DataVXACS Energy LettersPaper
journal article·2021-07-09Open access

A New Type of Hybrid Copper Iodide as Nontoxic and Ultrastable LED Emissive Layer Material

Kun Zhu, Zhongkai Cheng, Sylvie Rangan, Mircea Cotlet, Jingbo Du, Leila Kasaei, Simon J. Teat, Wei Liu, Yifei Chen, Leonard C. Feldman, Deirdre M. O’Carroll, Jing Li

ACS Energy Letters· Volume 6· Issue 7
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Abstract

Perovskite-based light-emitting diodes (PeLEDs) are promising candidates for next-generation solid-state lighting and display technologies. However, all current high-performance PeLEDs contain a toxic element (lead) and suffer from relatively low stability. Herein, we report a new type of lead-free LED using low-cost, eco-friendly, and robust copper(I) iodide hybrid material as the emissive layer (EML). Specifically, they are composed of copper iodide chains and organic ligands through ionic and coordinate bonds. Their remarkable stability and solution processability stem from this unique multifold bonding feature. High-quality thin films of 1D-Cu4I6(bttmp)2 were fabricated by a simple, one-step spin-coating process. They exhibit high photoluminescence quantum yield (91%) and long-term air stability (>2000 h). An EQE of 5.02% was achieved for a prototype yellow LED using 1D-Cu4I6(bttmp)2 EML. Its half-lifetime of 35.5 h obtained in open air outperforms that of most PeLEDs reported to date. This work opens a new direction for making LEDs based on ecofriendly and robust hybrid materials.
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Research context

Electronic materials

OpenAlex topics: Perovskite Materials and Applications · Quantum Dots Synthesis And Properties · Advanced Photocatalysis Techniques

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

Affiliations

Department of Chemistry and Chemical Biology, Rutgers University, 123 Bevier Road, Piscataway, New Jersey 08854, United States

Department of Materials Science and Engineering, Rutgers University, 607 Taylor Road, Piscataway, New Jersey 08854, United States

Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway Township, New Jersey 08854, United States

Center for Functional Nanomaterials, Brookhaven National Laboratory, 98 Rochester Street, Upton, New York 11973, United States

Key Laboratory for Green Chemical Technology of Ministry of Education, R&D Center for Petrochemical Technology, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, 20 Yizhi Road, Nankai District, Tianjin 300072, P.R. China

Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, United States

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