High-Efficiency Perovskite-Organic Blend Light-Emitting Diodes Featuring Self-Assembled Monolayers as Hole-Injecting Interlayers

Murali Gedda; Despoina Gkeka; Mohamad Insan NugrahaAlberto D. ScaccabarozziEmre YengelJafar I. KhanIain HamiltonYuanbao LinMarielle DeconinckYana VaynzofFrederic LaquaiDonal D. C. BradleyThomas D. Anthopoulos

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High-Efficiency Perovskite-Organic Blend Light-Emitting Diodes Featuring Self-Assembled Monolayers as Hole-Injecting Interlayers

机译：High-Efficiency Perovskite-Organic Blend Light-Emitting Diodes Featuring Self-Assembled Monolayers as Hole-Injecting Interlayers

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The high photoluminescence efficiency, color purity, extended gamut, andsolution processability make low-dimensional hybrid perovskites attractivefor light-emitting diode (PeLED) applications. However, controlling themicrostructure of these materials to improve the device performance remainschallenging. Here, the development of highly efficient green PeLEDs basedon blends of the quasi-2D (q2D) perovskite, PEA_2Cs_4Pb_5Br_(16), and the widebandgap organic semiconductor 2,7 dioctyl[1] benzothieno[3,2-b]benzothiophene(C_8-BTBT) is reported. The presence of C_8-BTBT enables the formationof single-crystal-like q2D PEA_2Cs_4Pb_5Br_(16) domains that are uniform and highlyluminescent. Combining the PEA_2Cs_4Pb_5Br_(16):C_8-BTBT with self-assembledmonolayers (SAMs) as hole-injecting layers (HILs), yields green PeLEDs withgreatly enhanced performance characteristics, including external quantumefficiency up to 18.6%, current efficiency up to 46.3 cd A~(?1), the luminanceof 45 276 cd m~(?2), and improved operational stability compared to neatPeLEDs. The enhanced performance originates from multiple synergisticeffects, including enhanced hole-injection enabled by the SAM HILs, thesingle crystal-like quality of the perovskite phase, and the reduced concentrationof electronic defects. This work highlights perovskite:organic blends aspromising systems for use in LEDs, while the use of SAM HILs creates newopportunities toward simpler and more stable PeLEDs.

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《Advanced energy materials》 |2023年第33期|2201396.1-2201396.10|共10页
作者
Murali Gedda; Despoina Gkeka; Mohamad Insan NugrahaAlberto D. ScaccabarozziEmre YengelJafar I. KhanIain HamiltonYuanbao LinMarielle DeconinckYana VaynzofFrederic LaquaiDonal D. C. BradleyThomas D. Anthopoulos;
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King Abdullah University of Science and Technology (KAUST)KAUST Solar Center (KSC)Thuwal 23955–6900, Saudi Arabia;

King Abdullah University of Science and Technology (KAUST)Division of Physical Science and EngineeringThuwal 23955–6900, Saudi Arabia;

Dresden Integrated Center for Applied Physics and Photonic Materials(IAPP) and Center for Advancing Electronics Dresden (cfaed)Technische Universitaet Dresden01062 Dresden, GermanyKing Abdullah University of Science and Technology (KAUST)KAUST Solar Center (KSC)Thuwal 23955–6900, Saudi Arabia Research Center for Advanced MaterialsNational Research and Innovation Agency (BRIN)South Tangerang, Banten 15314, Indonesia;

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2D perovskites; interlayers; light-emitting diodes; organic semiconductors; self-assembled monolayers;

High-Efficiency Perovskite-Organic Blend Light-Emitting Diodes Featuring Self-Assembled Monolayers as Hole-Injecting Interlayers

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