DataVXAdvanced MaterialsPaper
journal article·2024-05

Efficient and Bright Deep‐Red Light‐Emitting Diodes based on a Lateral 0D/3D Perovskite Heterostructure

You Ke, Jingshu Guo, Decheng Kong, Jingmin Wang, Gunnar Kusch, Chen Lin, Dawei Liu, Zhiyuan Kuang, Dongmin Qian, Fuyi Zhou, Guangbin Zhang, Meiling Niu, Yu Cao, Rachel A. Oliver, Daoxin Dai, Yizheng Jin, Nana Wang, Wei Huang, Jianpu Wang

Advanced Materials· Volume 36· Issue 20
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Source abstract

Abstract

Abstract Bright and efficient deep‐red light‐emitting diodes (LEDs) are important for applications in medical therapy and biological imaging due to the high penetration of deep‐red photons into human tissues. Metal‐halide perovskites have potential to achieve bright and efficient electroluminescence due to their favorable optoelectronic properties. However, efficient and bright perovskite‐based deep‐red LEDs have not been achieved yet, due to either Auger recombination in low‐dimensional perovskites or trap‐assisted nonradiative recombination in 3D perovskites. Here, a lateral Cs4PbI6/FAxCs1−xPbI3 (0D/3D) heterostructure that can enable efficient deep‐red perovskite LEDs at very high brightness is demonstrated. The Cs4PbI6 can facilitate the growth of low‐defect FAxCs1−xPbI3, and act as low‐refractive‐index grids, which can simultaneously reduce nonradiative recombination and enhance light extraction. This device reaches a peak external quantum efficiency of 21.0% at a photon flux of 1.75 × 1021 m−2 s−1, which is almost two orders of magnitude higher than that of reported high‐efficiency deep‐red perovskite LEDs. Theses LEDs are suitable for pulse oximeters, showing an error <2% of blood oxygen saturation compared with commercial oximeters.
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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Organic Light-Emitting Diodes Research · 2D Materials and Applications

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Shaanxi Institute of Flexible Electronics (SIFE) Xi'an Institute of Biomedical Materials & Engineering (IBME) Northwestern Polytechnical University (NPU) 127 West Youyi Road Xi'an 710072 China

Key Laboratory of Flexible Electronics (KLOFE) Institute of Advanced Materials (IAM) & School of Flexible Electronics (Future Technologies) Nanjing Tech University (NanjingTech) 30 South Puzhu Road Nanjing 211816 China

State Key Laboratory for Modern Optical Instrumentation College of Optical Science and Engineering International Research Center for Advanced Photonics Zhejiang University Zijingang Campus Hangzhou 310058 China

Department of Materials Science and Metallurgy University of Cambridge 27 Charles Babbage Road Cambridge CB3 0FS UK

Center for Chemistry of High‐Performance and Novel Materials State Key Laboratory of Silicon Materials and Department of Chemistry Zhejiang University Hangzhou 310027 China

Strait Laboratory of Flexible Electronics (SLoFE) Fuzhou Fujian 350117 China

Strait Institute of Flexible Electronics (SIFE Future Technologies) Fujian Normal University Fuzhou Fujian 350117 China

Funding

National Natural Science Foundation of China · National Science Fund for Distinguished Young Scholars

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