphenylbenzidine (NPB) and n-type ZnO nanorods fabricated by hydrothermal decomposition is reported. Poly(methyl methacrylate) was used to form a smooth surface on top of Zn...

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Veröffentlicht in:	Nano letters 2008-04, Vol.8 (4), p.1219-1223
Hauptverfasser:	Sun, X. W, Huang, J. Z, Wang, J. X, Xu, Z
Format:	Artikel
Sprache:	eng
Schlagworte:	Applied sciences Condensed matter: electronic structure, electrical, magnetic, and optical properties Cross-disciplinary physics: materials science rheology Electron states and collective excitations in thin films, multilayers, quantum wells, mesoscopic and nanoscale systems Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures Electronics Exact sciences and technology Materials science Nanocrystalline materials Nanoscale materials and structures: fabrication and characterization Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures Optoelectronic devices Physics Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
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Zusammenfassung:	An inorganic/organic heterostructure light-emitting diode consisting of the hole-transporting layer N,N′-di(naphth-2-yl)-N,N′-diphenylbenzidine (NPB) and n-type ZnO nanorods fabricated by hydrothermal decomposition is reported. Poly(methyl methacrylate) was used to form a smooth surface on top of ZnO nanorod array with ZnO nanorod tops exposed for subsequent NPB deposition. An unusual ultraviolet emission at 342 nm was observed in the electroluminescence spectrum. Compared to band gap energy of ZnO (3.37 eV), the excitonic emission is blue-shifted and broadened. The mechanism of the blue shift is discussed in terms of the energy band diagram of the heterostructure.
ISSN:	1530-6984 1530-6992
DOI:	10.1021/nl080340z