Optical spectroscopy of nanocrystalline cubic Y2O3:Er3+ obtained by combustion synthesis

Capobianco, John A.; Vetrone, Fiorenzo; D'Alesio, Tania; Tessari, G.; Speghini, Adolfo; Bettinelli, Marco

doi:10.1039/b003031g

Cited by 182 publications

(131 citation statements)

References 17 publications

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“…3. Moreover, the shape and relative intensity of the luminescence bands observed in present work match with that observed in bulk and nanocrystaline Y 2 O 3 :Er +3 [9,13,31], so corresponding assignment of the bands is given in Fig. 3.…”

Section: Discussionsupporting

confidence: 68%

“…However, reducing the particle size is unlikely the reason for the disappearance of the luminescence for the samples milled more than one hour, in which the primary particles have an averaged size of 10 nm. A decrease of luminescence in nanosized c-Y 2 O 3 was reported in literature, but is explained by the adsorbed OH − (and CO 3 − ) as surface contaminants [9,31]. In our ball-milled samples no such surface adsorbents were observed because no corresponding vibration bands were recorded in RS.…”

Section: Tablementioning

confidence: 62%

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Influence of mechanochemical processing to luminescence properties in Y2O3 powder

Gajović

Tomašić

Djerdj

et al. 2008

Journal of Alloys and Compounds

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In high purity Y 2 O 3 powders presence of small amount of erbium ions in cation sites was identified due to the luminescence bands observed by Raman spectrometer. The decrease of the luminescence intensity during high-energy ball-milling was explained. The mechanochemical processing induced the changes of Y 2 O 3 microstructure introducing distortion of the crystal lattice and oxygen vacancies in the cubic phase, substitution of tungsten at the cation sites in c-Y 2 O 3 , and incomplete phase transition of Y 2 O 3 from the cubic to the monoclinic structure. The influence of the particle-size decrease, caused by ball-milling, to luminescence was also considered.Keywords: Oxide materials; Mechanochemical processing; Microstructure; Luminescence IntroductionYttrium sesquioxide (Y 2 O 3 ) ceramics have been intensively investigated for different technological purposes. For decades yttrium oxide has been an important material in ceramic industry, from constituent of ceramic superconductors [1,2], to wellknown YSZ ceramics [3,4]. Y 2 O 3 is also used in electronic applications as a part of metal-oxide-semiconductor heterostructures in MOS transistors [5][6][7][8]. It also plays an important role in preparation of novel light-emitting materials. Y 2 O3 is used as a refractory matrix in rare earth ion doped laser materials [9]. It is selected as a host because of favorable thermomechanical properties (high melting point, phase stability, low thermal expansion). A very good substitution of dopants is insured by similar crystal-chemical constraints for rare earth ions and yttrium [9,10]. Y 2 O 3 structure corresponds to the C-type cubic bixbyite structure, space group Ia3 [11,12] with 16 formula units in the elementary cell. There are 32 cation (six-fold coordinated) sites available for substitution of lanthanide ions: eight are centrosymmetric with C3i symmetry and 24 noncentrosymmetric with C 2 symmetry (Fig. 1a). The sites with C 3i symmetry have a smaller crystal field, so Stark splitting of 4f orbital is smaller [13]. Moreover, since C 3i site has an inversion center, the selection rules forbid the electron-dipole (ED) transitions, but thermal fluctuations of Y 2 O 3 lattice destroy the perfect C 3i symmetry locally [14], and the ED transitions can occur. There is no center of inversion in the C 2 site and the luminescence of incorporated lanthanide ions is predominantly connected with this site. At the pressure of 10-13 GPa cubic Y 2 O 3 exhibits the first-order reconstructive (irreversible) phase transition [15] to monoclinic structure, space group C2/m [16]. Monoclinic structure has 6 Y 2 O 3 formula units in the elementary cell with 3 nonequivalent cation sites (seven-fold coordinated) and Cs symmetry (Fig. 1b). Bihari et. al [17] observed three sets of luminescence lines in doped monoclinic Y 2 O 3 , which correspond to three nonequivalent cation sites. In this work the luminescence bands was observed in high purity Y 2 O 3 (99.99%). The origin of the luminescence bands was identified and their propert...

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Section: Discussionsupporting

confidence: 68%

Section: Tablementioning

confidence: 62%

Influence of mechanochemical processing to luminescence properties in Y2O3 powder

Gajović

Tomašić

Djerdj

et al. 2008

Journal of Alloys and Compounds

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“…In addition to the above methods, other procedures such as microwave-assisted synthesis, [73] combustion synthesis, [74] and the sonochemical synthetic route [75] have been used to prepare rare-earth-based upconverted nanocrystals. Among these synthetic techniques, the hydrothermal reaction method is the most widely used due to easy and precise control of the shapes and sizes of the upconverted nanocrystals.…”

Section: Synthesis Of Rare-earth-doped Upconverted Nanocrystalsmentioning

confidence: 99%

Lanthanide‐Doped Nanocrystals: Strategies for Improving the Efficiency of Upconversion Emission and Their Physical Understanding

2014

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The fundamental understanding of lanthanide-doped upconverted nanocrystals remains a frontier area of research because of potential applications in photonics and biophotonics. Recent studies have revealed that upconversion luminescence dynamics depend on host crystal structure, size of the nanocrystals, dopant concentration, and core-shell structures, which influence site symmetry and the distribution and energy migration of the dopant ions. In this review, we bring to light the influences of doping/co-doping concentration, crystal phase, crystal size of the host, and core-shell structure on the efficiency of upconversion emission. Furthermore, the lattice strain, due to a change in the crystal phase and by the core-shell structure, strongly influences the upconversion emission intensity. Analysis suggests that the local environment of the ion plays the most significant role in modification of radiative and nonradiative relaxation mechanisms of overall upconversion emission properties. Finally, an outlook on the prospects of this research field is given.

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“…They include solid state reaction [1], wet chemical methods such as chemical vapor deposition [2], combustion [3,4], sol-gel [5], aerosol pyrolysis [6] etc. The solid state reaction method has several shortcomings such as prolonged reaction time, larger size grain growth and poor homogeneity.…”

Section: Introductionmentioning

confidence: 99%

Thermoluminescence of combustion synthesized yttrium oxide

2012

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Pure yttrium oxide (Y 2 O 3 ) was prepared by solution combustion technique using disodium ethylene diamine tetra acetic acid (EDTA-Na 2 ) as fuel at~350°C. Powder X-ray diffraction (PXRD) pattern of Y 2 O 3 revealed cubic crystalline structure with crystallite size in the range of 18-23 nm. The scanning electron microscopy (SEM) indicated the foamy and fluffy nature of the sample. Fourier transformed infrared spectroscopy (FTIR) revealed four prominent absorption with peaks at 3395, 1433, 875 and 566 cm − 1 . From the optical absorption studies the energy gap of the synthesized sample was found to be 5.72 eV. Two well resolved thermoluminescence (TL) glows with peaks at 475 and 626 K were observed in γ-irradiated Y 2 O 3 . The glow curves were analyzed and the average activation energy was found to be 0.505 and 0.977 eV respectively.

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Optical spectroscopy of nanocrystalline cubic Y2O3:Er3+ obtained by combustion synthesis

Cited by 182 publications

References 17 publications

Influence of mechanochemical processing to luminescence properties in Y2O3 powder

Influence of mechanochemical processing to luminescence properties in Y2O3 powder

Lanthanide‐Doped Nanocrystals: Strategies for Improving the Efficiency of Upconversion Emission and Their Physical Understanding

Thermoluminescence of combustion synthesized yttrium oxide

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