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

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)2565-2574
Number of pages10
JournalACS Energy Letters
StatePublished - 2021
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemistry (miscellaneous)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Materials Chemistry


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