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

Abstract

Your article is protected by copyright and all rights are held exclusively by Akadémiai Kiadó, Budapest, Hungary. This e-offprint is for personal use only and shall not be selfarchived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com".Abstract Mn 4? doped and Dy 3? , Tm 3? co-doped MgAl 2 Si 2 O 8 -based phosphors were prepared by conventional solid state reaction at 1,300°C. They were characterized by thermogravimetry, differential thermal analysis, X-ray powder diffraction, photoluminescence, and scanning electron microscopy. The luminescence mechanism of the phosphors, which showed broad red emission bands in the range of 600-715 nm and had a different maximum intensity when activated by UV illumination, was discussed. Such a red emission can be attributed to the 2 E ? 4 A 2 transitions of Mn 4? .

Investigation of the effect of ytterbium doping on photoluminescence and photocatalytic activity of Li4Ti5O12

“…This can be explained by the creation of abundant oxygen gaps and surface defects with Yb 3+ doping, which improves electron capture and electron‐hole separation processes. Besides Yb 3+ , the half‐filled f orbital configuration can be considered as one of the possible reasons for the increase in photocatalytic activity 48,28,49 …”

“…Besides Yb 3+ , the half-filled f orbital configuration can be considered as one of the possible reasons for the increase in photocatalytic activity. 48,28,49 In order to determine the photocatalyst performance of the Yb-doped LTO material, the kinetics of the photocat-alytic degradation reaction was also investigated. For this, the photocatalytic activity was evaluated by change in the C/C 0 ratio, where C is the concentration of methylene blue after degradation and C 0 is the initial concentration of methylene blue.…”

Synthesis, structure, and thermal stability of new scheelite-type Pb1−3x□xPr2x(MoO4)1−3x(WO4)3x ceramic materials

“…Lead molybdate was prepared by heating PbO with MoO 3 (both with the purity 99.95 %, Alfa Aesar) mixed in an equimolar ratio, and in the following thermal conditions: 550°C (6 h), 600°C (6 h), 700°C (6 h), 800°C (12 h), 900°C (12 h), and 950°C (12 h). Praseodymium tungstate was obtained using a solid-state reaction method [37][38][39][40][41][42][43][44][45] and Pr 6 O 11 with WO 3 (both with the purity 99.95 %, Alfa Aesar) mixed in the 1:9 molar ratio according to the procedure used by us in a synthesis of other rare-earth tungstates, and under thermal conditions reported earlier [25][26][27][28][37][38][39]. Mixtures of starting reactants with Pr 2 (WO 4 ) 3 content changing from 0.50 to 50.00 mol% were homogenized in an agate mortar.…”