Polyethylenimine Insulativity-Dominant Charge-Injection Balance for Highly Efficient Inverted Quantum Dot Light-Emitting Diodes

ACS Applied Materials & Interfaces
Ke DingLei Wang

Abstract

Quantum dot (QD) light-emitting diodes (QLEDs) with an inverted architecture suffer from charge-injection imbalance and severe QD charging, which degrade device performance. Blocking excess electron injection into QDs is crucial for efficient inverted QLEDs. It is observed that polyethylenimine (PEI) has two opposite effects on electron injection: one is blocking electron injection by its intrinsic insulativity and the other one is promoting electron injection by reducing the work function of ZnO/PEI. In this work, the insulating nature of PEI has been dominantly utilized to reduce electron injection and the charge-injection balance is realized when PEI becomes thicker and blocks more excess electrons. Furthermore, PEI contributes to QD charging suppression and results in a smoother surface morphology than that of ZnO nanoparticles, which is beneficial for leakage current reduction and QD deposition. As a result, the optimized QLED with 15 nm PEI shows a 2.5 times improved efficiency compared to that of the QLED without PEI. Also, the QLED possesses the maximum external quantum efficiency and current efficiency of 16.5% and 18.8 cd/A, respectively, accompanied with a low efficiency roll-off of 15% at 1000 cd/m2, which is compar...Continue Reading

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Citations

Jan 31, 2019·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Yizhe SunShuming Chen
Jul 11, 2019·Dalton Transactions : an International Journal of Inorganic Chemistry·Qiong WeiYi Zhao
Jan 21, 2018·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Jie YuYuliang Zhao
Aug 10, 2021·Advanced Materials·Fei QinYinhua Zhou
Jun 8, 2018·ACS Applied Materials & Interfaces·Ikjun ChoWan Ki Bae
Mar 18, 2020·ACS Applied Materials & Interfaces·Tyler Davidson-Hall, Hany Aziz
Sep 24, 2019·ACS Applied Materials & Interfaces·Qizhen ChenTailiang Guo
Apr 7, 2020·The Journal of Physical Chemistry Letters·Dongqiang LiuYunjun Wang
Aug 28, 2021·Nanomaterials·Mariya ZvaigznePavel Samokhvalov
Sep 15, 2021·ACS Applied Materials & Interfaces·Ting WangWenyu Ji
Nov 20, 2021·ACS Applied Materials & Interfaces·Jia-Yi DongShuang-Peng Wang

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