Surface Defect Suppression for High Color Purity Light-Emitting Diode of Free-Standing Single-Crystal Perovskite Film

Lutao Li; Yun Hu; Yuan ChenChen WangGuoxiang ZhaoXinyu DuChaoqiang WangLingbo XiaoZheng LuJiong WangDan WangJiansheng JieJingsong HuangGuifu Zou

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Surface Defect Suppression for High Color Purity Light-Emitting Diode of Free-Standing Single-Crystal Perovskite Film

机译：Surface Defect Suppression for High Color Purity Light-Emitting Diode of Free-Standing Single-Crystal Perovskite Film

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High color purity is one of the important features for single-crystal metalhalide perovskite light-emitting diode (LED). Despite single-crystal perovskiteshowing low bulk defect concentration, single-crystal perovskite LEDs donot exhibit high color purity advantage due to the absence of effective surfacedefect passivation. Herein, one fully wrapped structure is proposed topassivate the surface of the free-standing CsPbBr3 single-crystal films. Thesurface of CsPbBr_3 single-crystal films is wrapped by ultra-thin polymethylmethacrylate, precisely controlling the thickness. The single-crystal perovskitefilm device can achieve high color purity with a full width at half maximum(FWHM) of 15.8 nm) and a large luminescent area of 2.25 mm~2. It is observedthat surface passivation is due to interaction of C=O bond in polymer chainswith the Lewis acid PbBr2. The passivated perovskite single-crystal filmssignificantly improve carrier lifetime and suppress surface defects. It is noteworthythat the passivated free-standing single-crystal perovskite films arefeasible to build up a vertical LED device structure, avoiding the edge glowingand short-circuiting of the LED device. This study demonstrates the largeluminescent area of the high-quality millimetre-scale free-standing singlecrystalfilms for wide color gamut display and vertical optoelectronic devices.

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来源
《Advanced functional materials》 |2023年第29期|2301205.1-2301205.10|共10页
作者
Lutao Li; Yun Hu; Yuan ChenChen WangGuoxiang ZhaoXinyu DuChaoqiang WangLingbo XiaoZheng LuJiong WangDan WangJiansheng JieJingsong HuangGuifu Zou;
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作者单位

College of EnergySoochow Institute for Energy and Materials InnovationsKey Laboratory of Advanced Carbon Materials and Wearable EnergyTechnologies of Jiangsu ProvinceSoochow UniversitySuzhou 215000, China;

Institute of Functional Nano & Soft Materials (FUNSOM)Jiangsu Key Laboratory for Carbon-Based Functional Materials & DevicesSoochow UniversitySuzhou 215123, China;

Oxford Suzhou Centre for Advanced ResearchUniversity of OxfordSuzhou 215123, China;

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正文语种英语
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halide perovskites; high color purity; light-emitting diodes; single-crystal films; surface defect suppression;

Surface Defect Suppression for High Color Purity Light-Emitting Diode of Free-Standing Single-Crystal Perovskite Film

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