In this work, a new multifunctional nanovehicle for tumor optical imaging and therapy was developed using Y2O3:Er(3+),Yb(3+) nanoparticles as near infrared fluorescent nanophosphors, and MgAl-layered double hydroxide (LDH) nanosheets as anticancer drug nanovehicles. Monodispersed Y2O3:Er(3+),Yb(3+) nanophosphors were readily synthesized by the urea assisted homogenous precipitation method. Hier...

Single-crystal atomic-layer-deposited (ALD) Y2O3 films 2 nm thick were epitaxially grown on molecular beam epitaxy (MBE) GaAs(001)-4 ˆ 6 and GaAs(111)A-2 ˆ 2 reconstructed surfaces. The in-plane epitaxy between the ALD-oxide films and GaAs was observed using in-situ reflection high-energy electron diffraction in our uniquely designed MBE/ALD multi-chamber system. More detailed studies on the cr...

Al2O3 and Y2O3 are both very promising host materials for active integrated optics applications such as rare-earth ion doped waveguide lasers. In this paper, a reactive co-sputtering process for stable, target condition-independent deposition of Al2O3 layers with high optical quality is discussed. The loss of as-deposited Al2O3 waveguides in the near infrared wavelength range was 0.3 dB/cm. Rea...

We report a localized surface plasmon enhanced upconversion luminescence in Au/SiO2/Y2O3:Yb3+,Er3+ nanoparticles when excited at 980 nm. By adjusting the silica spacer's thickness, a maximum 9.59-fold enhancement of the green emission was obtained. Effect of the spacer distance on the Au-Y2O3:Yb3+, Er3+ green upconversion mechanism was numerically simulated and experimentally demonstrated. In t...

Y2O3 with particle sizes ranging from 5 nm to 1  μm were studied at high pressure using x-ray diffraction and Raman spectroscopy techniques. Nanometer-sized Y2O3 particles are shown to be more stable than their bulk counterparts, and a grain size-dependent crystalline-amorphous transition was discovered in these materials. High-energy atomic pair distribution function measurements reveal that t...

The influence of Eu3+ on the upconversion (UC) fluorescence of Er3+ in Y2O3:Er, Yb3+ nanocrystals was investigated. Room-temperature UC spectra show that the intensity ratio of red to green lights was increased from 8.6 to 19.3 with 1.0 mol% Eu3+ doping. Additionally, with the increase of Eu3+ ion concentration, the n values for both green and red UC emissions in Y2O3:Er, Yb3+ nanocrystals beco...

Department of Applied Chemistry, Faculty of 3-14-1 Hiyoshi, Kohoku-ku, Yokohama 223-8 [email protected]; Fax: + 81 45 566 155 † Electronic supplementary information ( undoped, 10 at% Bi-doped, and 2 a high-precision (220) XRD peaks and (2 Bi-doped, 2 at% Eu-doped, and Bi,E samples, respectively (Fig. S2); calculated Fig. S2 (Tables S1 and S2); AFM images a Y2O3 nanosheet, codoped with 10 a...

Nano-Y2O3 reinforced Ti-47.7Al-7.1Nb-(V, Cr) alloy was fabricated by a powder metallurgy route using spark plasma sintering (SPS), and the influence of nano-Y2O3 contents on microstructure mechanical properties were investigated systematically. The results revealed that ultimate tensile strength elongation 570 ± 28 MPa 1.7 0.6% at 800 °C, 460 23 6.1 0.4% 900 °C with no nano-Y2O3, 662 24 5.5 0.5...

Y2O3 ceramics containing up to 4 at.%Zn2+ were prepared by infiltrating a zinc acetate water solution into pre-sintered matrix of Y2O3. After pressureless sintering for 2 h at 1400 °C, ZnO grains dispersed in an identified. The photoluminescence (PL) spectra the Y2O3:ZnO exhibit very broad emission band over entire visible spectral range with intensity maximum about 570−590 nm. PL increases inc...

In this research Bi2O3 was doped with mixtures of 8, 10, 12 and 18 mol % of Y2O3 and Yb2O3 to stabilizing the δ-Bi2O3 phase using solid state reaction technique. Experimental samples were fabricated by isostatic pressing and sintering at 850 °C for 24 h. X-ray diffraction analysis detected cubic phase (δ-Bi2O3) as the sole stable crystalline phase in samples including 12 and 18 mol % of Y2O3 an...