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Song, Myoung Hoon
Organic Photonics & Optoelectronics Lab
Research Interests
  • Organic optoelectrics, perovskite light-emitting diodes, surface treatment, photonic crystals

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A-Site Cation Engineering for Efficient Blue-Emissive Perovskite Light-Emitting Diodes

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Title
A-Site Cation Engineering for Efficient Blue-Emissive Perovskite Light-Emitting Diodes
Author
Park, Jong HyunJang, Chung HyeonJung, Eie DaeLee, SeungjinSong, Myoung HoonLee, Bo Ram
Issue Date
2020-12
Publisher
Multidisciplinary Digital Publishing Institute (MDPI)
Citation
ENERGIES, v.13, no.25, pp.6689
Abstract
Metal halide perovskites have been investigated for the next-generation light-emitting materials because of their advantages such as high photoluminescence quantum yield (PLQY), excellent color purity, and facile color tunability. Recently, red- and green-emissive perovskite light-emitting diodes (PeLEDs) have shown an external quantum efficiency (EQE) of over 20%, whereas there is still room for improvement for blue emissive PeLEDs. By controlling the halide compositions of chloride (Cl−) and bromide (Br−), the bandgap of perovskites can be easily tuned for blue emission. However, halide segregation easily occurrs in the mixed-halide perovskite under light irradiation and LED operation because of poor phase stability. Here, we explore the effect of A-site cation engineering on the phase stability of the mixed-halide perovskites and find that a judicious selection of low dipole moment A cation (formamidinium or cesium) suppresses the halide segregation. This enables efficient bandgap tuning and electroluminescence stability for sky blue emissive PeLEDs over the current density of 15 mA/cm2.
URI
https://scholarworks.unist.ac.kr/handle/201301/49003
URL
https://www.mdpi.com/1996-1073/13/24/6689
DOI
10.3390/en13246689
ISSN
1996-1073
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