期刊
NANOMATERIALS
卷 10, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/nano10040726
关键词
quantum dot (QD); light emitting diode (LED); metal oxide; double electron transport layer (ETL); SnO2 nanoparticles
类别
资金
- National Research Foundation of Korea (NRF) - Korea government (Ministry of Science and ICT) [NRF-2019R1C1C1005258, NRF-2020R1C1C1013079, NRF-2019R1C1C1006481]
The performance of colloidal quantum dot light-emitting diodes (QD-LEDs) have been rapidly improved since metal oxide semiconductors were adopted for an electron transport layer (ETL). Among metal oxide semiconductors, zinc oxide (ZnO) has been the most generally employed for the ETL because of its excellent electron transport and injection properties. However, the ZnO ETL often yields charge imbalance in QD-LEDs, which results in undesirable device performance. Here, to address this issue, we introduce double metal oxide ETLs comprising ZnO and tin dioxide (SnO2) bilayer stacks. The employment of SnO2 for the second ETL significantly improves charge balance in the QD-LEDs by preventing spontaneous electron injection from the ZnO ETL and, as a result, we demonstrate 1.6 times higher luminescence efficiency in the QD-LEDs. This result suggests that the proposed double metal oxide ETLs can be a versatile platform for QD-based optoelectronic devices.
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