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<p>Recently, lead-free double perovskites have garnered significant attention for their tunable optical properties, excellent stability, and non-toxic characteristics. However, achieving efficient ultrabroadband near-infrared (NIR) emission and X-ray radioluminescence (RL) simultaneously in double perovskites is a great challenge. To address this issue, we synthesized a Mo<sup>4+</sup>-doped Cs<sub>2</sub>(Na<sub>0.4</sub>Ag<sub>0.6</sub>)InCl<sub>6</sub> double perovskite that exhibits efficient blue-light-excitable NIR emission with a near-unity luminous photoluminescence quantum yield. Notably, the NIR emitter demonstrates robust thermal stability and retains 84% of its initial emission intensity at 420 K compared to 300 K. Moreover, the Mo<sup>4+</sup>-doped Cs<sub>2</sub>(Na<sub>0.4</sub>Ag<sub>0.6</sub>)InCl<sub>6</sub> exhibits bright NIR RL, achieving a high light yield of 39,400 ± 1100 photons/MeV under X-ray irradiation. Based on a flexible film of Mo<sup>4+</sup>-doped Cs<sub>2</sub>(Na<sub>0.4</sub>Ag<sub>0.6</sub>)InCl<sub>6</sub>/polydimethylsiloxane (PDMS), we demonstrated its applications in an NIR light source and an X-ray scintillator, respectively. Furthermore, a dual-functional platform for cooperative NIR and X-ray imaging was established with a bullfrog palm as the target object. This system achieves pixel-level fusion of the NIR and X-ray images without spatial mismatch or complex image processing. The resulting fused image simultaneously visualizes both the blood vessels and skeleton textures under the skin tissue of the bullfrog palm. Therefore, this work provides a viable strategy for the application of lead-free double perovskites in advanced optoelectronic devices.</p>

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Efficient blue-light-excitable broadband NIR emission in Mo4+-doped double perovskite with robust thermal stability and efficient X-ray scintillation for pixel-level X-ray to NIR image fusion

  • 期刊论文

  • 发表日期：

    2026年3月19日

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  • Wenjie Huang,
  • Hui Peng,
  • Fei Wang,
  • Wei Tian,
  • Shengji Yuan,
  • Xiaokang Li,
  • Zhentao Du,
  • Wenchao Yang,
  • Bingsuo Zou

摘要

Recently, lead-free double perovskites have garnered significant attention for their tunable optical properties, excellent stability, and non-toxic characteristics. However, achieving efficient ultrabroadband near-infrared (NIR) emission and X-ray radioluminescence (RL) simultaneously in double perovskites is a great challenge. To address this issue, we synthesized a Mo4+-doped Cs2(Na0.4Ag0.6)InCl6 double perovskite that exhibits efficient blue-light-excitable NIR emission with a near-unity luminous photoluminescence quantum yield. Notably, the NIR emitter demonstrates robust thermal stability and retains 84% of its initial emission intensity at 420 K compared to 300 K. Moreover, the Mo4+-doped Cs2(Na0.4Ag0.6)InCl6 exhibits bright NIR RL, achieving a high light yield of 39,400 ± 1100 photons/MeV under X-ray irradiation. Based on a flexible film of Mo4+-doped Cs2(Na0.4Ag0.6)InCl6/polydimethylsiloxane (PDMS), we demonstrated its applications in an NIR light source and an X-ray scintillator, respectively. Furthermore, a dual-functional platform for cooperative NIR and X-ray imaging was established with a bullfrog palm as the target object. This system achieves pixel-level fusion of the NIR and X-ray images without spatial mismatch or complex image processing. The resulting fused image simultaneously visualizes both the blood vessels and skeleton textures under the skin tissue of the bullfrog palm. Therefore, this work provides a viable strategy for the application of lead-free double perovskites in advanced optoelectronic devices.