Light-emitting diodes fabricated from small-size ZnO quantum dots

Zinc oxide (ZnO) quantum dots (QDs) have been fabricated. High-resolution transmission electron microscopy shows that the ZnO QDs have a narrow size distribution, and are highly crystallized with wurtzite structure. Light-emitting diodes have been constructed by employing the QDs as active layers. I...

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Bibliographic Details
Published in:Materials letters 2012-05, Vol.74, p.104-106
Main Authors: Qiao, Q., Li, B.H., Shan, C.X., Liu, J.S., Yu, J., Xie, X.H., Zhang, Z.Z., Ji, T.B., Jia, Y., Shen, D.Z.
Format: Article
Language:English
Subjects:
emissions
Light-emitting diode
Luminescence
Quantum dot
quantum dots
Semiconductors
transmission electron microscopy
Zinc oxide
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Summary:Zinc oxide (ZnO) quantum dots (QDs) have been fabricated. High-resolution transmission electron microscopy shows that the ZnO QDs have a narrow size distribution, and are highly crystallized with wurtzite structure. Light-emitting diodes have been constructed by employing the QDs as active layers. Intense near-band-edge emissions have been observed from the diodes, which show a noticeable blue-shift compared with the emission of a similar diode employing ZnO film as an active layer, which is demonstrated to come from the quantum size effect of the QDs due to their small size. [Display omitted] ► Light-emitting diodes have been constructed based on small-sized ZnO QDs. ► Ultraviolet emission has been observed from the QDs-LEDs. ► The emission shows quantum size effect due to the small size of the QDs.
ISSN:0167-577X
1873-4979
DOI:10.1016/j.matlet.2012.01.048