A novel Mn⁴⁺‐activated far‐red Sr₂MgWO₆ phosphor: synthesis, luminescence enhancement, and application prospect

Abstract

A novel far‐red emitting phosphor Sr2MgWO6: Mn4+ was fabricated using high‐temperature solid‐state reaction. X‐ray diffraction patterns, scanning electron microscopy images, and photoluminescence excitation and photoluminescence spectra for this phosphor were analyzed in detail. The analysis revealed that its emission ranged from 600 to 800 nm and peaked at 699 nm, which was attributed to the 2Eg→4A2g transition of Mn4+ under 314 nm excitation. Moreover, we introduced rare‐earth Yb3+ ions into the Sr2MgWO6:Mn4+ to improve its far‐red emitting intensity. The photoluminescence (PL) intensity of the Yb3+ co‐doped phosphor was three times higher than that of the single‐doped phosphor. Therefore charge compensation is an efficient approach to improving PL intensity. The phosphor emitted a far‐red light that resembled the pigments essential for plant growth in terms of the absorption spectrum. Therefore, the obtained phosphor, Sr2MgWO6:0.006Mn4+,0.2Yb3+, had the potential to be a new type of far‐red luminescent powder for indoor plant growth LEDs.

Effect of A-Cation Radius on the Structure, Luminescence, and Temperature Sensing of Double Perovskites A2MgWO6 Doped with Dy3+ (A = Ca, Sr, Ba)

“…Only the high-temperature solid-state reaction method was used for the syntheses of Ca 2 MgWO 6 , and Sr 2 MgWO 6 . , In this work, the powders of A 2 Mg 1.2–2 x Dy x Li x WO 6 double perovskites (A = Ca, Sr, Ba; x = 0, 0.001, 0.005, 0.01, 0.02, 0.03, 0.05, 0.07) were synthesized by using the coprecipitation method. , To compensate for the evaporation of Mg during high-temperature sintering, a 20% molar excess of Mg­(CH 3 COO) 2 was added to the synthesis. The introduction of Dy 3+ ions to the Mg 2+ site would cause lattice distortion due to the difference in ionic radii and charge mismatch.…”