ZrO2:Sm3+ nanophosphor: synthesis, Rietveld refinement, optical and thermoluminescent properties

Preparation and optical properties of samaria‐doped yttria‐stabilized zirconia single crystals

“…The intensities of the observed emission peaks were in the order 6 H 7/2 > 6 H 5/2 > 6 H 9/2 > 6 H 11/2 in all the samples; as seen in Figure , the transition 4 G 5/2 → 6 H 7/2 located at 621 nm is particularly intense. However, it should be noted that the positions of the emission peaks are appreciably different from those reported by Ponkumar et al for Sm 3+ ‐doped ZrO 2 nanophosphors (621 compared to 600 nm, 571 compared 540 nm). It is also noted that the band at 571 nm is narrow, but clearly a doublet, which probably reflects a slight variation in the energies of the 4 G 5/2 excited states.…”

“…It is also noted that the band at 571 nm is narrow, but clearly a doublet, which probably reflects a slight variation in the energies of the 4 G 5/2 excited states. This result should be contrasted with the broad asymmetric nature of this band in the measurements on nanophosphors by Ponkumar et al, which appear to show a number of peaks including appreciable intensity around 571 nm. Therefore, we hypothesize that this wavelength corresponds to transitions involving Sm 3+ in the bulk crystal, and that there is a shift in energy of the transitions for ions close to the surface.…”

“…Compared to the results reported by Gurushantha et al for nanocrystalline samples, the PL excitation spectra of Sm 3+ ‐doped YSZ single crystals have more intense and broader absorption peaks. Furthermore, the optical properties of Sm 3+ ‐doped YSZ nanophosphors, showed only one intense peak at around 405 nm, whereas the crystal samples have a series strong PLE peaks in the 325‐425 nm region, and could thus be effectively excited by diodes of different emission wavelengths in practical applications. The broad profile of the PL excitation spectrum in the 325‐425 nm region of Sm 3+ ‐doped YSZ single crystals is similar to that of the commercial n‐UV LED, and indicates that this crystal could have potential use in n‐UV LED chips.…”

“…Recent attempts to achieve highly efficient red emission have focused on the doping of materials with rare earth ions. Sm 3+ can achieve highly efficient red‐orange light emission, and high absorbance around 404 nm, which means that it can be effectively excited by an InGaN diode laser, and there are several reports of the optical properties of Sm 3+ in various matrixes, including zirconia phosphors, nanotube arrays, and films . However, to the best of our knowledge, there have been no previous reports of the properties of Sm 3+ doped into yttrium‐stabilized zirconia (YSZ) single crystals.…”

Luminescence from ZrO2 Nanopowders Doped with Sm3+ Ions Processed by Polyol Method at Low Processing Temperature

“…The control of nanoparticles size allows to modify their crystalline structure and morphology, which directly affects their electrical and optical properties. [12][13][14] ZrO 2 and ZrO 2 :RE 3þ materials have been synthesized through several routes, such as sol-gel, [1] coprecipitation process, [15] spray pyrolysis, [16] solution combustion method, [17] solvothermal synthesis, [18] polyol, [19] and plasma electrolytic oxidation, [20] among others. The polyol method, initially developed for preparation of metallic nanoparticles, has also been used for synthesis of nanopowders as oxides, phosphates, or sulfides with very satisfactory results.…”