Neodymium Chloride-Doped Perovskite Nanocrystals for Efficient Blue Light-Emitting Devices

ACS Applied Materials & Interfaces
Takayuki ChibaJunji Kido

Abstract

Metal halides doping of perovskite nanocrystals (NCs) has been shown to precisely control nonradiative pathways and to improve photoluminescence quantum yield (PLQY). Here, we report a trivalent lanthanide halide neodymium (III) chloride (NdCl3)-doped perovskite NCs prepared with a post-synthetic room temperature treatment for efficient blue light-emitting devices (LEDs). The Nd 3d and Cl 2p core peaks were observed in the NdCl3-doped NCs, which allowed for simultaneous doping of Nd3+ and Cl- into the pristine CsPbBr3 NCs. The NdCl3-doped NCs exhibited blue emission at a peak wavelength of 478 nm with a high PLQY of 97% in solution. We found that the Nd3+ cation incorporated into the NCs more effectively suppressed nonradiative recombination compared with common halide anion exchange from temperature dependence of optical properties. Blue LEDs based on NdCl3-doped NCs had an external quantum efficiency of 2.7%, which represents a considerable performance improvement compared with LEDs based on organic chloride salt-doped NCs.

References

Jul 28, 2015·Journal of the American Chemical Society·Quinten A AkkermanLiberato Manna
Apr 28, 2017·Journal of the American Chemical Society·Brent A KoscherA Paul Alivisatos
Aug 2, 2017·Journal of the American Chemical Society·Shenghan ZouXueyuan Chen
Sep 3, 2017·Angewandte Chemie·Hung-Chia WangRu-Shi Liu
Jan 18, 2018·Journal of the American Chemical Society·Ji-Song YaoShu-Hong Yu
Jul 17, 2018·Journal of the American Chemical Society·Zi-Jun YongHong-Tao Sun
Sep 15, 2018·Advanced Materials·Taehwan JunHideo Hosono
Oct 12, 2018·Advanced Materials·Jizhong SongHaibo Zeng
Feb 15, 2019·The Journal of Physical Chemistry Letters·Chenghao BiAndrey L Rogach

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