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Anion-exchange red perovskite quantum dots with ammonium iodine salts for highly efficient light-emitting devices

Nature Photonics volume 12, pages 681–687 (2018)Cite this article

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Abstract

Perovskite quantum dots have significant potential for light-emitting devices because of their high colour purity and colour tunability in the visible spectrum. Here, we report highly efficient red perovskite quantum dot-based light-emitting devices. The quantum dots were fabricated by anion exchange from pristine CsPbBr3 using halide-anion-containing alkyl ammonium and aryl ammonium salts. Anion-exchange quantum dots based on ammonium iodine salts exhibited a strong redshift from green emission to a deep-red emission at 649 nm as well as higher photoluminescence quantum yields. Furthermore, the quantum dot-based light-emitting device with the alkyl ammonium iodine salt exhibited an external quantum efficiency of 21.3% and high colour purity, with Commission Internationale de l’Eclairage coordinates of (0.72, 0.28), while the light-emitting device with the aryl ammonium iodine salt showed an external quantum efficiency of 14.1%. Finally, the operational stability of the latter was 36 times higher because the surface ligand density of the corresponding quantum dots was lower.

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Fig. 1: Scheme of anion-exchange of synthesized pristine CsPbBr3 perovskite QDs using long alkyl ammonium and aryl ammonium.
Fig. 2: Chemical composition and surface ligands of perovskite QDs.
Fig. 3: Nanocrystal structures and optical properties of perovskite QDs.
Fig. 4: Morphologies of perovskite QD films.
Fig. 5: Characteristics of perovskite QD LEDs.

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The data that support the plots within this paper and other findings of this study are available from the corresponding authors upon reasonable request.

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Acknowledgements

The authors acknowledge a ‘Grant-in Aid for Scientific Research A’ (grant no. 15H02203) from the Japan Society for the Promotion of Science (JSPS). The authors also thank the Center of Innovation Program and the Strategic Promotion of Innovative R&D Program of the Japan Science and Technology Agency (JST). The authors thank Y. Watanabe and K. Udagawa for help.

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Author notes

  1. Yong-Jin Pu

    Present address: RIKEN Center for Emergent Matter Science, Saitama, Japan

Authors and Affiliations

  1. Graduate School of Organic Materials Science, Yamagata, Japan

    Takayuki Chiba, Yukihiro Hayashi, Hinako Ebe, Keigo Hoshi, Jun Sato, Shugo Sato, Yong-Jin Pu, Satoru Ohisa & Junji Kido

  2. Research Center for Organic Materials, Yamagata, Japan

    Takayuki Chiba, Satoru Ohisa & Junji Kido

  3. Frontier Center for Organic Materials, Yamagata University, Yamagata, Japan

    Takayuki Chiba, Satoru Ohisa & Junji Kido

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Contributions

T.C. conceived and designed the experiments. Y.H. and J.S. fabricated the devices. Y.H., H.E. and K.H. performed the TEM, SEM, AFM, UV–vis absorption, photoluminescence and photoluminescence lifetime measurements. H.E. performed the XRD measurements. T.C. and S.O. performed the XPS and UPS measurements. Y.H. and S.S. developed and performed the anion-exchange process. T.C. and Y.J.P. assisted with the materials and LED characterization process. J.K. supervised this work. T.C. wrote the manuscript. All the authors have read and commented on the manuscript.

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Correspondence to Takayuki Chiba or Junji Kido.

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Chiba, T., Hayashi, Y., Ebe, H. et al. Anion-exchange red perovskite quantum dots with ammonium iodine salts for highly efficient light-emitting devices. Nature Photon 12, 681–687 (2018). https://doi.org/10.1038/s41566-018-0260-y

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