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<p>Near-infrared (NIR) spectroscopy has significantly advanced NIR light sources. However, creating NIR emitters with optimal luminescence properties, high thermal stability, and adjustable emission peaks poses a critical challenge for future smart NIR devices. We introduced a chemical unit cosubstitution strategy by incorporating Ca<sup>2+</sup> and Sn<sup>4+</sup> ions into the garnet structure. Through this approach, Y<sub>3−<i>y</i></sub>Ca<sub><i>y</i></sub>Ga<sub>4.95−<i>y</i></sub>Sn<sub><i>y</i></sub>G<sub>12</sub>:0.05Cr<sup>3+</sup> (<i>y</i> = 0–1) phosphors were developed by modulating the A&amp;C ligands, resulting in emission centers ranging from 708 to 768 nm. The modified local environment of Cr<sup>3+</sup> accounts for the increased light intensity (2.71 times) and broadening observed. Furthermore, this study investigated the impact of varying Cr<sup>3+</sup> concentrations (Y<sub>2.6</sub>Ca<sub>0.4</sub>Ga<sub>4.6−<i>x</i></sub>Sn<sub>0.4</sub>G<sub>12</sub>:<i>x</i>Cr<sup>3+</sup>) on the production of high-performance phosphors. Compared with Y<sub>3</sub>Ga<sub>4.93</sub>G<sub>12</sub>:0.07Cr<sup>3+</sup>, the optimized phosphor exhibited exceptional external quantum efficiency (EQE = 34.96%). The luminescence enhancement is attributed to an increase in radiative transitions caused by octahedral Jahn-Teller distortion, whereas the notable thermal stability (91.3% at 423 K) is attributed to the presence of weak electron-phonon coupling (EPC) and oxygen vacancy (O<sub>V</sub>) defects. Finally, by combining it with a 450 nm blue LED chip, we constructed a near-infrared phosphor-converted LED (NIR pc-LED) device with superior electroluminescence efficiency (18.8% @ 100 mA), increasing the ultralow quenching rate (&lt; 5% intensity loss after 30 days of operation) and demonstrating remarkable performance in plant lighting applications.</p>

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Achieving high-performance near-infrared Cr3+-activated phosphor via A&C lattice sites cosubstitution strategy in garnet for plant lighting

  • 期刊论文

  • 发表日期：

    2025年12月4日

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  • Chunli Peng,
  • Baoling Tang,
  • Xuejie Zhang,
  • Maxim S. Molokeev,
  • Haoran Zhang,
  • Bingfu Lei

摘要

Near-infrared (NIR) spectroscopy has significantly advanced NIR light sources. However, creating NIR emitters with optimal luminescence properties, high thermal stability, and adjustable emission peaks poses a critical challenge for future smart NIR devices. We introduced a chemical unit cosubstitution strategy by incorporating Ca2+ and Sn4+ ions into the garnet structure. Through this approach, Y3−yCayGa4.95−ySnyG12:0.05Cr3+ (y = 0–1) phosphors were developed by modulating the A&C ligands, resulting in emission centers ranging from 708 to 768 nm. The modified local environment of Cr3+ accounts for the increased light intensity (2.71 times) and broadening observed. Furthermore, this study investigated the impact of varying Cr3+ concentrations (Y2.6Ca0.4Ga4.6−xSn0.4G12:xCr3+) on the production of high-performance phosphors. Compared with Y3Ga4.93G12:0.07Cr3+, the optimized phosphor exhibited exceptional external quantum efficiency (EQE = 34.96%). The luminescence enhancement is attributed to an increase in radiative transitions caused by octahedral Jahn-Teller distortion, whereas the notable thermal stability (91.3% at 423 K) is attributed to the presence of weak electron-phonon coupling (EPC) and oxygen vacancy (OV) defects. Finally, by combining it with a 450 nm blue LED chip, we constructed a near-infrared phosphor-converted LED (NIR pc-LED) device with superior electroluminescence efficiency (18.8% @ 100 mA), increasing the ultralow quenching rate (< 5% intensity loss after 30 days of operation) and demonstrating remarkable performance in plant lighting applications.