TY - JOUR
T1 - Zn (II)-Doped Cesium Copper Halide Nanocrystals with High Quantum Yield and Colloidal Stability for High-Resolution X‑Ray Imaging
AU - Qu, Kang
AU - Lu, Yangbin
AU - Ran, Peng
AU - Wang, Kun
AU - Zhang, Nan
AU - Xia, Kaiyu
AU - Zhang, Hongyan
AU - Pi, Xiaodong
AU - Hu, Hanlin
AU - Yang, Yang
AU - He, Qingquan
AU - Yin, Jun
AU - Pan, Jun
N1 - Funding Information:
This work was supported by the National Key Research and Development Project of China (2022YFE0113800), National Natural Science Foundation of China (Grant Nos. 52172160 and 21805181), Leading Innovative and Entrepreneur Team Introduction Program of Zhejiang (2020R01002), and Fundamental Research Funds for the Provincial Universities of Zhejiang (RF‐C2022005). J.Y. acknowledges financial support from the Hong Kong Polytechnic University (P0042930).
Publisher Copyright:
© 2023 Wiley-VCH GmbH.
PY - 2023/4/4
Y1 - 2023/4/4
N2 - Scintillators are essential for high-energy radiation detection in a variety of potential applications. However, due to complex fabrication processes and nanocrystal homogeneity, conventional scintillators are challenging to meet the need for cost-effective, environmentally friendly, and flexible X-ray detection. Here, monodisperse nanocrystals (NCs) with small grain size and colloidal stability are obtained by adjusting the doping concentration of Zn2+ ions and controlling the morphology uniformity of Cs3Cu2I5 NCs. The photoluminescence quantum yield (PLQY) for the optimal doping concentration is as high as 92.8%, which is a 28.5% improvement compared to nondoped NCs. Density functional theory calculations reveal that the Zn2+ dopant inclines to occupy Cu sites and the I-rich condition suppresses the formation of I vacancy, enriching the excited electron density at the band-edge to enhance the self-trapped exciton emission. Moreover, high luminescence performance and flexible X-ray scintillator films are prepared using Zn2+-doped Cs3Cu2I5 NCs, with a spatial resolution of up to 15.7 lp mm–1. This work provides an effective strategy for the development of environmentally friendly, low-cost, and efficient blue-emitting 0D all-inorganic metal halides, as well as shows their great potential for high-performance flexible lead-free and low-toxicity X-ray detector applications.
AB - Scintillators are essential for high-energy radiation detection in a variety of potential applications. However, due to complex fabrication processes and nanocrystal homogeneity, conventional scintillators are challenging to meet the need for cost-effective, environmentally friendly, and flexible X-ray detection. Here, monodisperse nanocrystals (NCs) with small grain size and colloidal stability are obtained by adjusting the doping concentration of Zn2+ ions and controlling the morphology uniformity of Cs3Cu2I5 NCs. The photoluminescence quantum yield (PLQY) for the optimal doping concentration is as high as 92.8%, which is a 28.5% improvement compared to nondoped NCs. Density functional theory calculations reveal that the Zn2+ dopant inclines to occupy Cu sites and the I-rich condition suppresses the formation of I vacancy, enriching the excited electron density at the band-edge to enhance the self-trapped exciton emission. Moreover, high luminescence performance and flexible X-ray scintillator films are prepared using Zn2+-doped Cs3Cu2I5 NCs, with a spatial resolution of up to 15.7 lp mm–1. This work provides an effective strategy for the development of environmentally friendly, low-cost, and efficient blue-emitting 0D all-inorganic metal halides, as well as shows their great potential for high-performance flexible lead-free and low-toxicity X-ray detector applications.
KW - cesium copper halide
KW - composite films
KW - doping
KW - nanocrystals
KW - X-ray imaging
UR - http://www.scopus.com/inward/record.url?scp=85146996656&partnerID=8YFLogxK
U2 - 10.1002/adom.202202883
DO - 10.1002/adom.202202883
M3 - Journal article
AN - SCOPUS:85146996656
SN - 2195-1071
VL - 11
JO - Advanced Optical Materials
JF - Advanced Optical Materials
IS - 7
M1 - 2202883
ER -