Fabrication and Photoluminescence Characteristics of Eu³⁺‐Doped Lu₂O₃ Transparent Ceramics

Abstract

A novel co-precipitation process was adopted for the preparation of highly sinterable europium-doped lutetia powders using ammonium hydroxide (NH 3 . H 2 O) and ammonium hydrogen carbonate (NH 4 HCO 3 ) as the mixed precipitant. The resultant powders calcined at 10001C for 2 h showed good dispersity and excellent sinterability. Highly transparent polycrystalline lutetia ceramics with a relative density of B99.9% were fabricated by pressureless sintering in flowing H 2 atmosphere at 18501C for 6 h without any additives. The average grain sizes of the transparent material were estimated to be 50-60 lm. Optical in-line transmittance in the visible wavelength region for Lu 2 O 3 ceramics (1 mm in thickness) reached 80%. The luminescence and decay behavior of the obtained transparent plate and the corresponding nanophosphors were also investigated. J ournal

Synthesis and characterization of the crystalline powders on the basis of Lu2O3:Eu3+spherical submicron-sized particles

“…At the same time, the green density of the compacts based on agglomerated Lu 2 O 3 :Eu 3+ powders precipitated by the mixture NH 4 OH and NH 4 HCO 3 is less than 45% (pressed isostatically). 4 The compacts prepared by the cold-uniaxial pressing in this study are characterized by the relative dense random packed structures without macroscopic heterogeneities (Fig. 9b).…”

“…At the same time, the density of greenbody obtained on the basis of non-spherical particles is generally not higher than 40-45%. 4 The grain boundary mobility and the sintering ability increase for the compacts based on submicronsized particles as compared with the compacts of micrometric particles. The optimal range of diameters is 70-150 nm, since the smaller particles will be strongly subjected to agglomeration during synthesis because of its extremely high surface energy.…”

Highly transparent lutetium titanium oxide produced by spark plasma sintering

“…14 The weak absorption peaks located at 2.68 and 6.37 m might be due to O-H and C-O band stretching, respectively. 15 This kind of FTIR absorption peaks have been reported to be observed in the SPSed ceramics. 16,17 Since SPS uses a graphite die, the sintering atmosphere could contain CO and CO 2 gases.…”

Preparation of Europium-Doped Gadolinium Lutetium Oxide Solid Solution Transparent Ceramics and Its Optical Properties

“…The broad absorption peak, at 272 nm for ceramics 1, 265 nm for ceramics 2, and 285 nm for ceramics 3, resulted from the charge-transfer transitions between O and Eu [12]. The absorption peaks at 393, 465, and 533 nm of all ceramics correspond to the intraconfigurational partially forbidden transitions of 4f-4f within the Eu [13]. The transmittance of the ceramics, especially for ceramics 3, is relatively low, which is related to ceramic microstructure.…”

“…6 shows the excitation and emission spectra of the Gd Lu Eu O ceramics. The Gd Lu Eu O ceramics present the typical excitation and emission spectra of Eu [13]. The excitation spectrum with the emission wavelength at 611 nm consists of excitation peaks at 265, 306, 313, 363, 381, and 395 nm, respectively.…”