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- W4387118060 abstract "A series of rare-earth free far-red emitting phosphor NaYBa4W2O12: xMn4+ (0.025 ≤ x ≤ 0.75%, NYBW: Mn4+) is successfully synthesized for application in near-ultraviolet (n-UV) light pumped plant cultivation light-emitting diodes (LEDs). The phase purity, crystal structure, electronic structure and luminescent properties of NYBW: Mn4+ are investigated in detail. The results indicate that all NYBW: Mn4+ phosphors are well crystallized with a direct band gap of 3.86 eV. Broad excitation band can be found with dominant wavelengths at 365 and 520 nm, indicating NYBW: Mn4+ can be efficiently excited by commercial n-UV or green LED chip. Upon 360 nm excitation, NYBW: Mn4+ shows intense broad-band far-red emission centered at 696 nm, attributed to the 2Eg-4A2g transition of Mn4+. The optimal doping concentration of Mn4+ is determined to be 0.1% and the concentration quenching mechanism is the dipole-quadrupole interaction. The decay time decreases from 0.58 to 0.081 ms with Mn4+ concentration increasing from 0.025 to 0.75%. The temperature quenching behaviour of Mn4+ in NYBW is investigated, with a thermal activation energy estimated to be about 0.375 eV. Finally, a far-red emitting LED device is fabricated by coating NYBW: Mn4+ phosphor on a 365 nm n-UV LED chip. The above results guarantee that the as-prepared far-red emitting phosphor NYBW: Mn4+ has great potential for application in indoor plant cultivation LEDs." @default.
- W4387118060 created "2023-09-29" @default.
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- W4387118060 date "2024-01-01" @default.
- W4387118060 modified "2023-10-15" @default.
- W4387118060 title "Rare-earth free far-red emitting perovskite phosphor NaYBa4W2O12:Mn4+ for indoor plant cultivation lighting" @default.
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- W4387118060 doi "https://doi.org/10.1016/j.jlumin.2023.120225" @default.
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