New Mixed Y0.5R0.5VO4 and RVO4:Bi Materials: Synthesis, Crystal Structure and Some Luminescence Properties

Abstract

The results are reported on a precise crystal structure and microstructure determination of new mixed YVO4-based orthovanadates of Y0.5R0.5VO4 (R = Sm, Tb, Dy, Ho, Tm, Yb, Lu) as well as some Bi3+-doped RVO4 (R = La, Gd, Y, Lu) nano- (submicro-) materials. The formation of continuous solid solutions in the YVO4–RVO4 pseudo-binary systems (R = Sm, Tb, Dy, Ho, Tm, Yb, Lu) has been proved. The lattice constants and unit cell volumes of the new mixed orthovanadates were analyzed as a function of R3+ cation radius. The impact of crystal structure parameters on the energy band gap of the materials was studied by means of photoluminescence studies of the Bi3+-doped compounds.

The Use of Diatoms in the Synthesis of New 3D Micro-Nanostructured Composites (SiO2/CaCO3/Corg/NdVO4NPs and SiO2/CaO/Corg/NdVO4NPs) Exhibiting an Intense Anti-Stokes Photoluminescence

“…When excited in the near-infrared (λ ex = 800 nm), the resulting composites show four anti-Stokes emission bands in the visible region, as shown in the emission spectrum in Figure 6. The emission in the ultraviolet region (~261 nm) is most likely the result of an electronic transition in VO 4 3− , which corresponds to the transition of electrons from the V 3d and O 2p bonding states to the non-bonding states [9,34]. Green, orange, and red light emissions are mainly due to electron transitions in Nd 3+ [28].…”

Evaluation of Li2SnO3:Cr3+, Mn4+ as a dual-emitter luminescence sensor for cryogenic temperatures

“…It is pertinent to remark that incorporation of TM ions at different crystallographic sites is a common feature observed in complex oxides. [26][27][28] The observed temperature dependencies offer insight into the dynamics governing the population of excited states within the emission centres under consideration. To attain a more comprehensive understanding of this behaviour, we examined the normalized intensity of various emissions, presented as a function of temperature (see Fig.…”

“…The change of decay time constant of the R-lines is yet another feature of emission of TM ions that is regularly applied for temperature monitoring. 26,[37][38][39] To verify the merit of these characteristics we measured the variation of luminescence decay time constants of the R-lines in Li 2 SnO 3 . Fig.…”

Morphology of the GdVO4crystal: first-principles studies

“…Therefore, GdVO 4 could be used as a laser, phosphor or up-convertor (Cho, 2013;Yu et al, 2013;Yan & Gu, 2009;Shanta Singh et al, 2012;Tang et al, 2012;Cante et al, 2018;Shimamura et al, 1996;Rabasovic et al, 2018;Qiao et al, 2017;Min & Jung, 2019;Jovanović et al, 2018;Zheng et al, 2011;Gavrilović et al, 2016). The Bi 3+ -doped GdVO 4 crystal is also of great importance in modern electronics because of unique luminescent characteristics that can be applied in white light emitting diodes (Vasylechko et al, 2018;Krasnikov et al, 2019). In addition, recent efforts show important implications of GdVO 4 for photocatalytic reactions since it possesses a strong ability to generate hydrogen from water or water/alcohol ISSN 2052-5206 # 2020 International Union of Crystallography solutions (Oshikiri et al, 2014a,b;Mazierski et al, 2019).…”