Some dielectric and optical properties of ErF3-doped CaF2 crystals

Optical Characterizations of Hot‐Pressed Erbium‐Doped Calcium Fluoride Transparent Ceramic

“…It is clearly observed that the green, red, and infrared emission bands consist of several peaks. In calcium fluorite crystals containing trivalent erbium ions (Er 3+ ), the valence mismatch is usually compensated by interstitial fluoride ions (F i − ) . With the rare‐earth dopant concentration increases, evidence suggest that trivalent erbium ions aggregation occurs, forming clusters with two or more doped ions and their accompanying interstitial F ions .…”

“…With the rare‐earth dopant concentration increases, evidence suggest that trivalent erbium ions aggregation occurs, forming clusters with two or more doped ions and their accompanying interstitial F ions . In fact, many type configurations or cluster formations appear . The local structural environment of the rare earth in fluorites was observed by the extended X‐ray absorption fine structure (EXAFS) analysis .…”

“…21 In fact, many type configurations or cluster formations appear. 17,30 The local structural environment of the rare earth in fluorites was observed by the extended X-ray absorption fine structure (EXAFS) analysis. 21 Each type of configuration or cluster is corresponding to a characteristic optical luminescence spectra.…”

“…Moreover, when trivalent erbium ions are incorporated in CaF 2 matrix lattice, its relatively low phonon frequency (~322 cm −1 ) reduces the nonradiative relaxation process between adjacent energy levels, and thus a high‐efficiency upconversion and infrared emission can be obtained. Many studies on Er‐doped CaF 2 materials, such as nanopowders, single crystals, and glass‐ceramics have been reported, and Er:CaF 2 transparent ceramics were also fabricated by hot‐pressing (HP) single crystals. The purpose of this work was to demonstrate the feasibility of using nanoparticles as starting material through a hot‐pressing process to make transparent Er:CaF 2 ceramics.…”

Influence of some impurities on the emission properties of CaF2:YbF3 crystals

“…The alkaline-earth fluorides crystallize in the cubic structure and constitute an important class of relatively simple ionic crystals whose optical and lattice-dynamical properties have theoretical and experimental interest [1][2][3][4][5]. The alkaline-earth fluorides (MF 2 , M=Ca, Ba, Sr) crystals doped with rareearth (RE=La, Er, Yb, etc.)…”