Hydrothermal Synthesis and Luminescence of Eu-Doped Ba_0.92Y_2.15F_8.29 Submicrospheres

Abstract

The nonstoichimetric Ba0.92Y2.15F8.29 submicrospheres that piled up by nanoparticles have been prepared via a solution-based method in a hydrothermal environment. The size distribution of the submicrospheres could be tuned by varying the amount of BaCl2. The fluoride source NaBF4 plays an important role in the formation of the submicrospheres. The chelator ethylenediaminetetraacetic acid regulates the growth of the primary nanoparticles as well as the aggregated submicrospheres. The photoluminescence properties of different concentrations of Eu3+-doped Ba0.92Y2.15F8.29 were investigated and the results revealed that the 8% concentration of Eu3+ ions is the optimum doping concentration and the Y3+ ions occupy the site of inversion symmetry.

Large-scale synthesis of Lu2O3:Ln3+ (Ln3+=Eu3+, Tb3+, Yb3+/Er3+, Yb3+/Tm3+, and Yb3+/Ho3+) microspheres and their photoluminescence properties

“…Ln 3+ -doped Lu 2 O 3 materials (Ln 3+ = Eu, Tb, Er, Ho, Sm) are important phosphors as reported in previous studies [33][34][35][36][37][38][39]. So far, various traditional synthesis methods have been used to prepare Lu 2 O 3 and Ln 3+ -doped Lu 2 O 3 materials, such as a combustion process using urea, glycine, and citric acid as fuel [33][34][35][36], a coprecipitation method [37,38], the Pechini sol-gel procedure [39], and hydrothermal methods [40,41]. These synthesis techniques are well-known and routinely used for fabrication of oxide phosphors.…”

“…Also, the uniform spherical nanoparticles which present lower surface defects are preferred for improving optical properties [42]. However, research on Lu 2 O 3 phosphors has mainly been focused on Eu 3+ doped one-dimensional nanostructures, such as nanorods and nanofibers [40]. There In this work, multicolor and monodisperse Lu 2 O 3 :Ln 3+ (Ln 3+ = Eu 3+ , Tb 3+ , Yb 3+ /Er 3+ , Yb 3+ /Tm 3+ , and Yb 3+ / Ho 3+ ) microspheres were prepared by a homogeneous precipitation method followed by a subsequent calcination process.…”

Controllable synthesis, shape evolution, and luminescence properties of uniform and well-dispersed NaEuF4 microcrystals through hydrothermal route

“…Many synthetic methodologies including hydro-/solvothermal method [2], solgel process [3], solution combustion synthesis [4], microemulsion [5], coprecipitation reaction [6] have been explored widely for the synthesis of a large range of nanostructures. Among these fabrications, the hydrothermal route has been proved to be one of the most effective and convenient approaches in preparing various inorganic materials with high crystallinity and diverse controllable morphologies due to its gentle synthetic conditions, ease of operation, precise manipulation, and tunable reaction parameters [7][8][9][10][11][12][13]. Furthermore, the shape and phase of the final product are determined by the selection of appropriate organic additives and synthetic conditions, such as the contents of organic additives, pH value of the initial solution and reaction time during the hydrothermal process [14][15][16].…”

Size and shape controllable synthesis of oil-dispersible BaYF5:Yb3+/Er3+ upconversion fluorescent nanocrystals

“…Among UC nanomaterials, fluoride nanocrystals, such as LaF 3 , YF 3 , NaYF 4 have attracted considerable attention [3][4][5]. Compared with the fluorides mentioned above, alkaline-earth lanthanide ternary fluorides have obtained relatively little attention, although barium yttrium fluoride crystals, such as BaYF 5 , are excellent host materials that can be doped with divalent and trivalent lanthanide ions, which also exhibit the strong broadband emission in the near UV spectra region (360-440 nm) [6] and highly efficient infraredto-visible up-conversion light [7]. The related investigations are mainly dominated on the bulk and micro-structure.…”

“…Furthermore, Shan et al prepared Yb 3+ /Ho 3+ co-doped with ions transparent SiO 2 -Al 2 O 3 -BaCO 3 -YF 3 -BaF 2 glass ceramics [8], however, the processes have several disadvantages such as complex experimental setups, higher operating temperature and irregular morphology. Huang et al synthesized Eu 3+ -doped Ba 0.92 Y 2.15 F 8.29 submicrospheres without considering the relationship between the size and morphology of products and the optical properties [6]. However, the synthesis of BaYF 5 UC materials has rarely been studied at the nanoscale.…”