Effect of Ceramic Formation on the Emission of Eu3+ and Nd3+ Ions in Double Perovskites

Abstract

Herein, the structure, morphology, as well as optical properties of the powder and ceramic samples of Ba2MgWO6 are presented. Powder samples were obtained by high temperature solid-state reaction, while, for the ceramics, the SPS technique under 50-MPa pressure was applied. The morphology of the investigated samples showed some agglomeration and grains with a submicron size of 490–492 µm. The theoretical density and relative density of ceramics were calculated using the Archimedes method. The influence of sample preparation on the position, shape, and character of the host, as well as dopants emission was investigated. Sample sintering enhances regular emission of WO6 groups causing a blue shift of Ba2MgWO6 emission. Nonetheless, under X-ray excitation, only the green emission of inversion WO6 group was detected. For the ceramic doped with Eu3+ ions, the emission of both host and dopant was detected. However, for the powder efficient host to activator energy, the transfer process occurred, and only the magnetic dipole emission of Eu3+ was detected. The intensity of Nd3+ ions of Ba2MgWO6 powder sample is five times higher than for the ceramic. The sintering process reduces inversion defects and creates a highly symmetrical site of neodymium ions. The emission of Ba2MgWO6:Nd3+ consists of transitions from the 4F3/2 excited level to the 4IJ multiplet states with the dominance of the 4F3/2→4I11/2 one. The spectroscopic quality parameter and branching ratio of Nd3+ emission are presented.

Synthesis and Characterization of Li2MgGeO4:Ho3+

“…The crucial aspect of analyzing the optical properties of transparent glass-ceramics, ceramics, and various phosphors is the characterization of the luminescence, which results from the 4f-4f electronic transitions of rare earth ions [ 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 ]. It is worth noting that studies of ceramic samples containing trivalent holmium ions are focused on characterizing the efficient green visible emission [ 6 , 18 , 48 ].…”

Influence of Sintering Parameters on Spectroscopic Properties of BMW: Eu3+ Ceramic Materials Prepared by HPLT Technique

“…Ba 2 MgWO 6 (BMW) double perovskite is a good candidate for making transparent ceramics because it possesses desirable properties, such as cubic structure with the space group Fm−3m , the theoretical density of δ th —7.2 g/cm 3 , and most importantly, excellent compaction ability which may be related to the low friction and rearrangement forces encountered during compaction [ 1 , 2 ]. Ceramic materials have aroused great interest in recent years; therefore, many research centers are looking for ideal materials in order to obtain transparent ceramics.…”

“…Physicochemical properties of ceramics significantly exceed many other materials in terms of resistance to rapid temperature changes and the ability to work in difficult conditions (corrosive or chemical environment, high temperature, or high pressure). Importantly, the light scattering phenomenon also occurs in ceramics, but it is much smaller than in the currently used phosphors [ 1 , 2 ].…”

“…However, the literature is very poor in describing Ba 2 MgWO 6 ceramic materials with a double perovskite structure [ 1 , 2 , 3 , 4 , 5 , 6 ]. There are only a few works that mainly focus on describing their structural properties [ 3 , 4 , 5 , 6 ] and merely two [ 1 , 2 ] about the luminescent properties of these ceramic materials.…”

“…However, the literature is very poor in describing Ba 2 MgWO 6 ceramic materials with a double perovskite structure [ 1 , 2 , 3 , 4 , 5 , 6 ]. There are only a few works that mainly focus on describing their structural properties [ 3 , 4 , 5 , 6 ] and merely two [ 1 , 2 ] about the luminescent properties of these ceramic materials. In the work [ 3 ], a Ba 2 MgWO 6 ceramic was obtained by the traditional solid-state sintering to study its internal properties to elucidate the microscopic mechanism of its dielectric response.…”