Journal
ORGANIC ELECTRONICS
Volume 80, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.orgel.2020.105656
Keywords
Sol-gel process; Doped zinc oxide; Electron transport layer; Quantum dot; Light-emitting diode
Funding
- Polish National Science Centre within the project OPUS 14 [2017/27/B/ST5/01209]
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In this study, sol-gel derived Zn1-xMgxO (ZMO) is proposed as an electron transport layer (ETL) for solution-processed quantum-dot light-emitting diodes (QLEDs). It is demonstrated that the increase of Mg content in Zn1-xMgxO films from 0% to 20% causes a dramatic suppression of electron current, which is attributed to the lifting of conduction band minimum and reduction of electron mobility. As a result of Mg-doping, the charge carrier balance might be achieved in the QLED with the Zn0.85Mg0.15O layer resulting in maximum external quantum efficiency of 5.74% and current efficiency of 18 cd A(-1), which are over 3-fold higher than in the case of the device with ZnO layer. Improved device performance is further explained by reduced exciton quenching at QDs/ZMO interface, which is confirmed by time-resolved PL experiments. Obtained results indicate that sol-gel derived ZMO is a promising candidate for ETL in quantum-dot based optoelectronic devices.
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