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- Title
White light electroluminescence from poly(9-vinylcarbazole) (PVK)/ZnO NRs/poly(2-methoxy-5-(2-ethylhexyloxy)-1, 4-phenylenevinylene) (MEH-PPV) dual heterojunctions.
- Authors
Wang, You-Wei; Xu, Jian-Ping; Wang, Hao; Li, Shu-Bin; Shi, Qing-Liang; Hong, Yuan; Jiang, Li-Fang; Yuan, Hu-Chen; Li, Lan
- Abstract
In this paper, we fabricated a p-PVK/n-ZnO nanorods (NRs)/p-MEH-PPV dual heterojunctions white light-emitting diode. Relative to previously reported p-n heterojunction structure including ZnO NRs and polymer, the device exhibits a low turn-on voltage of 7 V. An obviously broad electroluminescence emission band, originated from the overlap of PVK emission and ZnO defects emissions, was observed extending from 360 up to 700 nm. The influence of the two introduced p-type polymer layers on the device characteristic is discussed. With its hole conductivity, the p-PVK layer cannot only improve the holes tunnel into ZnO NRs layer, but also lower the barrier between ITO and the valance band of ZnO NRs. On the other hand, p-MEH-PPV could be regarded as block layer for the injection of electrons from the Al electrode. Both of two p-type polymers dramatically improve the injection balance of carriers, leading to a low turn-on voltage. Meanwhile, the carrier transport mechanism of the device under different forward bias region was discussed on the basis of current-voltage curve.
- Subjects
ELECTROLUMINESCENCE; CARBAZOLE; HETEROJUNCTIONS; ZINC oxide; MICROFABRICATION; NANORODS
- Publication
Applied Physics A: Materials Science & Processing, 2014, Vol 116, Issue 4, p1921
- ISSN
0947-8396
- Publication type
Article
- DOI
10.1007/s00339-014-8354-y