|Cite this article as:|
|Fangyi Zhao, Zhen Song, and Quanlin Liu, Novel Cr3+-activated far-red emitting phosphors with β-Ca3(PO4)2-type structure for indoor plant cultivation, Int. J. Miner. Metall. Mater.,(2021). https://doi.org/10.1007/s12613-021-2363-6|
Cr3+-activated far-red and near-infrared phosphors have drawn much attention owing to their adjustable emission wavelengths and wide applications. Herein, we report a series of Cr3+-doped phosphors with β-Ca3(PO4)2-type structure, of which Ca9Ga(PO4)7:Cr3+ possesses the highest far-red emission intensity due to its strong absorption band of Cr3+ ion. Under the excitation of 440 nm, Ca9Ga(PO4)7:Cr3+ phosphors exhibit a broad emission band ranging from 650 to 850 nm peaking at 735 nm and superimpose two sharp lines centered at 690 and 698 nm. The optimal sample, Ca9Ga0.97(PO4)7:0.03Cr3+, has the internal quantum efficiency of 55.7%. The luminescence intensity of Ca9Ga0.97(PO4)7:0.03Cr3+ phosphor obtained at 423 K can maintain 68.5% of that at room temperature, demonstrating its outstanding luminescence thermal stability. Finally, a phosphor-conversion light-emitting diode was fabricated, indicating that Ca9Ga(PO4)7:Cr3+ phosphor has potential applications in the field of indoor plant cultivation.