城戸・笹部・千葉研究室の佐藤純君(2019年卒業)と千葉貴之助教の金属ドープを利用した青色ペロブスカイトナノ結晶に関する論文がACS Applied Materials & Interfaces (IF: 8.758)に掲載されました。
Neodymium Chloride-Doped Perovskite Nanocrystals for Efficient Blue Light-Emitting Devices
Takayuki Chiba*, Jun Sato, Shota Ishikawa, Yoshihito Takahashi, Hinako Ebe,
Shunsuke Sumikoshi, Satoru Ohisa, and Junji Kido*
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.