Processing and Properties of Eu³⁺‐Doped Transparent YAG (Y₃Al₅O₁₂) Nanoglass–Ceramics

Abstract

An Eu3+‐doped novel mother glass in the K2O–SiO2–Y2O3–Al2O3 (KSYA) system was prepared by the melt‐quench technique. The transparent Y3Al5O12 (YAG) glass–ceramics were derived from this glass by a controlled crystallization process. The formation of YAG crystal phase, size and morphology with the progression of heat treatment was examined by X‐ray diffraction (XRD), transmission electron microscopy, field‐emission scanning electron microscopy, and Fourier transformed infrared reflectance spectroscopy. The crystallite sizes obtained from XRD are found to increase with heat‐treatment time and vary in the range of 35–45 nm. The photoluminescence spectra of Eu3+ ions exhibit emission transitions of 5D0→7Fj (j=0, 1, 2, 3, and 4) and its excitation spectra show a charge transfer band around 280 nm. From these emissions, the site symmetry in the vicinity of Eu3+ ions has been found to be Cs or lower than Cs in the nanoglass–ceramics. Absorption and fluorescence spectra reveal that the Eu3+ ions are entering into the YAG nanocrystals of the glass–ceramics. The present study indicates that the incorporation of Eu3+ ions into the YAG crystal lattice enhance the fluorescence performance of the nanoglass–ceramics. We believe that this work would generate new avenues in the exploration of YAG nanoglass–ceramics in particular and other glass–ceramics of very high‐temperature melting crystals in general.

Synthesis and Characterization of Eu3+‐Doped Transparent Glass–ceramics Containing Nanocrystalline SrIINbIVO3

“…Due to the options of wide composition variation as well as microstructure, glass–ceramics, containing high dielectric constant ceramic phases dispersed within the glass matrix, are promising candidates for the application in high‐energy storage density capacitors and electro‐optic devices . In recent years, the authors have reported rare‐earth (RE) doped various glass–ceramics containing KNbO 3 , LiTaO 3 , Y 3 Al 5 O 12 , Bi 4 Ti 3 O 12 , and SrBi 2 Ta 2 O 9 crystals for their advanced superior optical properties . Apart from these, the authors have made systematic attempts to enhance the luminescence properties of RE‐doped glass nanocomposites by the generation of metal nanoparticles …”

Upconversion emissions in YAG glass ceramics doped with Tm3+/Yb3+ ions

“…In the garnet lattice, the Y 3+ is surrounded dodecahedrally by eight oxygen atoms and the Al 3+ occupy both tetrahedral (fourfold) and octahedral (sixfold) coordination sites in a ratio of 3:2. As the closeness in radii of Tm 3+ , Yb 3+ and Y 3+ , Tm 3+ and Yb 3+ ions will substitute the Y 3+ sites in the dodecahedron [48]. Furthermore, the distinct differences between LYAS precursor glass and YAG glass ceramic fluorescence spectra shown in Fig.…”

Preparation and Luminescence Property of Red-Emitting Hardystonite Phosphors by Near-Ultraviolet Irradiation

“…The spectrum exhibits five emission peaks at 579, 591, 614, 652, and 703 nm. These five emission peaks can be attributed to the 5 D 0 → 7 F 0, 1, 2, 3, 4 transitions of Eu 3+ 36,37 . All of them consist of two main peaks centered at 591 and 614 nm, which come from the transitions of 5 D 0 → 7 F 1 and 5 D 0 → 7 F 2 , respectively.…”