Perovskite Light-Emitting Diodes via Laser Crystallization: Systematic Investigation on Grain Size Effects for Device Performance

ACS Applied Materials & Interfaces
Sung Jin KimSang Ouk Kim

Abstract

Owing to unique potential for high color purity luminance based on low-cost solution processes, organic/inorganic hybrid perovskite light-emitting diodes (PeLEDs) are attracting a great deal of research attention. For high performance PeLEDs, optimum control of the perovskite film morphology is a critical parameter. Here, we introduce a reliable and well-controllable PeLED crystallization process based on beam-damage-free near-infrared laser (λ = 808 nm) irradiation. Morphology of the CH3NH3PbBr3 films can be precisely controlled by laser irradiation condition parameters: power density and beam scan rate. We systematically investigate the perovskite film morphology and device performance of the PeLEDs under different processing conditions. In the optimum power density and high beam scan rate (30 W cm-2, 0.1 mm s-1), a dense and smooth perovskite film is attained with a small crystal grain size. The critical relationship between the crystal grain size and LED efficiency is established while attaining the device performance of 0.95 cd A-1 efficiency and 1784 cd m-2.

References

Aug 5, 2014·Nature Nanotechnology·Zhi-Kuang TanRichard H Friend
May 8, 2015·The Journal of Physical Chemistry Letters·Dawei DiRichard H Friend
Aug 13, 2015·The Journal of Physical Chemistry Letters·Kaibo ZhengTõnu Pullerits
Nov 18, 2015·Advanced Materials·Yichuan LingHanwei Gao
May 24, 2016·Advanced Materials·Sjoerd A VeldhuisSubodh G Mhaisalkar
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Citations

Aug 9, 2018·Angewandte Chemie·Ken-Ichi YuyamaVasudevanpillai Biju
Apr 18, 2019·Nanotechnology·Patrik ŠčajevSaulius Juršėnas
May 5, 2020·Energy Technology : Generation, Conversion, Storage, Distribution·Lukas M FalkYana Vaynzof
Mar 18, 2021·Reports on Progress in Physics·Ziming ChenHin-Lap Yip
Dec 10, 2019·ACS Applied Materials & Interfaces·Mingue ShinByungha Shin
Aug 29, 2018·ACS Applied Materials & Interfaces·Yanliang LiuKwang Ho Kim
Jun 20, 2020·ACS Applied Materials & Interfaces·Jinwoo ByunSang Ouk Kim

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