Abstract
In this work, we synthesized a series of Gd2SrAl2O7: Mn4+/Bi3+/Na+ phosphors by sol-gel method. The experimental results show that there is energy transfer from Bi3+ to Mn4+. By introducing Bi3+ and Na+ ions into the host, emission intensity of the optimal phosphor can be increased to 2.5 times that of Gd2SrAl2O7: Mn4+ and its internal quantum yield is as high as 79.9%. Furthermore, the optimal phosphor also exhibits satisfactory luminescence thermal stability, whose PL intensity at 423 K retained 80.2% of that at room temperature and the activation energy reaches up to 0.45 eV. Mechanism of photoluminescence improvement can be attributed to efficient energy transfer, charge compensation and enhanced crystal rigidity. Packaged LED device exhibits dazzle far red light and its PL spectrum widely overlaps with the absorption band of phytochrome PFR. The performance indexes support the prospective application of the optimal phosphor in plant growth lighting.
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