Abstract
A series of UV-light excited Ba2YSbO6: xMn4+(BYSO: xMn4+) phosphors exhibiting red emission peaked at 690 nm were successfully synthesized by high temperature solid-state reaction. The lattice occupation of ions had been revealed, and the band gap and the electronic structure of Ba2YSbO6 was analyzed in detail based on the first-principles theory calculation. After introducing the Al3+ ions, the red emission intensity of BYSO: Mn4+ could be increased by 3.5 times and the thermal stability is also sharply enhanced from 60% to 81% at 423 K. Finally, a red LED device was fabricated by combining the BYSO: 0.6%Mn4+, 1.6%Al3+ phosphor with a 365 nm n-UV chip, whose emission spectrum possesses a large overlap with the absorption band of the phytochrome (PFR) and its color purity reaches as high as 98.7%. These results suggest that the optimized BYSO:0.6%Mn4+, 1.6%Al3+ phosphor has great application potential in horticultural LEDs.
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