Abstract
Materials that exhibit X-ray-excited luminescence have great potential in radiation detection, security inspection, biomedical applications and X-ray astronomy1,2,3,4,5. However, high-performance materials are almost exclusively limited to ceramic scintillators, which are typically prepared under high temperatures6. Herein we report metal-free organic phosphors based on a molecular design that supports efficient triplet exciton harvesting to enhance radioluminescence. These organic scintillators exhibit a detection limit of 33 nGy s–1, which is 167 times lower than the standard dosage for X-ray medical examination and we demonstrate their potential application in X-ray radiography. These findings provide a fundamental design principle and new route for the creation of promising alternatives to incumbent inorganic scintillators. Furthermore, they offer new opportunities for development of flexible, stretchable X-ray detectors and imagers for non-destructive radiography testing and medical imaging.
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Data availability
The data that support the plots within this paper and other findings of this study are available from the corresponding author on reasonable request. Source data are provided with this paper.
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Acknowledgements
This work is supported by the National Key R&D Program of China (grant no. 2020YFA0709900), the National Natural Science Foundation of China (grant nos. 21975120, 21875104, 91833304, 21973043, 51673095 and 61935017), the Joint Research Funds of Department of Science and Technology of Shaanxi Province and Northwestern Polytechnical University (grant no. 2020GXLH-Z-006), Natural Science Fund for Distinguished Young Scholars of Jiangsu Province (grant no. BK20180037), China National Postdoctoral Program for Innovative Talents (grant no. BX20200278), Projects of International Cooperation and Exchanges NSFC (grant no. 51811530018), the Fundamental Research Funds for the Central Universities, Agency for Science, Technology and Research (A*STAR) under its AME program (grant nos. A1883c0011 and A1983c0038), and the King Abdullah University of Science and Technology (KAUST) Office of Sponsored Research (OSR) under award no. OSR-2018-CRG7-3736.
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Contributions
X.W., H.S., Z.A., X.L and W.H. conceived the experiments. X.W., H.S., Z.A., X.L. and W.H. prepared the paper. X.W., H.S., W.Y., L.S., X.Y., G.Y, Z.Z., M.S., C.L., J.Z. and C.D. were primarily responsible for the experiments. J.Z., X.O., Y.T., Q.C., Y.W. and H.Y. were responsible for the X-ray related experiments. H.W., Q.W. and W.J. performed lifetime and quantum yield measurements. H.M. and X.J. contributed to time-dependent density functional theory calculations calculations. Y(M).Y. conducted photoconductive gain measurements. X.X., J.W., Q.C. and G.Z. gave suggestions of conceptual ideas and language improvements for the manuscript. All authors contributed to the data analyses.
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Supplementary Information
Supplementary Figs. 1–12, Tables 1–5, Equations 1–10, Scheme 1 and references.
Crystallographic Data 1
The crystallographic data of o-ITC.
Crystallographic Data 2
The crystallographic data of m-ITC.
Crystallographic Data 3
The crystallographic data of p-ITC.
Source data
Source Data Fig. 2
Numerical data used to generate Fig. 2.
Source Data Fig. 3
Numerical data used to generate Fig. 3.
Source Data Fig. 4
Numerical data used to generate Fig. 4.
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Wang, X., Shi, H., Ma, H. et al. Organic phosphors with bright triplet excitons for efficient X-ray-excited luminescence. Nat. Photonics 15, 187–192 (2021). https://doi.org/10.1038/s41566-020-00744-0
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DOI: https://doi.org/10.1038/s41566-020-00744-0
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