Affiliation:
1. Department of Flexible and Printable Electronics LANL‐JBNU Engineering Institute‐Korea Jeonbuk National University Jeonju 54896 Republic of Korea
2. Department of Materials Science and Engineering 3D Convergence Center Inha University Incheon 22212 Republic of Korea
3. Advanced Functional Thin Films Department Korea Institute of Materials Science (KIMS) Changwon 641831 Republic of Korea
Abstract
AbstractFormamidinium lead bromide (FAPbBr3) nanocrystals (NCs) that exhibit ultra‐pure green emission are the most promising candidates for future displays. Despite the rapid development of light‐emitting diodes (LEDs) based on perovskite NCs (PeNCs), there is limited research detailing their intrinsic light outcoupling. Herein, the use of a short‐chain fluoroaromatic ligand, 4‐fluoro‐phenethylammonium bromide (FPEABr), via a facile spin‐casting method is proposed to fine‐tune the refractive index (n) and horizontal dipole ratio values (ΘH) of the perovskite emitter layer and simultaneously suppress the defects formed during film deposition. After FPEABr ligand exchange, the FAPbBr3 NC films exhibit a refractive index n that is significantly lower (by about 0.4) than bulk (2D/quasi‐2D or 3D) perovskite films and show an enhanced ΘH value of 77%. Therefore, ultra‐pure green perovskite LEDs are successfully produced with a maximum current efficiency of ≈50 cd A−1, a maximum luminance of 21 304 cd m−2, and a peak external quantum efficiency of 11.34% at a high luminance of 2804 cd m−2, approaching the theoretical value of 11.90% given the structure, photoluminescence quantum yield, and ΘH.
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
1 articles.
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