Abstract
A heterojunction light-emitting diode (LED) based on p-type cobalt oxide (Co3O4) nanoplates (NPs)/n-type zinc oxide (ZnO) nanorods (NRs) is demonstrated. Using a low-temperature aqueous solution process, the n-type ZnO NRs were epitaxially grown on Co3O4 NPs which were two-dimensionally assembled by a modified Langmuir-Blodgett process. The heterojunction LEDs exhibited a typical rectifying behavior with a turn-on voltage of about 2V and emitted not only reddish-orange light at 610nm but also violet light at about 400nm. From the comparative analyses of electroluminescence and photoluminescence, it was determined that the reddish-orange light emission was related to the electronic transitions from zinc interstitials (Zni) to oxygen interstitials (Oi) or conduction-band minimum (CBM) to oxygen vacancies (VO), and the violet light emission was attribute to the transition from CBM to valence-band maximum (VBM) or Zni to zinc vacancies (VZn).
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