Uniform Lu₂O₃hollow microspheres: template-directed synthesis and bright white up-conversion luminescence properties

Monodisperse and hollow structured Y 2 O 3 :Ln 3+ (Ln = Eu, Dy, Er, Tm) nanospheres: A facile synthesis and multicolor-tunable luminescence properties

“…In particular, the Ln 3+ doped hollow down-conversion (DC) and up-conversion (UC) spheres should be applied in drug and enzyme delivery, and specific phosphor powder due to their distinct photophysical properties and structural characteristics [6,16,17]. Among them, Y 2 O 3 is a promising host matrix for DC [18] and UC [19] luminescence because of its good chemical durability, thermal stability, and low phonon energy.…”

“…Therefore, many efforts have been made in the development of different methods for the design and fabrication of nano-/microscaled hollow spheres. Template-directed synthesis, with hard templates (including polymer latex particles, carbon spheres, silica spheres, and metal nanoparticles) [6][7][8][9], and soft templates (consisting of vesicles, emulsion droplets, and gas bubbles) [10][11][12] have been demonstrated to be an effective approach to prepare inorganic hollow spheres. Among various hard templates, polymer latex particles, especially novel PAAS spheres, have been rarely reported to be effective templates for the preparation of hollow spherical inorganic materials.…”

Large-scale fabrication of porous YBO 3 hollow microspheres with tunable photoluminescence

“…Among all these commonly used strategies, hard templating method is an established, industrially relevant, simple and scalable protocol to produce hollow materials [32]. Basically, the preparation of hollow structures using hard templating method consists typically of three steps: (i) template preparation, (ii) coating of the template and (iii) removal of the template [33][34][35]. Although there are a lot of reports on hard templating synthesis of hollow structures, including C 3 N 4 [36], Ta 3 N 5 [37], TiO 2 [38], ZnO [39], BiMoO 6 [40] and LaTiO 2 N [41], reports on YBO 3 hollow structure are very rare.…”

Red, White and Blue Light Emission from Europium Doped Al2O3 Confined into a Silica Matrix

“…It is well known that rare-earth elements such as erbium, terbium, europium, cerium, and ytterbium are the most important activator centers of luminescence [1] [2], and this has given great impetus to the study of a variety of luminescent materials using a host crystal lattice: oxides, sulfides, selenides, and titanates doped with rare-earth ions for a broad application, such as in lasers, ceramics, sensors, lighting, displaying, and heat-resistant materials [3] [4] [5] [6] [7]. The most important reason for using rare-earth ions as activator centers in matrices is undoubtedly their narrow band of emission and absorption, which is due to 4f→4f electronic transitions [8].…”