Abstract
A novel far-red emitting phosphor Na0.2La0.2Sr1.6MgWO6: Mn4+ can be fabricated by high-temperature solid-state reaction. Photoluminescence excitation and photoluminescence spectra of this phosphor were analyzed in detail. Effective far-red light peaking at 691 nm was observed when the phosphors were excited by 350 nm or 467 nm. By using a [Na+-La3+] unit substituting [Sr2+-Sr2+] unit partially, the far-red emission intensity of Sr2MgWO6:0.006Mn4+ can be improved about 60.5 times. Moreover, it exhibited a high thermal stability; the value of I373K/I298K was approximately 46.59% of that at room temperature. Finally, there are a broad spectral overlap between the emission band of Na0.2La0.2Sr1.6MgWO6: Mn4+ phosphors and the absorption band of phytochrome PFR under near-ultraviolet light spectrum. Therefore, the obtained phosphors Na0.2La0.2Sr1.6MgWO6: Mn4+ have potential to be a new type far-red luminescent powder for indoor plant growth LEDs.
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