Influence of indium-tin-oxide and emitting-layer thicknesses on light outcoupling of perovskite light-emitting diodes

Nano Convergence
Young-Jin JungJeong-Hwan Lee

Abstract

Metal halide perovskite light-emitting diodes (PeLEDs) are emerging as a promising candidate for next-generation optoelectronic devices. The efficiency of PeLEDs has developed explosively in a short time, but their overall efficiency is still low. This is strongly related to the high refractive indexes of indium-tin-oxide (ITO) and perovskite emitting layers. Various outcoupling strategies are being introduced to outcouple the light trapped inside the layers. However, the proposed methods have experimental challenges that need to be overcome for application to large-area electronics. Based on optical simulations, we demonstrate that the thicknesses of the ITO and perovskite layers are key parameters to improve the outcoupling efficiency of PeLEDs. In addition, the optical energy losses of PeLEDs can be reduced significantly by properly adjusting the thicknesses of the two layers. This leads to outstanding optical performance with a maximum EQE greater than 20% without using any other external outcoupling strategies.

References

Aug 5, 2014·Nature Nanotechnology·Zhi-Kuang TanRichard H Friend
Mar 4, 2015·Scientific Reports·Sohee JeonJae Ryoun Youn
May 8, 2015·Nature Nanotechnology·Samuel D Stranks, Henry J Snaith
May 15, 2015·Optics Express·Chang-Ki MoonJang-Joo Kim
Nov 18, 2015·Advanced Materials·Yichuan LingHanwei Gao
Jun 28, 2016·Nature Nanotechnology·Mingjian YuanEdward H Sargent
Oct 30, 2016·Proceedings of the National Academy of Sciences of the United States of America·Young-Hoon KimTae-Woo Lee
Jun 8, 2017·Nature Communications·Liuqi ZhangJingbi You
Feb 15, 2019·The Journal of Physical Chemistry Letters·Chenghao BiAndrey L Rogach

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Citations

Mar 18, 2021·Reports on Progress in Physics·Ziming ChenHin-Lap Yip
Jun 18, 2021·ACS Nano·Amrita DeyLakshminarayana Polavarapu

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