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<p>Lead-free halide double perovskites (LFHDPs) have gained prominence as eco-friendly optoelectronic materials due to their structural stability and flexible tunability. Lanthanide (Ln<sup>3+</sup>) ions have rich energy levels, which can endow LFHDP materials with emissions ranging from visible to near-infrared (NIR) region through the ion doping strategy. However, their NIR applications remain limited by narrowband emission and low photoluminescence quantum yield (PLQY) due to weak absorption cross-section. Herein, Cs<sub>2</sub>NaInCl<sub>6</sub>:Ln<sup>3+</sup> were successfully synthesized, and the problem of low absorption of Ln<sup>3+</sup> ions is effectively solved. Incorporating Mo<sup>4+</sup>/Ag<sup>+</sup> ions achieves a near-unity PLQY and expands the excitation spectrum across the full visible range and a small part of NIR region (250–850 nm). Mechanism analysis revealed synergistic energy transfer pathways involving self-trapping excitons and intermediate energy states of Mo<sup>4+</sup> ion, enhancing both photon absorption and PLQY. The universal applicability of this approach has been validated across Bi-based and multiple lanthanide ions (Ln: Ho, Er, Tm, Yb). These optimized materials demonstrate exceptional broadband emission characteristics suitable for multi-scenario NIR applications, including light-emitting-diodes (LEDs), night vision, imaging, anti-counterfeiting technologies. This co-doping methodology establishes a versatile framework for overcoming inherent limitations in Ln<sup>3+</sup>-activated materials, offering new possibilities for efficient NIR optoelectronic devices.</p>

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Sensitizing effect of lanthanide luminescence by Mo4+/Ag+ in double perovskites: great enhancement of near-infrared emission via wide range of excitation (250–850 nm)

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月26日

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  • Yingsheng Wang,
  • Peipei Dang,
  • Zixun Zeng,
  • Dongjie Liu,
  • Guodong Zhang,
  • Long Tian,
  • Kai Li,
  • Ping’an Ma,
  • Yi Wei,
  • Hongzhou Lian,
  • Zhiyao Hou,
  • Guogang Li,
  • Jun Lin

摘要

Lead-free halide double perovskites (LFHDPs) have gained prominence as eco-friendly optoelectronic materials due to their structural stability and flexible tunability. Lanthanide (Ln3+) ions have rich energy levels, which can endow LFHDP materials with emissions ranging from visible to near-infrared (NIR) region through the ion doping strategy. However, their NIR applications remain limited by narrowband emission and low photoluminescence quantum yield (PLQY) due to weak absorption cross-section. Herein, Cs2NaInCl6:Ln3+ were successfully synthesized, and the problem of low absorption of Ln3+ ions is effectively solved. Incorporating Mo4+/Ag+ ions achieves a near-unity PLQY and expands the excitation spectrum across the full visible range and a small part of NIR region (250–850 nm). Mechanism analysis revealed synergistic energy transfer pathways involving self-trapping excitons and intermediate energy states of Mo4+ ion, enhancing both photon absorption and PLQY. The universal applicability of this approach has been validated across Bi-based and multiple lanthanide ions (Ln: Ho, Er, Tm, Yb). These optimized materials demonstrate exceptional broadband emission characteristics suitable for multi-scenario NIR applications, including light-emitting-diodes (LEDs), night vision, imaging, anti-counterfeiting technologies. This co-doping methodology establishes a versatile framework for overcoming inherent limitations in Ln3+-activated materials, offering new possibilities for efficient NIR optoelectronic devices.