Highly Stable Cesium Lead Iodide Perovskite Quantum Dot Light-Emitting Diodes

Joseph Luther, Chen Zou, Chun-Ying Huang, Erin Sanehira, Lih Lin

Research output: Contribution to journalArticlepeer-review

44 Scopus Citations


Recently, all-inorganic perovskites such as CsPbBr3 and CsPbI3, have emerged as promising materials for light-emitting applications. While encouraging performance has been demonstrated, the stability issue of the red-emitting CsPbI3 is still a major concern due to its small tolerance factor. Here we report a highly stable CsPbI3 quantum dot (QD) light-emitting diode (LED) with red emission fabricated using an improved purification approach. The device achieved decent external quantum efficiency (EQE) of 0.21% at a bias of 6 V and outstanding operational stability, with a L70 lifetime (EL intensity decreases to 70% of starting value) of 16 h and 1.5 h under a constant driving voltage of 5 V and 6 V (maximum EQE operation) respectively. Furthermore, the device can work under a higher voltage of 7 V (maximum luminance operation) and retain 50% of its initial EL intensity after 500 s. These findings demonstrate the promise of CsPbI3 QDs for stable red LEDs, and suggest the feasibility for electrically pumped perovskite lasers with further device optimizations.

Original languageAmerican English
Article numberArticle No. 455201
Number of pages7
Issue number45
StatePublished - 16 Oct 2017

Bibliographical note

Publisher Copyright:
© 2017 IOP Publishing Ltd.

NREL Publication Number

  • NREL/JA-5900-68649


  • LED
  • perovskite quantum dot
  • red emission
  • stability


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