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<p>Quasi-two-dimensional (quasi-2D) perovskites have emerged as promising candidates for high-performance light-emitting diodes (LEDs) due to their unique energy funneling mechanism. However, uncontrollable phase distribution during film crystallization often leads to excessive formation of lower <i>n</i>-phases, which hinder efficient charge transport and radiative recombination. In this study, we demonstrate a facile and effective strategy to modulate the phase distribution and crystallinity of quasi-2D perovskite PEA<sub>2</sub>(FA<sub>0.7</sub>Cs<sub>0.3</sub>)<sub><i>n</i>−1</sub>Pb<sub>n</sub>Br<sub>3n+1</sub> thin films using a volatile antisolvent, isopropyl alcohol (IPA). Structural and optical investigations revealed that the IPA treatment effectively suppressed the insulating lower <i>n</i>-phases (<i>n</i> &lt; 2) and promoted the growth of higher <i>n</i>-domains (<i>n</i> &gt; 3). Optimized IPA treatment of 100 <i>µl</i> yields a high photoluminescence quantum yield and balanced energy funneling, whereas excessive IPA (&gt; 300 <i>µl</i>) leads to phase oversimplification and morphological defects. Consequently, the green LED fabricated with 100 <i>µl</i> of IPA-treated emissive layer achieved a remarkable peak external quantum efficiency of 19.2% and high luminance, representing a nearly fivefold improvement over the pristine device. This work verifies the critical role of volatile antisolvent engineering in tailoring the energy landscape for high-efficiency perovskite optoelectronics.</p>

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Performance Enhancement of Quasi-2D Perovskite Light-Emitting Diodes Based on Phase Control by Volatile Antisolvent Treatment

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Seung-Beom Cho,
  • Ju-Hyeong Kim,
  • Chang-Xu Li,
  • Il-Kyu K. Park

摘要

Quasi-two-dimensional (quasi-2D) perovskites have emerged as promising candidates for high-performance light-emitting diodes (LEDs) due to their unique energy funneling mechanism. However, uncontrollable phase distribution during film crystallization often leads to excessive formation of lower n-phases, which hinder efficient charge transport and radiative recombination. In this study, we demonstrate a facile and effective strategy to modulate the phase distribution and crystallinity of quasi-2D perovskite PEA2(FA0.7Cs0.3)n−1PbnBr3n+1 thin films using a volatile antisolvent, isopropyl alcohol (IPA). Structural and optical investigations revealed that the IPA treatment effectively suppressed the insulating lower n-phases (n < 2) and promoted the growth of higher n-domains (n > 3). Optimized IPA treatment of 100 µl yields a high photoluminescence quantum yield and balanced energy funneling, whereas excessive IPA (> 300 µl) leads to phase oversimplification and morphological defects. Consequently, the green LED fabricated with 100 µl of IPA-treated emissive layer achieved a remarkable peak external quantum efficiency of 19.2% and high luminance, representing a nearly fivefold improvement over the pristine device. This work verifies the critical role of volatile antisolvent engineering in tailoring the energy landscape for high-efficiency perovskite optoelectronics.