期刊
APPLIED SURFACE SCIENCE
卷 480, 期 -, 页码 122-130出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2019.02.209
关键词
Sb-doped p-ZnO quantum dots; ZnO homojunction; Low-temperature solution process; White light-emitting diodes
类别
资金
- Samsung Research Funding Center of Samsung Electronics [SRFC-MA1301-07]
- Graduate School of Yonsei University Research Scholarship Grants in 2017
Zinc oxide (ZnO) is an attractive metal oxide material in optoelectronics because of its visible light-emitting property caused by various deep-level defects. To exploit this property to its full potential in optoelectronic device applications, it is necessary to synthesize quantum-dot sized ZnO and to obtain p-type ZnO for achieving a p-n homojunction. In this study, for the first time, Sb-doped p-ZnO quantum dots (QDs) were successfully synthesized with a doping concentration of 0.5, 1, 2, and 5 at.% by a facile solution process at a low temperature of 30 degrees C. The obtained Sb-doped p-ZnO QDs exhibited strong and broad deep-level emission due to various deep-level defects. The p-type conductivity of the Sb-doped p-ZnO QDs was confirmed by applying QDs to a channel layer in TFTs. By using the obtained Sb-doped p-ZnO QDs as a p-type layer and growing n-ZnO nanorods (NRs) hydrothermally on top of the p-ZnO QD layer, ZnO-based homojunction white light-emitting diodes (WLEDs) were successfully fabricated. The fabricated WLEDs exhibited naked-eye observable white light emitting over the entire visible spectral region.
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