| Autor: |
Xue Zhao, Pengfei Fu, Pan Li, Hainan Du, Jinsong Zhu, Ciyu Ge, Longbo Yang, Boxiang Song, Haodi Wu, Tong Jin, Qingxun Guo, Liang Wang, Jinghui Li, Zewen Xiao, Jingjing Chang, Guangda Niu, Jiajun Luo, Jiang Tang |
| Jazyk: |
angličtina |
| Rok vydání: |
2023 |
| Předmět: |
|
| Zdroj: |
Research, Vol 6 (2023) |
| Druh dokumentu: |
article |
| ISSN: |
2639-5274 |
| DOI: |
10.34133/research.0125 |
| Popis: |
Lead halide perovskite nanocrystals have recently demonstrated great potential as x-ray scintillators, yet they still suffer toxicity issues, inferior light yield (LY) caused by severe self-absorption. Nontoxic bivalent europium ions (Eu2+) with intrinsically efficient and self-absorption-free d–f transition are a prospective replacement for the toxic Pb2+. Here, we demonstrated solution-processed organic–inorganic hybrid halide BA10EuI12 (BA denotes C4H9NH4+) single crystals for the first time. BA10EuI12 was crystallized in a monoclinic space group of P21/c, with photoactive sites of [EuI6]4− octahedra isolated by BA+ cations, which exhibited high photoluminescence quantum yield of 72.5% and large Stokes shift of 97 nm. These properties enable an appreciable LY value of 79.6% of LYSO (equivalent to ~27,000 photons per MeV) for BA10EuI12. Moreover, BA10EuI12 shows a short excited-state lifetime (151 ns) due to the parity-allowed d–f transition, which boosts the potential of BA10EuI12 for use in real-time dynamic imaging and computer tomography applications. In addition, BA10EuI12 demonstrates a decent linear scintillation response ranging from 9.21 μGyair s−1 to 145 μGyair s−1 and a detection limit as low as 5.83 nGyair s−1. The x-ray imaging measurement was performed using BA10EuI12 polystyrene (PS) composite film as a scintillation screen, which exhibited clear images of objects under x-ray irradiation. The spatial resolution was determined to be 8.95 lp mm−1 at modulation transfer function = 0.2 for BA10EuI12/PS composite scintillation screen. We anticipate that this work will stimulate the exploration of d–f transition lanthanide metal halides for sensitive x-ray scintillators. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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