Structural, electronic and optical characterization of Eu ^₃+/Dy ^₃+ single and co-doped Mg₂P₂O₇ phosphors

Abstract

Eu3+/ Dy3+ single and co-doped magnesium pyrophosphate phosphors were synthesized via solution combustion route. The resulted phosphor has a monoclinic crystal structure with space group B21/c. The lattice parameter of the sample is refined using ‘Full Prof software’. x-ray photoemission spectroscopy (XPS) result reveals that dysprosium and europium present in a trivalent valence state. Valence band spectra (VBS) result indicates that 6 features present in a single doped sample and 8 features present in a co-doped sample. The photoluminescence studies reveal that the combination of Eu3+ and Dy3+ emissions give tuneable emission from red to pink to yellowish-white under UV excitation. The energy transfer mechanism from Dy3+ to Eu3+ is confirmed from photoluminescence spectra and life time curves. The optical band gap of the prepared samples is obtained to be in the range of 5.02–5.40 eV. The synthesized material has conventional application in solid-state lighting under UV-excitation.

A Static Tin–Manganese Battery with 30000-Cycle Lifespan Based on Stabilized Mn3+/Mn2+ Redox Chemistry

“…Energy-dispersive X-ray spectroscopy (Figure H) manifests the uniform distribution of Sn, P, and O elements, further proving the composition. XPS study also exhibits the presence of Sn, P, and O (Figure S26a), in which Sn appears as Sn 4+ (Figure I). , High-resolution P 2p and O 1s spectra (Figure S26b,c) also confirm the appearance of P 2 O 7 4– ions in the protective layer. , Based on the above analyses and discussion, the protective layer formation process can be illustrated in Figure J. Sn 2+ was first oxidized to Sn 4+ by Mn 3+ around the electrode surface, after which the protective layer was in situ formed through the precipitation between Sn 4+ and P 2 O 7 4– .…”

Electrochemical surface reconstruction of nickel cobalt pyrophosphate to Ni/Co-hydroxide-(oxy)hydroxide: an efficient and highly durable battery-type supercapacitor electrode material

“…1f). 52 These aforementioned studies conrm the formation of bimetallic nickel cobalt pyrophosphate.…”