期刊
ACS APPLIED MATERIALS & INTERFACES
卷 12, 期 48, 页码 53891-53898出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.0c11736
关键词
perovskite; nanocrystals; metal halides doping neodymium chloride; light-emitting devices
资金
- Japan Society for the Promotion of Science (JSPS) [20 K05639]
- Adaptable and Seamless Technology transfer program through Target-driven RD (A-STEP)
- Center of Innovation Program from the Japan Science and Technology Agency (JST)
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 An-el 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.
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