Publication date: 17th July 2025
Broadband near-infrared (NIR) emitting phosphors have attracted considerable attention in food, bioimaging, night vision, and plant lighting. However, NIR phosphors targeting the absorption of far-red/phytochrome (PFR) have rarely been reported. We note that gallium garnets are more suitable for satisfying the photomorphogenesis needs of plants. Accordingly, we have designed a Cr3+-doped Gd2.4Lu0.6Ga4AlO12 NIR phosphor from original Gd3Ga5O12:Cr3+ by substituting the large Gd3+ and Ga3+ ions with small Lu3+ and Al3+ ions to regulate relative energies and sequence of the two lowest excited states 2Eg and 4T2g. The optimal Gd2.4Lu0.6Ga3.87AlO12:0.13Cr3+ sample exhibits greater spectral overlap with the absorption of PFR, originated from the raised peak emissions and the blue-shift of emission band. Meanwhile, the luminescence is greatly enhanced by 2 times when the flux of H3BO3 was added during the synthesis. Thanks to the excellent EQE and low thermal quenching behavior, a NIR pc-LED was fabricated by integrating the Gd2.4Lu0.6Ga3.87AlO12:0.13Cr3+,3 wt%H3BO3 on a blue chip-on-board chip, which has a high output power of 505.99 mW and photoelectric efficiency of 11.24% at 300 mA. To further evaluate the potential of this device for plant growth, pea seedlings (Pisum sativum L.) as the model was investigated. The difference is achieved the 79.84% and 67.72% in dry and fresh weight under different treatments. This study provides a reference to regulate the spectral profile of Cr3+-doped NIR phosphors and sheds light on the practical application of Cr3+-doped NIR phosphors in the field of plant lighting.
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