Red phosphors in MgAl2Si2O8 doping with Mn4+, Gd3+ and Lu3+ and host-sensitized luminescence properties

Abstract

Mn4+ doped and Gd3+, Lu3+ co-doped MgAl2\ud Si2O8-based phosphors were first of all synthesized by solid\ud state reaction at about 1300.0 C. They were characterized\ud by thermogravimetry, differential thermal analysis, X-ray\ud powder diffraction, photoluminescence, and scanning electron\ud microscopy. The luminescence mechanism of the\ud phosphors which showed broad red emission bands in the\ud range of 610–715 nm and had a different maximum intensity\ud when activated by UV illumination was discussed. Such a\ud red emission can be attributed to the intrinsic 2E+ 4A2\ud transitions of Mn4

Fabrication of MgAl2Si2O8 : M0.01 (M = Ni2+, Cu2+, Pd2+, Pt2+ and Ru3+): catalytic effects for the reduction of 2- or 4-nitroanilines in water

“…were prepared in accordance with the published procedure. [10][11][12][13] All the prepared materials were characterized by XRD analysis, FT-IR, TG/DTA, SEM, EDX and nitrogen adsorption-desorption (BET) analysis. Moreover, the materials were used as catalysts in the reduction of nitroanilines.…”

“…Lastly, the materials were sintered at 1300 • Cfor3h. [10][11][12][13] After these steps, the substances were obtained and all the compounds were examined with XRD analysis using a Bruker AXS D8 Advance diffractometer which was run at 20-60 kV and 6-80 mA, 2θ = 10-90 • and a step of 0.002 • usingCuK α X-ray. The SEM images and EDX analysis were performed on a LEO 440 model scanning electron microscope using an accelerating voltage of 20 kV.…”

“…Aluminosilicates materials can be used for the simple impregnation process, whereby combined materials can be synthesized and used as a long lasting catalyst. [10][11][12][13][14][15][16][17] Furthermore, materials including nickel, copper, platinum, palladium and ruthenium have also been used as catalysts for the transfer of hydrogenation of ketones, hydrogenation of aldehyde, hydrosilylation of alkynes, methanol decomposition, Suzuki-Miyaura cross-coupling reaction, solvent-free oxidation of aromatic alcohols, etc. [18][19][20][21][22][23] Nitroarenes are a widely organic pollutant in waste water.…”

Novel red-emitting phosphor Li2MgZrO4:Mn4+,Ga3+ for warm white LEDs based on blue-emitting chip

“…22,23 In contrast, Mn 4+ activated oxides exhibiting much high chemical stability with an eco-friendly preparation procedure, show promising capabilities as good red converters for warm W-LEDs. [26][27][28] Mn 4+ activated aluminates, 29,30 titanates, 31,32 germanates 33 and pyrosilicates [34][35][36][37][38] has been widely reported. Unfortunately, the currently known Mn 4+ activated oxide phosphors cannot meet the needs of general lighting due to the low quantum efficiency (QE) when excited by blue chips.…”

Novel red-emitting phosphors, (Mg(1−x−y)MnxDyy)Al2Si2O8 and (Mg(1−x−y)MnxTmy)Al2Si2O8

“…The luminescence of rare-earth ions in the silicate host has been studied for a long time. In recent years, silicate phosphors have been reported by researchers [4][5][6][7][8][9][10][11][12][13].…”